Updated on 2021/10/21

写真a

 
SONNENSCHEIN Volker Thomas
 
Organization
Graduate School of Engineering Energy Engineering 3 Designated assistant professor
Title
Designated assistant professor

Degree 2

  1. Doctor of Philosophy in Physics ( 2015.1   University of Jyväskylä ) 

  2. Diploma in Physics ( 2008.5   University of Mainz ) 

Research Interests 1

  1. Laser spectroscopy, Radioisotopes, Trace analysis

Professional Memberships 2

  1. Japanese Society of Applied Physics

    2015.4

  2. Germany Physical Society (DPG)

    2007.1

 

Papers 83

  1. Odd-parity autoionizing levels of uranium observed by two-color two-step photoionization optogalvanic spectroscopy

    Miyabe M., Sato Y., Wakaida I, Terabayashi R., Sonnenschein V, Tomita H., Zhao Y., Sakamoto T.

    JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS   Vol. 54 ( 14 )   2021.7

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Physics B: Atomic, Molecular and Optical Physics  

    Two-color two-step photoionization optogalvanic spectroscopy was performed using high-repetition-rate titanium sapphire lasers and a uranium hollow cathode lamp to find the two-step resonance ionization schemes of uranium. Many ionization transitions were observed by exciting uranium atoms in a ground state into five, even parity, excited levels with the first-step laser and by scanning the second-step laser wavelengths. By blocking the first-step laser, single-color, two-photon ionization transitions were also identified. From these results, we have found more than 50 odd-parity autoionizing levels of uranium in the energy, ranging from the ionization potential (49958.4 cm−1) to 51 150 cm−1. The determined energy levels are within ∼±1 cm−1 of previously reported values.

    DOI: 10.1088/1361-6455/abf89f

    Web of Science

    Scopus

  2. 超高感度赤外レーザー吸収分光に基づくトリチウム分析に向けた基礎検討

    岩元 一輝, 寺林 稜平, Volker Sonnenschein, 奥山 雄貴, 齊藤 圭佑, 吉田 賢二, 西澤 典彦, 富田 英生

    アイソトープ・放射線研究発表会   Vol. 1 ( 0 )   2021

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:公益社団法人 日本アイソトープ協会  

    <p>超高感度赤外レーザー吸収分光(Cavity Ring Down Spectroscopy:CRDS)に基づく迅速・簡便かつ高感度なトリチウム分析法の開発を目指している。対象分子種として水分子を選定し、安定同位体や大気構成分子の干渉の少ないHTO倍音吸収2ν<sub>1</sub>bandの吸収線を用いることで実現される検出限界を見積もった。また、2 µm CRDSプロトタイプシステムを構築し、安定H<sub>2</sub>Oのスペクトルを取得した。</p>

    DOI: 10.50955/happyokai.1.0_92

    CiNii Article

  3. Disentangling decaying isomers and searching for signatures of collective excitations in β decay

    Guadilla V., Fallot M., Algora A., Tain J.L., Agramunt J., ystö J., Briz J.A., Cucoanes A., Eronen T., Estienne M., Fraile L.M., Ganioǧlu E., Gelletly W., Gorelov D., Hakala J., Jokinen A., Jordan D., Kankainen A., Kolhinen V., Koponen J., Lebois M., Meur L.L., Martinez T., Monserrate M., Montaner-Pizá A., Moore I., Nácher E., Orrigo S.E.A., Penttila H., Pohjalainen I., Porta A., Reinikainen J., Reponen M., Rinta-Antila S., Rubio B., Rytkönen K., Shiba T., Sonnenschein V., Sonzogni A.A., Valencia E., Vedia V., Voss A., Wilson J.N., Zakari-Issoufou A.A.

    Journal of Physics: Conference Series   Vol. 1643 ( 1 )   2020.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Physics: Conference Series  

    In this contribution we summarize the recent study of the β decay of neutron-rich nuclei with isomeric states close in energy to the ground states. The disentanglement of each pair of β-decaying states was achieved by applying different strategies and using the purification capabilities of the JYFLTRAP double Penning trap system at the Ion Guide Isotope Separator On-Line facility in Jyvaskyla. The Total Absorption γ-ray Spectroscopy technique was employed to determine the β intensity probabilities populating the excited states in the daughter nuclei. Previously undetected β intensity was found and we have already evaluated the impact of part of these results on reactor summation calculations. The possibility to populate states associated with the Pygmy Dipole Resonance in the β decay of 96gsY has also been investigated thanks to the sensitivity of our technique to high-lying strength in the daughter nuclei.

    DOI: 10.1088/1742-6596/1643/1/012134

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  4. Determination of beta-decay ground state feeding of nuclei of importance for reactor applications

    Guadilla V, Tain J. L., Algora A., Agramunt J., Jordan D., Monserrate M., Montaner-Piza A., Orrigo S. E. A., Rubio B., Valencia E., Briz J. A., Cucoanes A., Estienne M., Fallot M., Le Meur L., Porta A., Shiba T., Zakari-Issoufou A-A, Aysto J., Eronen T., Gorelov D., Hakala J., Jokinen A., Kankainen A., Kolhinen V. S., Koponen J., Moore I. D., Penttila H., Pohjalainen I, Reinikainen J., Reponen M., Rinta-Antila S., Rytkonen K., Sonnenschein V, Voss A., Fraile L. M., Vedia V., Ganioglu E., Gelletly W., Lebois M., Wilson J. N., Martinez T., Nacher E., Sonzogni A. A.

    PHYSICAL REVIEW C   Vol. 102 ( 6 )   2020.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Physical Review C  

    In β-decay studies the determination of the decay probability to the ground state (g.s.) of the daughter nucleus often suffers from large systematic errors. The difficulty of the measurement is related to the absence of associated delayed γ-ray emission. In this work we revisit the 4πγ-β method proposed by Greenwood and collaborators in the 1990s, which has the potential to overcome some of the experimental difficulties. Our interest is driven by the need to determine accurately the β-intensity distributions of fission products that contribute significantly to the reactor decay heat and to the antineutrinos emitted by reactors. A number of such decays have large g.s. branches. The method is relevant for nuclear structure studies as well. Pertinent formulas are revised and extended to the special case of β-delayed neutron emitters, and the robustness of the method is demonstrated with synthetic data. We apply it to a number of measured decays that serve as test cases and discuss the features of the method. Finally, we obtain g.s. feeding intensities with reduced uncertainty for four relevant decays that will allow future improvements in antineutrino spectrum and decay heat calculations using the summation method.

    DOI: 10.1103/PhysRevC.102.064304

    Web of Science

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  5. Mass spectral database for TOF-SIMS of stable isotopes of Sr and Zr

    Zhao Yue, Yoshida Takeru, Ohmori Yuzuka, Miyashita Yuta, Morita Masato, Sakamoto Tetsuo, Kato Kotaro, Terabayashi Ryohei, Sonnenschein Volker, Tomita Hideki, Kawai Toshihide, Okumura Takeo, Satou Yukihiko, Wakaida Ikuo, Miyabe Masabumi

    SURFACE SCIENCE SPECTRA   Vol. 27 ( 2 )   2020.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Surface Science Spectra  

    Nuclear accidents (e.g., at the Chernobyl and Fukushima Daiichi nuclear power plants) release considerable amounts of radioactive pollutants into the environment. Radioactive particles in dust and soil can range from a few micrometers to several micrometers in size. Detection of these micrometer-sized particles requires a fast and effective analytical method. Because time-of-flight secondary ion mass spectrometry (TOF-SIMS) exhibits high spatial resolution and parallel detection capability, it is suitable for analyzing micrometer-sized radioactive particles. However, due to isobaric interferences, TOF-SIMS cannot effectively distinguish between isobaric elements such as 90Sr and 90Zr. Resonant ionization sputtered neutral mass spectrometry (R-SNMS) eliminates isobaric interferences and enables the measurement of isotope ratios of isotopes approaching the detection limit. However, R-SNMS cannot be performed independently because its results are based on the TOF-SIMS spectra. This study provides a database of reference spectra for Sr and Zr stable isotopes, which can act as important reference for further analysis of radioactive particles in environmental samples.

    DOI: 10.1116/6.0000367

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  6. Mid-infrared cavity ring-down spectroscopy using DFB quantum cascade laser with optical feedback for radiocarbon detection

    Terabayashi Ryohei, Saito Keisuke, Sonnenschein Volker, Okuyama Yuki, Iguchi Testuo, Yamanaka Masahito, Nishizawa Norihiko, Yoshida Kenji, Ninomiya Shinichi, Tomita Hideki

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 59 ( 9 )   2020.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

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  7. Mid-infrared cavity ring-down spectroscopy using DFB quantum cascade laser with optical feedback for radiocarbon detection

    Terabayashi R., Saito K., Sonnenschein V., Okuyama Y., Iguchi T., Yamanaka M., Nishizawa N., Yoshida K., Ninomiya S., Tomita H.

