研究者詳細 - 北口　雅暁

論文 - 北口　雅暁

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Direct Measurement of the Transverse Coherence Length of Cold Neutron Beam 査読有り

Masaaki Kitaguchi, Haruhiko Funahashi, Terunao Nakura, Masahiro Hino, Hirohiko M. Shimizu

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 72 巻頁： 38 - 41 2003年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PHYSICAL SOC JAPAN

We have developed new cold-neutron interferometer of Jamin-type. Clear interference fringes with the contrast of 60% were observed. This is the first success of neutron interferometer using four independent multilayer mirrors. By using this new interferometer, we have measured the transverse coherence length of cold neutron beam directly. The transverse dislocation between the two paths can be controlled with no dispersion. The measured coherence length was consistent with the estimate given by the transverse momentum distribution of incident beam.

DOI： 10.1143/JPSJS.72SC.38

Web of Science

Measurement of invariant mass spectra of vector meson decaying in nuclear matter 査読有り

M Naruki, J Chiba, H En'yo, H Funahashi, H Hamagaki, M Ieiri, M Ishino, H Kanda, M Kitaguchi, S Mihara, T Miyashita, T Murakami, R Muto, M Nomachi, K Ozawa, F Sakuma, O Sasaki, HD Sato, M Sekimoto, T Tabaru, KH Tanaka, S Yadama, S Yokkaichi, Y Yoshimura

NUCLEAR PHYSICS A 721 巻頁： 297C - 300C 2003年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

The experiment E325 has been performed at KEK PS. The data taking has been completed on February 2002. We have measured the invariant mass spectrum of e(+)e(-)pairs based on the statistics 100 times larger than our previous publication[3]. On the low-mass side of rho/omega meson, an enhancement over the known hadronic sources has been observed. The obtained rho/omega ratio in the spectrum is smaller than the ratio in pp interaction. This suggests that rho meson mass has been modified in nuclear matter.

DOI： 10.1016/S0375-9474(03)01054-6

Web of Science

Cold-neutron interferometer of the Jamin type 査読有り

M Kitaguchi, H Funahashi, T Nakura, M Hino, HM Shimizu

PHYSICAL REVIEW A 67 巻 ( 3 ) 頁： 033609 2003年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMERICAN PHYSICAL SOC

A cold-neutron interferometer using four independent multilayer mirrors is demonstrated. We have observed interference fringes with a contrast of 60%. The interferometer is based on a pair of devices using etalons with an air gap of 9.75 mum in spacing. The optical system is equivalent to the Jamin-type interferometer, which allows much larger spatial separation between the two coherent beams than the previous type of multilayer interferometer to broaden the applicability of neutron interferometry.

DOI： 10.1103/PhysRevA.67.033609

Web of Science

Measurement of invariant mass spectra of vector meson decaying in nuclear matter at KEK-PS 査読有り

R Muto, J Chiba, H En'yo, Y Fukao, H Funahashi, H Hamagaki, M Ieiri, M Ishino, H Kanda, M Kitaguchi, A Mihara, K Miwa, T Miyashita, T Murakami, T Nakura, M Naruki, M Nomachi, K Ozawa, F Sakuma, O Sasaki, M Sekimoto, T Tabaru, KH Tanaka, M Togawa, S Yamada, S Yokkaichi, Y Yoshimura

INTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS 698 巻頁： 138 - 141 2003年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：AMER INST PHYSICS

We measured invariant mass spectra of e(+)e(-) pairs produced in 12-GeV p + A interaction to investigate in-medium mass modification of vector mesons. We observed the excess over the known hadronic sources below the omega meson mass peak. The obtained rho/omega ratio and velocity dependence of excess/omega ratio imply that this excess mainly results from p meson whose miss was modified in nuclear matter.

Web of Science

Direct measurement of the transverse coherence length of cold neutron beam

M.Kitaguchi, H.Funahashi, T.Nakura, K.Taketani, M.Hino, H.M.Shimizu

Activity report on neutron scattering research 10 巻頁： 259 - 0 2003年

Novel interferometer for cold neutrons using a pair of etalons 査読有り

M. Kitaguchi, H. Funahashi, T. Nakura, M. Hino, H.M. Shimizu

Nuclear Physics A 721 巻頁： 481c-484c 2003年

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