/ Experiment-Nucl

Gamma-ray Spectroscopy of Hypernuclei — Recent Results and Prospect at J-PARC —

Tamura, H. (Tohoku U.) ; Yamamoto, T.O. (Tohoku U.) ; Agnello, M. (INFN, Turin) ; Akazawa, Y. (Tohoku U.) ; Amano, N. (Kyoto U.) ; Aoki, K. (KEK, Tsukuba) ; Botta, E. (Turin U.) ; Chiga, N. (Tohoku U.) ; Ekawa, H. (Kyoto U.) ; Evtoukhovitch, P. (Dubna, JINR) ; Feliciello, A. (INFN, Turin) ; Fujita, M. (Tohoku U.) ; Gogami, T. (Kyoto U.) ; Hasegawa, S. (JAEA, Ibaraki) ; Hayakawa, S.H. (Osaka U., Inst. Phys.) ; Hayakawa, T. (Osaka U., Inst. Phys.) ; Honda, R. (Osaka U., Inst. Phys.) ; Hosomi, K. (JAEA, Ibaraki) ; Hwang, S.H. (JAEA, Ibaraki) ; Ichige, N. (Tohoku U.) ; Ichikawa, Y. (JAEA, Ibaraki) ; Ikeda, M. (Tohoku U.) ; Imai, K. (JAEA, Ibaraki) ; Ishimoto, S. (KEK, Tsukuba) ; Kanatsuki, S. (Kyoto U.) ; Kim, M.H. (Korea U.) ; Kim, S.H. (Korea U.) ; Kinbara, S. (Gifu U.) ; Koike, T. (Tohoku U.) ; Lee, J.Y. (Seoul Natl. U., Dept. Phys. Astron.) ; Marcello, S. (Turin U.) ; Miwa, K. (Tohoku U.) ; Moon, T. (Seoul Natl. U., Dept. Phys. Astron.) ; Nagae, T. (Kyoto U.) ; Nagao, S. (Tohoku U.) ; Nakada, Y. (Osaka U., Inst. Phys.) ; Nakagawa, M. (Osaka U., Inst. Phys.) ; Ogura, Y. (Tohoku U.) ; Sakaguchi, A. (Osaka U., Inst. Phys.) ; Sako, H. (JAEA, Ibaraki) ; Sasaki, Y. (Tohoku U.) ; Sato, S. (JAEA, Ibaraki) ; Shiozaki, T. (Tohoku U.) ; Shirotori, K. (Osaka U., Res. Ctr. Nucl. Phys.) ; Sugimura, H. (JAEA, Ibaraki) ; Suto, S. (Tohoku U.) ; Suzuki, S. (KEK, Tsukuba) ; Takahashi, T. (KEK, Tsukuba) ; Tanabe, K. (Tohoku U.) ; Tanida, K. (JAEA, Ibaraki) ; Tsamalaidze, Z. (Dubna, JINR) ; Ukai, M. (Tohoku U.)

Published in: JPS Conf.Proc.
Year: 2017
Vol.: 17
Page No: 011004
Pages: 11
Year: 2017 published

Abstract: The present status and future prospects of precision γ-ray spectroscopy of Λ hypernuclei are described. A new experiment (J-PARC E13) has been performed at the J-PARC K1.8 line employing a newly-developed germanium (Ge) detector array, Hyperball-J, via the (K^−, π^−) reaction on ^4He and ^19F targets. This is the first study of s-shell and sd-shell Λ hypernuclei with Ge detectors. The ^4He target spectrum exhibited a γ-ray peak of \(_{\Lambda }^{4}\text{He}\)(1^+ → 0^+) at 1.406 ± 0.002 ± 0.002 MeV. Compared with the energy (1.09 ± 0.02 MeV) of the corresponding transition for the mirror hypernucleus, \(_{\Lambda }^{4}\text{H}\)(1^+ → 0^+), the present result clearly indicates a large charge symmetry breaking (CSB) effect. This decisive data for CSB allows a stringent test of baryon-baryon interaction models. As for the ^19F target run, a preliminary spectrum shows several γ-ray peaks assigned to \(_{\Lambda }^{19}\text{F}\) transitions. Future plans of γ-ray spectroscopy are also discussed.

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DOI: 10.7566/JPSCP.17.011004
 Record created 2017-08-01, last modified 2017-08-01

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