    Japanese Journal of Applied Physics   Vol. 59 ( 9 )   2020.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japanese Journal of Applied Physics  

    A linewidth reduction of a distributed feedback quantum cascade laser (DFB-QCL) based on optical feedback for a mid-infrared (MIR) cavity ring down spectroscopy (CRDS) 14C spectrometer is presented. A cat-eye reflector as well as a path-length enhancement by a Herriott cell were employed for a compact optical setup. The laser linewidth was evaluated by monitoring the beat frequency between the DFB-QCL and a MIR optical frequency comb (OFC). The linewidth reduction by optical feedback was clearly observed although slow frequency drifts caused by environmental changes were still visible. A low-bandwidth beat-note lock to the OFC was conducted for long-term stabilization as well as for precise frequency scanning and thereby 14C measurement by MIR CRDS with optical feedback was demonstrated successfully.

    DOI: 10.35848/1347-4065/abb20e

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  8. Development of two-color resonant ionization sputtered neutral mass spectrometry and microarea imaging for Sr

    Zhao Yue, Yoshida Takeru, Ohmori Yuzuka, Miyashita Yuta, Morita Masato, Sakamoto Tetsuo, Kato Kotaro, Terabayashi Ryohei, Sonnenschein Volker, Tomita Hideki, Kawai Toshihide, Okumura Takeo, Satou Yukihiko, Miyabe Masabumi, Wakaida Ikuo

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B   Vol. 38 ( 4 )   2020.7

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics  

    Two-color resonant laser ionization sputtered neutral mass spectrometry offers high elemental selectivity. In this study, two-color resonance ionization in sputtered neutral Sr was confirmed by combining a grating type Ti:sapphire laser system and a time-of-flight secondary ion mass spectrometry (TOF-SIMS) system. The authors compared the ionization efficiencies of Sr of the two-color three-photon ionization scheme 1 (first step: 460.862 nm; second step: 767.519 nm) and the two-color two-photon ionization scheme 2 (first step: 460.862 nm; second step: 405.200 nm). The resonant ionization efficiency of the latter was found to be 50 times larger than that of the former. Finally, the authors mapped the microarea distribution of Sr by two-color resonant ionization sputtered neutral mass spectrometry.

    DOI: 10.1116/6.0000006

    Web of Science

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  9. Resonant sputtered neutral mass spectrometry using multiple reflections of laser to counterbalance Doppler broadening

    Zhao Yue, Ohmori Yuzuka, Miyashita Yuta, Morita Masato, Sakamoto Tetsuo, Kato Kotaro, Sonnenschein Volker, Tomita Hideki, Kawai Toshihide, Okumura Takeo, Satou Yukihiko, Miyabe Masabumi, Wakaida Ikuo

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B   Vol. 38 ( 3 )   2020.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics  

    Resonant laser sputtered neutral mass spectrometry can greatly enhance the ionization efficiency of specific neutral sputtered atoms through resonant excitation using tunable laser(s). However, the laser beam cannot irradiate the entire volume where sputtered particles are moving, because the laser beam is focused. In contrast, for an extremely low concentration of target elements, it is necessary to increase the laser irradiation efficiency. Irradiation efficiency depends on both spatial coverage and resonance wavelength matching. The former can be increased by increasing the laser path length within the sputtered neutral plume. The latter depends on the relationship between the laser spectral linewidth and the Doppler broadening width caused by the velocity of sputtered neutral particles. The authors have developed a new method to improve the ionization probability of neutral particles by reflecting the laser using mirrors to increase the ionization efficiency based on the concept mentioned above.

    DOI: 10.1116/6.0000012

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  10. An experimental setup for creating and imaging He-4(2)* excimer cluster tracers in superfluid helium-4 via neutron-He-3 absorption reaction

    Sonnenschein V, Tsuji Y., Kokuryu S., Kubo W., Suzuki S., Tomita H., Kiyanagi Y., Iguchi T., Matsushita T., Wada N., Kitaguchi M., Shimizu H. M., Hirota K., Shinohara T., Hiroi K., Hayashida H., Guo W., Ito D., Saito Y.

    REVIEW OF SCIENTIFIC INSTRUMENTS   Vol. 91 ( 3 )   2020.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Review of Scientific Instruments  

    For the purpose of future visualization of the flow field in superfluid helium-4, clusters of the triplet state excimer 4He2* are generated along the micro-scale recoil tracks of the neutron-absorption reaction n + 3He → 3T + p. This reaction is induced by neutron irradiation of the 3He fraction contained in natural isotopic abundance liquid helium with neutron beams either from the Japan Proton Accelerator Research Complex, Materials and Life Science Experimental Facility (JPARC)/Materials and Life Science Experimental Facility or from the Kyoto University Institute for Integrated Radiation and Nuclear Science. These 4He2* clusters are expected to be ideal tracers of the normal-fluid component in superfluid helium with several advantageous properties. Evidence of the excimer generation is inferred by detection of laser induced fluorescence emitted from the 4He2* clusters excited by a purpose-built short pulse gain-switched titanium:sapphire (Ti:sa) laser operating at a wavelength of 905 nm. The setup and performance characteristics of the laser system including the Ti:sa and two continuous wave re-pumping lasers are described. Detection at the fluorescence wavelength of 640 nm is performed by using optical bandpass filtered photomultiplier tubes (PMT). Electrical noise in the PMT acquisition traces could successfully be suppressed by post-processing with a simple algorithm. Despite other laser-related backgrounds, the excimer was clearly identified by its fluorescence decay characteristics. Production of the excimer was found to be proportional to the neutron flux, adjusted via insertion of different collimators into the neutron beam. These observations suggest that the apparatus we constructed does function in the expected manner and, therefore, has the potential for groundbreaking turbulence research with superfluid helium.

    DOI: 10.1063/1.5130919

    Web of Science

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  11. A direct diode pumped Ti:sapphire laser with single-frequency operation for high resolution spectroscopy

    Sonnenschein Volker, Tomita Hideki, Kotaro Kato, Koya Hattori, Studer Dominik, Terabayashi Ryohei, Weber Felix, Wendt Klaus, Nishizawa Norihiko, Iguchi Tetsuo

    HYPERFINE INTERACTIONS   Vol. 241 ( 1 )   2020.2

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10751-020-1706-4

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  12. A direct diode pumped continuous-wave Ti:sapphire laser as seed of a pulsed amplifier for high-resolution resonance ionization spectroscopy

    Sonnenschein V.

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   Vol. 463   page: 512 - 514   2020.1

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nimb.2019.03.017

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  13. Conceptual study on parasitic low-energy RI beam production with in-flight separator BigRIPS and the first stopping examination for high-energy RI beams in the parasitic gas cell

    Sonoda T., Katayama I., Wada M., Iimura H., Sonnenschein V., Iimura S., Takamine A., Rosenbusch M., Kojima T. M., Ahn D. S., Fukuda N., Kubo T., Nishimura S., Shimizu Y., Suzuki H., Takeda H., Tanigaki M., Tomita H., Yoshida K., Ishiyama H.

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   Vol. 2019 ( 11 )   2019.11

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/ptep/ptz120

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  14. Total absorption γ -ray spectroscopy of the β -delayed neutron emitters i 137 and Rb 95

    Guadilla V., Tain J.L., Algora A., Agramunt J., Jordan D., Monserrate M., Montaner-Pizá A., Nácher E., Orrigo S.E.A., Rubio B., Valencia E., Estienne M., Fallot M., Le Meur L., Briz J.A., Cucoanes A., Porta A., Shiba T., Zakari-Issoufou A.A., Sonzogni A.A., Äystö J., Eronen T., Gorelov D., Hakala J., Jokinen A., Kankainen A., Kolhinen V.S., Koponen J., Moore I.D., Penttilä H., Pohjalainen I., Reinikainen J., Reponen M., Rinta-Antila S., Rytkönen K., Sonnenschein V., Voss A., Fraile L.M., Vedia V., Ganioǧlu E., Gelletly W., Lebois M., Wilson J.N., Martinez T.

    Physical Review C   Vol. 100 ( 4 )   2019.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Physical Review C  

    The decays of the β-delayed neutron emitters I137 and Rb95 have been studied with the total absorption γ-ray spectroscopy technique. The purity of the beams provided by the JYFLTRAP Penning trap at the ion guide isotope separator on-line facility in Jyväskylä allowed us to carry out a campaign of isotopically pure measurements with the decay total absorption γ-ray spectrometer, a segmented detector composed of 18 NaI(Tl) modules. The contamination coming from the interaction of neutrons with the spectrometer has been carefully studied, and we have tested the use of time differences between prompt γ rays and delayed neutron interactions to eliminate this source of contamination. Due to the sensitivity of our spectrometer, we have found a significant amount of β intensity to states above the neutron separation energy that deexcite by γ rays, comparable to the neutron emission probability. The competition between γ deexcitation and neutron emission has been compared with Hauser-Feshbach calculations, and it can be understood as a nuclear structure effect. In addition, we have studied the impact of the β-intensity distributions determined in this work on reactor decay heat and reactor antineutrino spectrum summation calculations. The robustness of our results is demonstrated by a thorough study of uncertainties and with the reproduction of the spectra of the individual modules and the module-multiplicity gated spectra. This work represents the state-of-the-art of our analysis methodology for segmented total absorption spectrometers.

    DOI: 10.1103/PhysRevC.100.044305

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  15. Total absorption γ-ray spectroscopy of niobium isomers

    Guadilla V., Algora A., Tain J.L., Agramunt J., Aÿstö J., Briz J.A., Cucoanes A., Eronen T., Estienne M., Fallot M., Fraile L.M., Ganioǧlu E., Gelletly W., Gorelov D., Hakala J., Jokinen A., Jordan D., Kankainen A., Kolhinen V., Koponen J., Lebois M., Le Meur L., Martinez T., Monserrate M., Montaner-Pizá A., Moore I., Nácher E., Orrigo S.E.A., Penttilä H., Pohjalainen I., Porta A., Reinikainen J., Reponen M., Rinta-Antila S., Rubio B., Rytkönen K., Sarriguren P., Shiba T., Sonnenschein V., Sonzogni A.A., Valencia E., Vedia V., Voss A., Wilson J.N., Zakari-Issoufou A.A.

    Physical Review C   Vol. 100 ( 2 )   2019.8

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Physical Review C  

    The β-intensity distributions of the decays of Nb100gs,100m and Nb102gs,102m have been determined using the total absorption γ-ray spectroscopy technique. The JYFLTRAP double Penning trap system was employed in a campaign of challenging measurements performed with the decay total absorption γ-ray spectrometer at the Ion Guide Isotope Separator On-Line facility in Jyväskylä. Different strategies were applied to disentangle the isomeric states involved, lying very close in energy. The low-spin component of each niobium case was populated through the decay of the zirconium parent, which was treated as a contaminant. We have applied a method to extract this contamination, and additionally we have obtained β-intensity distributions for these zirconium decays. The β-strength distributions evaluated with these results were compared with calculations in a quasiparticle random-phase approximation, suggesting a prolate configuration for the ground states of Zr100,102. The footprint of the Pandemonium effect was found when comparing our results for the analyses of the niobium isotopes with previous decay data. The β-intensities of the decay of Nb102m, for which there were no previous data, were obtained. A careful evaluation of the uncertainties was carried out, and the consistency of our results was validated taking advantage of the segmentation of our spectrometer. The final results were used as input in reactor summation calculations. A large impact on antineutrino spectrum calculations was already reported, and here we detail the significant impact on decay heat calculations.

    DOI: 10.1103/PhysRevC.100.024311

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  16. Generation of He-4(2)* Clusters via Neutron-He-3 Absorption Reaction Toward Visualization of Full Velocity Field in Quantum Turbulence

    Matsushita T., Sonnenschein V., Guo W., Hayashida H., Hiroi K., Hirota K., Iguchi T., Ito D., Kitaguchi M., Kiyanagi Y., Kokuryu S., Kubo W., Saito Y., Shimizu H. M., Shinohara T., Suzuki S., Tomita H., Tsuji Y., Wada N.

    JOURNAL OF LOW TEMPERATURE PHYSICS   Vol. 196 ( 1-2 ) page: 275 - 282   2019.7

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10909-018-02112-3

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  17. Large Impact of the Decay of Niobium Isomers on the Reactor ν e Summation Calculations

    Guadilla V., Algora A., Tain J.L., Estienne M., Fallot M., Sonzogni A.A., Agramunt J., Äystö J., Briz J.A., Cucoanes A., Eronen T., Fraile L.M., Ganioǧlu E., Gelletly W., Gorelov D., Hakala J., Jokinen A., Jordan D., Kankainen A., Kolhinen V., Koponen J., Lebois M., Le Meur L., Martinez T., Monserrate M., Montaner-Pizá A., Moore I., Nácher E., Orrigo S.E.A., Penttilä H., Pohjalainen I., Porta A., Reinikainen J., Reponen M., Rinta-Antila S., Rubio B., Rytkönen K., Shiba T., Sonnenschein V., Valencia E., Vedia V., Voss A., Wilson J.N., Zakari-Issoufou A.A.

    Physical Review Letters   Vol. 122 ( 4 )   2019

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Physical Review Letters  

    Even mass neutron-rich niobium isotopes are among the principal contributors to the reactor antineutrino energy spectrum. They are also among the most challenging to measure due to the refractory nature of niobium, and because they exhibit isomeric states lying very close in energy. The β-intensity distributions of Nb100gs,100m and Nb102gs,102m β decays have been determined using the total absorption γ-ray spectroscopy technique. The measurements were performed at the upgraded Ion Guide Isotope Separator On-Line facility at the University of Jyväskylä. Here, the double Penning trap system JYFLTRAP was employed to disentangle the β decay of the isomeric states. The new data obtained in this challenging measurement have a large impact in antineutrino summation calculations. For the first time the discrepancy between the summation model and the reactor antineutrino measurements in the region of the shape distortion has been reduced.

    DOI: 10.1103/PhysRevLett.122.042502

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  18. Characterization and performance of the DTAS detector

    Guadilla V.

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   Vol. 910   page: 79 - 89   2018.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nima.2018.09.001

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  19. Towards in-jet resonance ionization spectroscopy: An injection-locked Titanium:Sapphire laser system for the PALIS-facility

    Reponen M., Sonnenschein V., Sonoda T., Tomita H., Oohashi M., Matsui D., Wada M.

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 908   page: 236 - 243   2018.11

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nima.2018.08.073

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  20. Isotope-selective Microscale Imaging of Radioactive Cs without Isobaric Interferences using Sputtered Neutral Mass Spectrometry with Two-step Resonant Ionization using newly-developed Ti:Sapphire Lasers

    SAKAMOTO Tetsuo, KAWAI Toshihide, OKUMURA Takeo, SATOU Yukihiko, WAKAIDA Ikuo, MORITA Masato, KANENARI Keita, TOMITA Hideki, SONNENSCHEIN Volker, SAITO Kosuke, OHASHI Masaya, KATO Kotaro, IGUCHI Tetsuo

    Analytical Sciences   Vol. 34 ( 11 ) page: 1265 - 1270   2018.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2116/analsci.18P249

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  21. Isotope-selective Microscale Imaging of Radioactive Cs without Isobaric Interferences Using Sputtered Neutral Mass Spectrometry with Two-step Resonant Ionization Employing Newly-developed Ti:Sapphire Lasers

    Sakamoto Tetsuo, Morita Masato, Kanenari Keita, Tomita Hideki, Sonnenschein Volker, Saito Kosuke, Ohashi Masaya, Kato Kotaro, Iguon Tetsuo, Kawai Toshihide, Okumura Takeo, Satou Yukihiko, Wakaida Ikuo

    ANALYTICAL SCIENCES   Vol. 34 ( 11 ) page: 1265-1270   2018.11

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  22. Yb-doped Fiber Laser Based Coherent Mid-Infrared Frequency Comb at λ = 4.5 μm for CRDS application

    Jin L., Sonnenschein V., Terabayashi R., Hayashi N., Kato S., Yamanaka M., Tomita H., Iguchi T., Sato A., Nozawa K., Yoshida K., Nishizawa N.

    2018 Conference on Lasers and Electro-Optics, CLEO 2018 - Proceedings     2018.8

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:2018 Conference on Lasers and Electro-Optics, CLEO 2018 - Proceedings  

    An offset free mid-infrared optical frequency comb was generated based on an Yb-doped fiber laser system with tunability of 3.9-4.7 μm. Cavity ring down spectroscopy measurement was demonstrated with QCL and MIR comb reference.

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  23. A cavity ring-down spectrometer for study of biomedical radiocarbon-labeled samples

    Sonnenschein Volker, Terabayashi Ryohei, Tomita Hideki, Kato Shusuke, Hayashi Noriyoshi, Takeda Shin, Jin Lei, Yamanaka Masahito, Nishizawa Norihiko, Sato Atsushi, Yoshida Kenji, Iguchi Tetsuo

    JOURNAL OF APPLIED PHYSICS   Vol. 124 ( 3 )   2018.7

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.5041015

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  24. The laser and optical system for the RIBF-PALIS experiment

    Sonoda T., Iimura H., Reponen M., Wada M., Katayama I., Sonnenschein V., Takamatsu T., Tomita H., Kojima T. M.

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 877   page: 118 - 123   2018.1

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nima.2017.09.055

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  25. 3.1-5.2 mu m Coherent MIR Frequency Comb Based on Yb-Doped Fiber Laser

    Jin Lei, Sonnenschein Volker, Yamanaka Masahito, Tomita Hideki, Iguchi Tetsuo, Sato Atsushi, Nozawa Kohei, Yoshida Kenji, Ninomiya Shin-Ichi, Nishizawa Norihiko

    IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS   Vol. 24 ( 3 )   2018

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    DOI: 10.1109/JSTQE.2017.2759258

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  26. Development of Analytical Method for <sup>14</sup>C Determination in Biomedical Sample by Laser Spectroscopy

    Terabayashi Ryohei, Nozawa Kohei, Hashizume Kenta, Iguchi Tetsuo, Sonnenschein Volker, Tomita Hideki, Sato Atsushi, Hayashi Noriyoshi, Kato Shusuke, Jin Lei, Yamanaka Masahito, Nishizawa Norihiko

    RADIOISOTOPES   Vol. 67 ( 3 ) page: 85-91   2018

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    <p>In recent years, new method called "microdose study" has been developed to directly investigate pharmacokinetics in the human body using a limited amount of <sup>14</sup>C labeled candidate compounds which is less than 100 µg or 1% of the dose that yields pharmacological effects. Drug development costs are expected to be dramatically decreased by this new method. Since the required abundance sensitivity of <sup>14</sup>C analysis in the microdose studies is 10<sup>−10</sup>–10<sup>−12</sup>, Accelerator Mass Spectrometry (AMS) is presently used for this purpose. However, the high cost and limited throughput in <sup>14</sup>C analysis by AMS may prevent from wide expansion of the microdose studies to drug development. As an alternative method, we are developing <sup>14</sup>C detection system based on Cavity Ring-Down Spectroscopy (CRDS) for microdose studies.</p>

    DOI: 10.3769/radioisotopes.67.85

    CiNii Article

  27. Yb-doped Fiber Laser Based Coherent Mid-Infrared Frequency Comb at lambda=4.5 mu m for CRDS application

    Jin L., Sonnenschein V., Terabayashi R., Hayashi N., Kato S., Yamanaka M., Tomita H., Iguchi T., Sato A., Nozawa K., Yoshida K., Nishizawa N.

    2018 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)     2018

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  28. Yb-doped fiber laser based coherent mid-infrared frequency comb at λ= 4.5 μm for CRDS application

    Jin L., Sonnenschein V., Terabayashi R., Hayashi N., Kato S., Yamanaka M., Tomita H., Iguchi T., Sato A., Nozawa K., Yoshida K., Nishizawa N.

    Optics InfoBase Conference Papers   Vol. Part F94-CLEO_SI 2018   2018

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    An offset free mid-infrared optical frequency comb was generated based on an Ybdoped fiber laser system with tunability of 3.9-4.7 μm. Cavity ring down spectroscopy measurement was demonstrated with QCL and MIR comb reference.

    DOI: 10.1364/CLEO_SI.2018.STh4K.4

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  29. In-gas laser ionization and spectroscopy of actinium isotopes near the N=126 closed shell

    Granados C.

    Physical Review C   Vol. 96 ( 5 )   2017.11

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    DOI: 10.1103/PhysRevC.96.054331

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  30. Laser spectroscopy with an electrostatic ConeTrap

    Kelly S.

    Hyperfine Interactions   Vol. 238 ( 1 )   2017.11

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    DOI: 10.1007/s10751-017-1412-z

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  31. Strong γ-ray emission from neutron unbound states populated in β-decay: Impact on (n,γ) cross-section estimates

    Tain J.L., Guadilla V., Valencia E., Algora A., Zakari-Issoufou A.A., Rice S., Meur L.L., Agramunt J., Äystö J., Batist L., Bowry M., Briz J.A., Bui V.M., Caballero-Folch R., Cano-Ott D., Cucoanes A., Elomaa V.V., Eronen T., Estevez E., Estienne M., Fallot M., Farrelly G.F., Fraile L.M., Ganioglu E., Garcia A.R., Gelletly W., Gómez-Hornillos B., Gorelov D., Gorlychev V., Hakala J., Jokinen A., Jordan M.D., Kankainen A., Kolhinen V.S., Kondev F.G., Koponen J., Lebois M., Martínez T., Mason P., Mendoza E., Monserrate M., Montaner-Pizá A., Moore I., Nacher E., Orrigo S.E.A., Penttilä H., Podolyák Z., Pohjalainen I., Porta A., Regan P.H., Reinikainen J., Reponen M., Rinta-Antila S., Rissanen J., Rubio B., Rytkönen K., Shiba T., Sonnenschein V., Sonzogni A.A., Vedia V., Voss A., Wilson J.N.

    EPJ Web of Conferences   Vol. 146   2017.9

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    Total absorption gamma-ray spectroscopy is used to measure accurately the intensity of γ emission from neutron-unbound states populated in the β-decay of delayed-neutron emitters. From the comparison of this intensity with the intensity of neutron emission one can deduce information on the (n,γ) cross section for unstable neutron-rich nuclei of interest in r process abundance calculations. A surprisingly large γ branching was observed for a number of isotopes. The results are compared with Hauser-Feshbach calculations and discussed.

    DOI: 10.1051/epjconf/201714601002

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  32. TAGS measurements of <sup>100</sup>Nb ground and isomeric states and <sup>140</sup>Cs for neutrino physics with the new DTAS detector

    Guadilla V., Algora A., Tain J.L., Agramunt J., Äystö J., Briz J.A., Cucoanes A., Eronen T., Estienne M., Fallot M., Fraile L.M., Ganioǧlu E., Gelletly W., Gorelov D., Hakala J., Jokinen A., Jordan D., Kankainen A., Kolhinen V., Koponen J., Lebois M., Martinez T., Monserrate M., Montaner-Pizá A., Moore I., Nácher E., Orrigo S.E.A., Penttilä H., Pohjalainen I., Porta A., Reinikainen J., Reponen M., Rinta-Antila S., Rubio B., Rytkönen K., Shiba T., Sonnenschein V., Sonzogni A.A., Valencia E., Vedia V., Voss A., Wilson J.N., Zakari-Issoufou A.A.

    EPJ Web of Conferences   Vol. 146   2017.9

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    In this work we report on total absorption γ-ray spectroscopy measurements of the β decay of fission products that are important contributors to the antineutrino spectrum. The experiment was performed at IGISOL as a part of a campaign of measurements with the new DTAS spectrometer. Preliminary results of the analysis of the β decay of 100Nb,100mNb and 140Cs are presented.

    DOI: 10.1051/epjconf/201714610010

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  33. Total absorption spectroscopy of fission fragments relevant for reactor antineutrino spectra

    Fallot M., Porta A., Meur L.L., Briz J.A., Zakari-Issoufou A.A., Guadilla V., Algora A., Taìn J.L., Valencia E., Rice S., Bui V.M., Cormon S., Estienne M., Agramunt J., Äystö J., Batist L., Bowry M., Caballero-Folch R., Cano-Ott D., Cucoanes A., Elomaa V.V., Eronen T., Estévez E., Farrelly G.F., Fraile L.M., Fleming M., Ganogliu E., Garcia A.R., Gelletly W., Gomez-Hornillos M.B., Gorelov D., Gorlychev V., Hakala J., Jokinen A., Jordan M.D., Kankainen A., Karvonen P., Kolhinen V.S., Kondev F.G., Koponen J., Lebois M., Martinez T., Mason P., Mendoza E., Molina F., Monserrate M., Montaner-Pizá A., Moore I., Nácher E., Orrigo S.E.A., Penttilä H., Perez A., Podolyák Z., Pohjalainen I., Regan P.H., Reinikainen J., Reponen M., Rinta-Antila S., Rissanen J., Rubio B., Shiba T., Sonnenschein V., Sonzogni A.A., Sublet J.C., Vedia V., Voss A., Weber C., Wilson J.N.

    EPJ Web of Conferences   Vol. 146   2017.9

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    The accurate determination of reactor antineutrino spectra remains a very active research topic for which new methods of study have emerged in recent years. Indeed, following the long-recognized reactor anomaly (measured antineutrino deficit in short baseline reactor experiments when compared with spectral predictions), the three international reactor neutrino experiments Double Chooz, Daya Bay and Reno have recently demonstrated the existence of spectral distortions in their measurements with respect to the same predictions. These spectral predictions were obtained through the conversion of integral beta-energy spectra obtained at the ILL research reactor. Several studies have shown that the underlying nuclear physics required for the conversion of these spectra into antineutrino spectra is not totally understood. An alternative to such converted spectra is a complementary approach that consists of determining the antineutrino spectrum by means of the measurement and processing of nuclear data. The beta properties of some key fission products suffer from the pandemonium effect which can be circumvented by the use of the Total Absorption Gammaray Spectroscopy technique (TAGS). The two main contributors to the PressurizedWater Reactor antineutrino spectrum in the region where the spectral distortion has been observed are 92Rb and 142Cs, which have been measured at the radioactive beam facility of the University of Jyvaskyla in two TAGS experiments.We present the results of the analysis of the TAGS measurements of the β-decay properties of 92Rb along with preliminary results on 142Cs and report on the measurements already performed.

    DOI: 10.1051/epjconf/201714610002

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  34. Total absorption studies of high priority decays for reactor applications: <sup>86</sup>Br and <sup>91</sup>Rb

    Algora A., Rice S., Guadilla V., Tain J.L., Valencia E., Zakari-Issoufou A.A., Agramunt J., Äystö J., Batist L., Briz J.A., Bowry M., Bui V.M., Caballero-Folch R., Cano-Ott D., Cucoanes A., Eronen T., Elomaa V.V., Estevez E., Estienne M., Fallot M., Farrelly G.F., Fraile L.M., Fleming M., Ganioglu E., Garcia A.R., Gelletly W., Gómez-Hornillos B., Gorelov D., Gorlychev V., Hakala J., Jokinen A., Jordan D., Kankainen A., Kolhinen V.S., Kondev F.G., Koponen J., Lebois M., Martinez T., Mason P., Mendoza E., Monserrate M., Montaner-Pizá A., Moore I., Nácher E., Orrigo S.E.A., Penttilä H., Podolyák Z., Pohjalainen I., Porta A., Regan P.H., Reinikainen J., Reponen M., Rinta-Antila S., Rissanen J., Rubio B., Rytkönen K., Shiba T., Sonnenschein V., Sonzogni A.A., Sublet J.C., Vedia V., Voss A., Wilson J.N.

    EPJ Web of Conferences   Vol. 146   2017.9

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    Preliminary results from beta decay studies of nuclei that are important for reactor applications are presented. The beta decays have been studied using the total absorption technique (TAS) and the pure beams provided by the JYFLTRAP system at the IGISOL facility of the University of Jyvaskyla.

    DOI: 10.1051/epjconf/201714610001

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  35. Characterization of a pulsed injection-locked Ti:sapphire laser and its application to high resolution resonance ionization spectroscopy of copper

    Sonnenschein V., Moore I. D., Raeder S., Reponen M., Tomita H., Wendt K.

    LASER PHYSICS   Vol. 27 ( 8 )   2017.8

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    DOI: 10.1088/1555-6611/aa7834

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  36. Experimental study of Tc 100 β decay with total absorption γ -ray spectroscopy

    Guadilla V., Algora A., Tain J.L., Agramunt J., Jordan D., Montaner-Pizá A., Orrigo S.E.A., Rubio B., Valencia E., Suhonen J., Civitarese O., Äystö J., Briz J.A., Cucoanes A., Eronen T., Estienne M., Fallot M., Fraile L.M., Ganioǧlu E., Gelletly W., Gorelov D., Hakala J., Jokinen A., Kankainen A., Kolhinen V., Koponen J., Lebois M., Martinez T., Monserrate M., Moore I., Nácher E., Penttilä H., Pohjalainen I., Porta A., Reinikainen J., Reponen M., Rinta-Antila S., Rytkönen K., Shiba T., Sonnenschein V., Sonzogni A.A., Vedia V., Voss A., Wilson J.N., Zakari-Issoufou A.A.

    Physical Review C   Vol. 96 ( 1 )   2017.7

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    The β decay of Tc100 has been studied by using the total absorption γ-ray spectroscopy technique at the Ion Guide Isotope Separator On-Line facility in Jyväskylä. In this work the new Decay Total Absorption γ-ray Spectrometer in coincidence with a cylindrical plastic β detector has been employed. The β intensity to the ground state obtained from the analysis is in good agreement with previous high-resolution measurements. However, differences in the feeding to the first-excited state as well as weak feeding to a new level at high excitation energy have been deduced from this experiment. Theoretical calculations performed in the quasiparticle random-phase approximation framework are also reported. Comparison of these calculations with our measurement serves as a benchmark for calculations of the double β decay of Mo100.

    DOI: 10.1103/PhysRevC.96.014319

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  37. Total absorption spectroscopy study of the β decay of Br 86 and Rb 91

    Rice S., Algora A., Tain J.L., Valencia E., Agramunt J., Rubio B., Gelletly W., Regan P.H., Zakari-Issoufou A.A., Fallot M., Porta A., Rissanen J., Eronen T., Äystö J., Batist L., Bowry M., Bui V.M., Caballero-Folch R., Cano-Ott D., Elomaa V.V., Estevez E., Farrelly G.F., Garcia A.R., Gomez-Hornillos B., Gorlychev V., Hakala J., Jordan M.D., Jokinen A., Kolhinen V.S., Kondev F.G., Martínez T., Mason P., Mendoza E., Moore I., Penttilä H., Podolyák Z., Reponen M., Sonnenschein V., Sonzogni A.A., Sarriguren P.

    Physical Review C   Vol. 96 ( 1 )   2017.7

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    The beta decays of Br86 and Rb91 have been studied using the total absorption spectroscopy technique. The radioactive nuclei were produced at the Ion Guide Isotope Separator On-Line facility in Jyväskylä and further purified using the JYFLTRAP. Br86 and Rb91 are considered to be major contributors to the decay heat in reactors. In addition, Rb91 was used as a normalization point in direct measurements of mean gamma energies released in the beta decay of fission products by Rudstam et al. assuming that this decay was well known from high-resolution measurements. Our results show that both decays were suffering from the Pandemonium effect and that the results of Rudstam et al. should be renormalized. The relative impact of the studied decays in the prediction of the decay heat and antineutrino spectrum from reactors has been evaluated.

    DOI: 10.1103/PhysRevC.96.014320

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  38. Characterization of a cylindrical plastic β-detector with Monte Carlo simulations of optical photons

    Guadilla V., Algora A., Tain J.L., Agramunt J., Äystö J., Briz J.A., Cucoanes A., Eronen T., Estienne M., Fallot M., Fraile L.M., Ganioğlu E., Gelletly W., Gorelov D., Hakala J., Jokinen A., Jordan D., Kankainen A., Kolhinen V., Koponen J., Lebois M., Martinez T., Monserrate M., Montaner-Pizá A., Moore I., Nácher E., Orrigo S.E.A., Penttilä H., Pohjalainen I., Porta A., Reinikainen J., Reponen M., Rinta-Antila S., Rubio B., Rytkönen K., Shiba T., Sonnenschein V., Valencia E., Vedia V., Voss A., Wilson J.N., Zakari-Issoufou A.A.

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   Vol. 854   page: 134 - 138   2017.5

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    In this work we report on the Monte Carlo study performed to understand and reproduce experimental measurements of a new plastic β-detector with cylindrical geometry. Since energy deposition simulations differ from the experimental measurements for such a geometry, we show how the simulation of production and transport of optical photons does allow one to obtain the shapes of the experimental spectra. Moreover, taking into account the computational effort associated with this kind of simulation, we develop a method to convert the simulations of energy deposited into light collected, depending only on the interaction point in the detector. This method represents a useful solution when extensive simulations have to be done, as in the case of the calculation of the response function of the spectrometer in a total absorption γ-ray spectroscopy analysis.

    DOI: 10.1016/j.nima.2017.02.047

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  39. High-resolution laser spectroscopy of long-lived plutonium isotopes

    Voss A., Sonnenschein V., Campbell P., Cheal B., Kron T., Moore I. D., Pohjalainen I., Raeder S., Trautmann N., Wendt K.

    PHYSICAL REVIEW A   Vol. 95 ( 3 )   2017.3

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    DOI: 10.1103/PhysRevA.95.032506

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  40. Efficient, high-resolution resonance laser ionization spectroscopy using weak transitions to long-lived excited states

    De Groote R.

    Physical Review A   Vol. 95 ( 3 )   2017.3

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    DOI: 10.1103/PhysRevA.95.032502

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  41. Study of the β decay of fission products with the dtas detector

    Guadilla V., Algora A., Tain J.L., Agramunt J., Äystö J., Briz J.A., Cucoanes A., Eronen T., Estienne M., Fallot M., Fraile L.M., Ganioglu E., Gelletly W., Gorelov D., Hakala J., Jokinen A., Jordan D., Kankainen A., Kolhinen V., Koponen J., Lebois M., Martinez T., Monserrate M., Montaner-Pizá A., Moore I., Nácher E., Orrigo S.E.A., Penttilä H., Pohjalainen I., Porta A., Reinikainen J., Reponen M., Rinta-Antila S., Rubio B., Rytkönen K., Shiba T., Sonnenschein V., Sonzogni A.A., Valencia E., Vedia V., Voss A., Wilson J.N., Zakari-Issoufou A.A.

    Acta Physica Polonica B   Vol. 48 ( 3 ) page: 529 - 532   2017.3

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    Total Absorption Spectroscopy measurements of the β decay of 103Mo and 103Tc, important contributors to the decay heat summation calculation in reactors, are reported in this work. The analysis of the experiment, performed at IGISOL with the new DTAS detector, show new β intensity that was not detected in previous measurements with Ge detectors.

    DOI: 10.5506/APhysPolB.48.529

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  42. Towards high-resolution laser ionization spectroscopy of the heaviest elements in supersonic gas jet expansion

    Ferrer R.

    Nature Communications   Vol. 8   2017.2

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    DOI: 10.1038/ncomms14520

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  43. Total absorption γ -ray spectroscopy of the β -delayed neutron emitters Br 87, Br 88, and Rb 94

    Valencia E., Tain J.L., Algora A., Agramunt J., Estevez E., Jordan M.D., Rubio B., Rice S., Regan P., Gelletly W., Podolyák Z., Bowry M., Mason P., Farrelly G.F., Zakari-Issoufou A., Fallot M., Porta A., Bui V.M., Rissanen J., Eronen T., Moore I., Penttilä H., Äystö J., Elomaa V.V., Hakala J., Jokinen A., Kolhinen V.S., Reponen M., Sonnenschein V., Cano-Ott D., Garcia A.R., Martínez T., Mendoza E., Caballero-Folch R., Gomez-Hornillos B., Gorlichev V., Kondev F.G., Sonzogni A.A., Batist L.

    Physical Review C   Vol. 95 ( 2 )   2017.2

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    We investigate the decay of Br87,88 and Rb94 using total absorption γ-ray spectroscopy. These important fission products are β-delayed neutron emitters. Our data show considerable βγ intensity, so far unobserved in high-resolution γ-ray spectroscopy, from states at high excitation energy. We also find significant differences with the β intensity that can be deduced from existing measurements of the β spectrum. We evaluate the impact of the present data on reactor decay heat using summation calculations. Although the effect is relatively small it helps to reduce the discrepancy between calculations and integral measurements of the photon component for U235 fission at cooling times in the range 1-100 s. We also use summation calculations to evaluate the impact of present data on reactor antineutrino spectra. We find a significant effect at antineutrino energies in the range of 5 to 9 MeV. In addition, we observe an unexpected strong probability for γ emission from neutron unbound states populated in the daughter nucleus. The γ branching is compared to Hauser-Feshbach calculations, which allow one to explain the large value for bromine isotopes as due to nuclear structure. However the branching for Rb94, although much smaller, hints of the need to increase the radiative width Γγ by one order of magnitude. This increase in Γγ would lead to a similar increase in the calculated (n,γ) cross section for this very neutron-rich nucleus with a potential impact on r process abundance calculations.

    DOI: 10.1103/PhysRevC.95.024320

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  44. Highly coherent tunable mid-infrared frequency comb pumped by supercontinuum at 1 mu m

    Jin Lei, Yamanaka Masahito, Sonnenschein Volker, Tomita Hideki, Iguchi Tetsuo, Sato Atsushi, Oh-hara Toshinari, Nishizawa Norihiko

    APPLIED PHYSICS EXPRESS   Vol. 10 ( 1 )   2017.1

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    DOI: 10.7567/APEX.10.012503

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  45. 4.4-5.2 mu m Wavelength Tunable, Coherent MIR Frequency Comb Generation Based on Yb-doped Fiber Laser

    Jin Lei, Yamanaka Masahito, Sonnenschein Volker, Tomita Hideki, Iguchi Tetsuo, Sato Atsushi, Ideno Akira, Oh-hara Toshinari, Nishizawa Norihiko

    2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)     page: .   2017

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  46. Coherent mid-infrared optical frequency comb working at 4.52 μm based on Yb-doped fiber laser

    Jin L., Sonnenschein V., Yamanaka M., Tomita H., Iguchi T., Sato A., Ideno A., Oh-hara T., Nishizawa N.

    Optics InfoBase Conference Papers   Vol. Part F75-ASSL 2017   2017

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    Offset free mid-infrared optical frequency comb at 4.52 μm was generated through DFG pumped by Yb-doped fiber laser system. Narrow RF beat between MIR comb and quantum cascade laser was observed with high SNR.

    DOI: 10.1364/ASSL.2017.AW1A.2

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  47. Optical feedback in dfb quantum cascade laser for mid-infrared cavity ring-down spectroscopy

    Terabayashi Ryohei, Sonnenschein Volker, Tomita Hideki, Hayashi Noriyoshi, Kato Shusuke, Jin Lei, Yamanaka Masahito, Nishizawa Norihiko, Sato Atsushi, Nozawa Kohei, Hashizume Kenta, Oh-Hara Toshinari, Iguchi Tetsuo

    HYPERFINE INTERACTIONS   Vol. 238 ( 1 )   2016.12

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    DOI: 10.1007/s10751-016-1390-6

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  48. Development of a saturated absorption spectroscopy setup at IGISOL for characterisation of Fabry-Perot interferometers

    Geldhof S., El Youbi S., Moore I. D., Pohjalainen I., Sonnenschein V., Terabayashi R., Voss A.

    HYPERFINE INTERACTIONS   Vol. 238 ( 1 )   2016.12

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    DOI: 10.1007/s10751-016-1385-3

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  49. Developments towards in-gas-jet laser spectroscopy studies of actinium isotopes at LISOL

    Raeder S.

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   Vol. 376   page: 382 - 387   2016.6

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    DOI: 10.1016/j.nimb.2015.12.014

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  50. In-gas-cell laser ionization studies of plutonium isotopes at IGISOL

    Pohjalainen I., Moore I. D., Kron T., Raeder S., Sonnenschein V., Tomita H., Trautmann N., Voss A., Wendt K.

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS   Vol. 376   page: 233 - 239   2016.6

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    DOI: 10.1016/j.nimb.2016.02.019

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  51. First experiment with the NUSTAR/FAIR Decay Total Absorption γ-Ray Spectrometer (DTAS) at the IGISOL IV facility

    Guadilla V., Algora A., Tain J.L., Agramunt J., Äystö J., Briz J.A., Cano-Ott D., Cucoanes A., Eronen T., Estienne M., Fallot M., Fraile L.M., Ganioglu E., Gelletly W., Gorelov D., Hakala J., Jokinen A., Jordan D., Kankainen A., Kolhinen V., Koponen J., Lebois M., Martinez T., Monserrate M., Montaner-Pizá A., Moore I., Nácher E., Orrigo S., Penttilä H., Podolyak Z., Pohjalainen I., Porta A., Regan P., Reinikainen J., Reponen M., Rinta-Antila S., Rubio B., Rytkönen K., Shiba T., Sonnenschein V., Sonzogni A.A., Valencia E., Vedia V., Voss A., Wilson J.N., Zakari-Issoufou A.A.

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   Vol. 376   page: 334 - 337   2016.6

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    The new Decay Total Absorption Spectrometer (DTAS) has been commissioned with low energy radioactive beams at the upgraded IGISOL IV facility. The DTAS is a segmented detector composed of up to 18 NaI(Tl) crystals and it will be a key instrument in the DESPEC experiment at FAIR. In this document we report on the experimental setup and the first measurements performed with DTAS at IGISOL. The detector was characterized by means of MC simulations, and this allowed us to calculate the response function of the spectrometer and analyse the first cases of interest.

    DOI: 10.1016/j.nimb.2015.12.018

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  52. Development of High Resolution Resonance Ionization Mass Spectrometry for Neutron Dosimetry Technique with Nb-93(n, n')Nb-93m Reaction

    Tomita Hideki, Takatsuka Takaaki, Takamatsu Takahide, Adachi Yoshitaka, Furuta Yujin, Noto Takuma, Iguchi Tetsuo, Sonnenschein Volker, Wendt Klaus, Ito Chikara, Maeda Shigetaka

    ISRD 15 - INTERNATIONAL SYMPOSIUM ON REACTOR DOSIMETRY   Vol. 106   2016

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    DOI: 10.1051/epjconf/201610605002

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  53. An inductively heated hot cavity catcher laser ion source

    Reponen M., Moore I. D., Pohjalainen I., Rothe S., Savonen M., Sonnenschein V., Voss A.

    REVIEW OF SCIENTIFIC INSTRUMENTS   Vol. 86 ( 12 )   2015.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.4936569

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  54. Erratum to: “Measuring independent yields of fission products using a penning trap” [Bulletin of the Russian Academy of Sciences: Physics, (2015), 79, (869) DOI 10.3103/S1062873815070114]

    Gorelov D., Eronen T., Hakala J., Jokinen A., Kankainen A., Kolhinen V., Lantz M., Mattera A., Moore I., Penttilä H., Pohjalainen I., Pomp S., Reponen M., Rinta-Antila S., Rubchenya V., Saastamoinen A., Simutkin V., Solders A., Sonnenschein V., Äystö J.

    Bulletin of the Russian Academy of Sciences: Physics   Vol. 79 ( 10 )   2015.10

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    DOI: 10.3103/S1062873815150010

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  55. Enhanced γ -Ray Emission from Neutron Unbound States Populated in β Decay

    Tain J.L., Valencia E., Algora A., Agramunt J., Rubio B., Rice S., Gelletly W., Regan P., Zakari-Issoufou A.A., Fallot M., Porta A., Rissanen J., Eronen T., Äystö J., Batist L., Bowry M., Bui V.M., Caballero-Folch R., Cano-Ott D., Elomaa V.V., Estevez E., Farrelly G.F., Garcia A.R., Gomez-Hornillos B., Gorlychev V., Hakala J., Jordan M.D., Jokinen A., Kolhinen V.S., Kondev F.G., Martínez T., Mendoza E., Moore I., Penttilä H., Podolyák Z., Reponen M., Sonnenschein V., Sonzogni A.A.

    Physical Review Letters   Vol. 115 ( 6 )   2015.8

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    Total absorption spectroscopy is used to investigate the β-decay intensity to states above the neutron separation energy followed by γ-ray emission in Br87,88 and Rb94. Accurate results are obtained thanks to a careful control of systematic errors. An unexpectedly large γ intensity is observed in all three cases extending well beyond the excitation energy region where neutron penetration is hindered by low neutron energy. The γ branching as a function of excitation energy is compared to Hauser-Feshbach model calculations. For Br87 and Br88 the γ branching reaches 57% and 20%, respectively, and could be explained as a nuclear structure effect. Some of the states populated in the daughter can only decay through the emission of a large orbital angular momentum neutron with a strongly reduced barrier penetrability. In the case of neutron-rich Rb94 the observed 4.5% branching is much larger than the calculations performed with standard nuclear statistical model parameters, even after proper correction for fluctuation effects on individual transition widths. The difference can be reconciled by introducing an enhancement of 1 order of magnitude in the photon strength to neutron strength ratio. An increase in the photon strength function of such magnitude for very neutron-rich nuclei, if it proves to be correct, leads to a similar increase in the (n,γ) cross section that would have an impact on r process abundance calculations.

    DOI: 10.1103/PhysRevLett.115.062502

    Scopus

  56. Measuring independent yields of fission products using a penning trap

    Gorelov D.

    Bulletin of the Russian Academy of Sciences: Physics   Vol. 79 ( 7 ) page: 869 - 871   2015.7

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    DOI: 10.3103/S1062873815070114

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  57. 27pSH-11 A narrowband injection-locked Titanium : Sapphire laser system for precision laser resonance ionization spectroscopy at the SLOWRIPALIS-facility

    Reponen M., Sonoda T., Wada M., Sonnenschein V., Tomita H.

      Vol. 70 ( 0 )   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_321

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  58. Characterization of a dual-etalon Ti:Sapphire laser via resonance ionization spectroscopy of stable copper isotopes

    Sonnenschein V.

    Hyperfine Interactions   Vol. 227 ( 1-3 ) page: 113 - 123   2014.6

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    DOI: 10.1007/s10751-013-1000-9

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  59. Laser spectroscopy at IGISOL IV

    Dicker A.

    Hyperfine Interactions   Vol. 227 ( 1-3 ) page: 139 - 145   2014.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10751-013-0997-0

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  60. Total Absorption Study of Beta Decays Relevant for Nuclear Applications and Nuclear Structure

    Algora A.

    Nuclear Data Sheets   Vol. 120   page: 12 - 15   2014.6

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    DOI: 10.1016/j.nds.2014.06.129

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  61. Coulomb displacement energies as a probe for nucleon pairing in the f7/2 shell

    Kankainen A.

    Physical Review C - Nuclear Physics   Vol. 89 ( 5 )   2014.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevC.89.051302

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  62. Isomeric yield ratios of fission products measured with the jyfltrap

    Gorelov D., Hakala J., Jokinen A., Kolhinen V., Koponen J., Moore I., Penttilä H., Pohjalainen I., Reponen M., Rinta-Antila S., Sonnenschein V., Voss A., Al-Adili A., Lantz M., Mattera A., Pomp S., Rakopoulos V., Simutkin V., Solders A., Äystö J.

    Acta Physica Polonica B   Vol. 45 ( 2 ) page: 211 - 216   2014.2

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    Experimental methods to determine isomeric yield ratios usually apply -spectroscopic techniques. In such methods, ground and isomeric statesare distinguished by their decays. In the present work, several isomeric yield ratios of fission products have been measured by utilizing capabilities of the double Penning-trap mass spectrometer JYFLTRAP, where isomeric and ground state were separated by their masses. To verify the new experimental technique, the results were compared to those from -spectroscopy measurements.

    DOI: 10.5506/APhysPolB.45.211

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  63. Development of resonance ionization in a supersonic gas-jet for studies of short-lived and long-lived radioactive nuclei

    Takatsuka Takaaki, Tomita Hideki, Sonnenschein Volker, Sonoda Tetsu, Adachi Yoshitaka, Sakamoto Chika, Mita Hiroki, Noto Takuma, Ito Chikara, Maeda Shigetaka, Iguchi Tetsuo, Wada Michiharu, Wendt Klaus, Moore Iain

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS   Vol. 317 ( PART B ) page: 586 - 589   2013.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nimb.2013.05.054

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  64. Recommissioning of JYFLTRAP at the new IGISOL-4 facility

    Kolhinen V.

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   Vol. 317 ( PART B ) page: 506 - 509   2013.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nimb.2013.07.050

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  65. Towards commissioning the new IGISOL-4 facility

    Moore I.

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   Vol. 317 ( PART B ) page: 208 - 213   2013.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nimb.2013.06.036

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  66. The FURIOS laser ion source at IGISOL-4

    Reponen M.

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   Vol. 317 ( PART B ) page: 422 - 425   2013.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nimb.2013.05.061

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  67. Development of high resolution resonance ionization mass spectrometry for trace analysis of Nb-93m

    Takatsuka Takaaki, Tomita Hideki, Sonoda Tetsu, Sonnenschein Volker, Sakamoto Chika, Mita Hiroki, Noto Takuma, Ito Chikara, Maeda Shigetaka, Iguchi Tetsuo, Wada Michiharu, Wendt Klaus, Moore Iain

    HYPERFINE INTERACTIONS   Vol. 216 ( 1-3 ) page: 41 - 46   2013.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10751-013-0824-7

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  68. Isotope-selective laser photodetachment for I-129 accelerator mass spectrometry

    Takahashi Tone, Tomita Hideki, Nakayama Motoi, Adachi Yoshitaka, Sonnenschein Volker, Iguchi Tetsuo, Wendt Klaus

    HYPERFINE INTERACTIONS   Vol. 216 ( 1-3 ) page: 133 - 138   2013.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10751-013-0766-0

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  69. Control of RILIS lasers at IGISOL facilities using a compact atomic beam reference cell

    Kron T., Ferrer-Garcia R., Lecesne N., Sonnenschein V., Raeder S., Rossnagel J., Wendt K.

    Hyperfine Interactions   Vol. 216 ( 1-3 ) page: 53 - 58   2013.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Hyperfine Interactions  

    The choice and proper operation of the laser systems for laser ion sources at on-line facilities using multi-step resonance ionization processes is the basis for production of intense and pure radioactive ion beams. These pave the way for numerous fundamental studies in nuclear and astrophysics. A comparison between systems of medium or high repetition rate pulsed tunable lasers based on dyes or crystals as active medium has been carried out at the IGISOL facility at Louvain-la-Neuve. The importance of properly controlling the operation conditions of the individual lasers via a reference atomic beam chamber is highlighted and design and implementation of such a compact device for permanent monitoring as well as possible regulation of the various laser parameters of relevance is discussed. © 2013 Springer Science+Business Media Dordrecht.

    DOI: 10.1007/s10751-012-0756-7

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  70. Isomeric states close to doubly magic 132Sn studied with the double Penning trap JYFLTRAP

    Kankainen A.

    Physical Review C - Nuclear Physics   Vol. 87 ( 2 )   2013.2

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevC.87.024307

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  71. Recent mass measurements for the r process at JYFLTRAP

    Kankainen A., Eronen T., Gorelov D., Hakala J., Jokinen A., Kolhinen V., Moore I., Penttilä H., Rinta-Antila S., Rissanen J., Saastamoinen A., Sonnenschein V., Äystö J.

    Proceedings of Science     2012.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Proceedings of Science  

    This contribution gives an overview of recent mass measurements performed in the 132Sn region relevant for the r-process studies. The atomic masses of 121-128Cd, 129,131In, 130-135Sn, 131-136Sb, and 132-140Te have been measured with the JYFLTRAP double Penning trap mass spectrometer. Among these, the masses of four r-process nuclei - 135Sn, 136Sb, 139Te, and 140Te - have been experimentally determined for the first time. In addition, the masses of the (11/2-) isomers in 121,123,125Cd and 133Te, (1/2-) isomers in 129,131In, and (7-) isomers in 130Sn and 134Sb have been measured and corresponding excitation energies have been determined. The ground-state mass values have been compared to recent Atomic Mass Evaluations and deviations have been found in particular for the states based on beta-decay energies. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

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  72. Performance of a high repetition pulse rate laser system for in-gas-jet laser ionization studies with the Leuven laser ion source @ LISOL

    Ferrer R.

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   Vol. 291   page: 29 - 37   2012.11

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nimb.2012.08.023

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  73. Determination of the ground-state hyperfine structure in neutral <sup>229</sup>Th

    Sonnenschein V.

    Journal of Physics B: Atomic, Molecular and Optical Physics   Vol. 45 ( 16 )   2012.8

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    DOI: 10.1088/0953-4075/45/16/165005

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  74. Precision mass measurements beyond Sn132: Anomalous behavior of odd-even staggering of binding energies

    Hakala J.

    Physical Review Letters   Vol. 109 ( 3 )   2012.7

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevLett.109.032501

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  75. Determination of the ground state hyperfine structure in neutral 229Th Reviewed

    V. Sonnenschein, S. Raeder, A. Hakimi, I.D. Moore, K. Wendt

    J. Phys. B: At. Mol. Opt. Phys.   Vol. 45   page: 165005   2012.7

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  76. Laser developments and resonance ionization spectroscopy at IGISOL

    Reponen M.

    European Physical Journal A   Vol. 48 ( 4 ) page: 1 - 15   2012

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    DOI: 10.1140/epja/i2012-12045-2

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  77. The search for the existence of <sup>229m</sup>Th at IGISOL

    Sonnenschein V.

    European Physical Journal A   Vol. 48 ( 4 ) page: 1 - 15   2012

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1140/epja/i2012-12052-3

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  78. Development of Trace Analysis of <SUP>93m</SUP>Nb by Resonance Ionization Mass Spectrometry in Gas-jet toward Neutron Dosimetry:(1)Resonance Ionization Mass Spectroscopy on Nb by Ti:Sapphire Laser

    Sakamoto Chika, Maeda Shigetaka, Iguchi Tetsuo, Wada Michiharu, Klaus Wendt, Iain Moore, Takatsuka Takaaki, Volker Sonnenschein, Tomita Hideki, Sonoda Tetsu, Mita Kouki, Noto Takuma, Adachi Yoshitaka, Ito Chikara

    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan   Vol. 2012 ( 0 )   2012

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Atomic Energy Society of Japan  

    DOI: 10.11561/aesj.2012f.0.92.0

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  79. Development of Trace Analysis of <SUP>93m</SUP>Nb by Resonance Ionization Mass Spectrometry in Gas-jet toward Neutron Dosimetry:(2)Development of Gas-jet Atomic Source for Trace Analysis of <SUP>93m</SUP>Nb

    Takatsuka Takaaki, Maeda Shigetaka, Iguchi Tetsuo, Wada Michiharu, Klaus Wendt, Iain Moore, Sakamoto Chika, Volker Sonnenschein, Tomita Hideki, Sonoda Tetsu, Mita Kouki, Noto Takuma, Adachi Yoshitaka, Ito Chikara

    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan   Vol. 2012 ( 0 )   2012

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Atomic Energy Society of Japan  

    DOI: 10.11561/aesj.2012f.0.93.0

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  80. Resonance ionization spectroscopy of thorium isotopes-towards a laser spectroscopic identification of the low-lying 7.6 eV isomer of<sup>229</sup>Th

    Raeder S.

    Journal of Physics B: Atomic, Molecular and Optical Physics   Vol. 44 ( 16 )   2011.8

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    DOI: 10.1088/0953-4075/44/16/165005

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  81. The possibilities of the extended IGISOL facility at JYFL

    Journal of the Korean Physical Society   Vol. 59 ( 23 ) page: 1589 - 1592   2011.8

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    DOI: 10.3938/jkps.59.1589

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  82. High-precision mass measurement of S31 with the double Penning trap JYFLTRAP improves the mass value for Cl32

    Kankainen A.

    Physical Review C - Nuclear Physics   Vol. 82 ( 5 )   2010.11

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevC.82.052501

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  83. Production of negative osmium ions by laser desorption and ionization

    Review of Scientific Instruments   Vol. 81 ( 1 )   2010.2

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.3276685

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Presentations 9

  1. Yb-doped fiber laser based coherent mid-infrared frequency comb at λ= 4.5 μm for CRDS application

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    Event date: 2018

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.1364/CLEO_SI.2018.STh4K.4

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  2. 4-5.2 m wavelength tunable, coherent MIR frequency comb generation based on Yb-doped fiber laser

    Jin L.

    2017 Conference on Lasers and Electro-Optics, CLEO 2017 - Proceedings 

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    Event date: 2017.10

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.1364/CLEO_SI.2017.STu1K.4

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  3. Strong γ-ray emission from neutron unbound states populated in β-decay: Impact on (n,γ) cross-section estimates

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.1051/epjconf/201714601002

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  4. Total absorption spectroscopy of fission fragments relevant for reactor antineutrino spectra

    Fallot M.

    EPJ Web of Conferences 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.1051/epjconf/201714610002

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  5. TAGS measurements of <sup>100</sup>Nb ground and isomeric states and <sup>140</sup>Cs for neutrino physics with the new DTAS detector

    Guadilla V.

    EPJ Web of Conferences 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.1051/epjconf/201714610010

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  6. Total absorption studies of high priority decays for reactor applications: <sup>86</sup>Br and <sup>91</sup>Rb

    Algora A.

    EPJ Web of Conferences 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.1051/epjconf/201714610001

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  7. Study of the β decay of fission products with the dtas detector

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    Event date: 2017.3

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.5506/APhysPolB.48.529

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  8. Coherent mid-infrared optical frequency comb working at 4.52 μm based on Yb-doped fiber laser

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    Event date: 2017

    Language:English   Presentation type:Oral presentation (general)  

    DOI: 10.1364/ASSL.2017.AW1A.2

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  9. Recent mass measurements for the r process at JYFLTRAP

    Kankainen A.

    Proceedings of Science 

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    Event date: 2012.12

    Language:English   Presentation type:Oral presentation (general)  

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KAKENHI (Grants-in-Aid for Scientific Research) 1

  1. 生体内代謝物解析のためのレーザー分光に基づく放射性炭素同位体分析法の開発

    Grant number:18H03469  2018.4 - 2021.3

    科学研究費助成事業  基盤研究(B)

    富田 英生, 古川 高子, 山本 誠一, 寺林 稜平, SONNENSCH Volker

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    Authorship:Coinvestigator(s) 

 

Teaching Experience (On-campus) 3

  1. Mathematics II and Tutorial

    2021

     詳細を見る

    Supervision of self-study mathematics exercises and explanation of solutions as well as correcting and grading of homework problems

  2. Mathematics II and Tutorial

    2019

     詳細を見る

    Supervision of self-study mathematics exercises and explanation of solutions for G30 students, as well as correcting and grading homework problems.

  3. Radiation measurement A

    2017

     詳細を見る

    Supervision of practical student experiments related to measurements of sealed radioactive sources using Germanium detectors

 

Academic Activities 1

  1. Guest editor of Special issue of Applied Sciences Journal International contribution

    Role(s):Supervision (editorial)

    MDPI journals  2021.6 - 2022.4