/ nucl-ex arXiv:1508.00376

Observation of Spin-Dependent Charge Symmetry Breaking in $\Lambda N$ Interaction: Gamma-Ray Spectroscopy of $^4_{\Lambda }$He

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.) ; Hayakawa, T. (Osaka U.) ; Honda, R. (Osaka U.) ; 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.) ; Marcello, S. (Turin U.) ; Miwa, K. (Tohoku U.) ; Moon, T. (Seoul Natl. U.) ; Nagae, T. (Kyoto U.) ; Nagao, S. (Tohoku U.) ; Nakada, Y. (Osaka U.) ; Nakagawa, M. (Osaka U.) ; Ogura, Y. (Tohoku U.) ; Sakaguchi, A. (Osaka U.) ; Sako, H. (JAEA, Ibaraki) ; Sasaki, Y. (Tohoku U.) ; Sato, S. (JAEA, Ibaraki) ; Shiozaki, T. (Tohoku U.) ; Shirotori, K. (Osaka U.) ; Sugimura, H. (JAEA, Ibaraki) ; Suto, S. (Tohoku U.) ; Suzuki, S. (KEK, Tsukuba) ; Takahashi, T. (KEK, Tsukuba) ; Tamura, H. (Tohoku U.) ; Tanabe, K. (Tohoku U.) ; Tanida, K. (JAEA, Ibaraki) ; Tsamalaidze, Z. (Dubna, JINR) ; Ukai, M. (Tohoku U.) ; Yamamoto, Y. (Tohoku U.) ; Yang, S.B. (Seoul Natl. U.)

Abstract: The energy spacing between the ground-state spin doublet of $^4_\Lambda $He(1$^+$,0$^+$) was determined to be $1406 \pm 2 \pm 2$ keV, by measuring $\gamma$ rays for the $1^+ \to 0^+$ transition with a high efficiency germanium detector array in coincidence with the $^4$He$(K^-,\pi^-)$ $^4_\Lambda $He reaction at J-PARC. In comparison to the corresponding energy spacing in the mirror hypernucleus $^4_\Lambda $H, the present result clearly indicates the existence of charge symmetry breaking (CSB) in $\Lambda N$ interaction. It is also found that the CSB effect is large in the $0^+$ ground state but is by one order of magnitude smaller in the $1^+$ excited state, demonstrating that the $\Lambda N$ CSB interaction has spin dependence.

Web-Page: http://inspirehep.net/record/1386300/files/HeMissMass3.png; http://inspirehep.net/record/1386300/files/Fit4.png; http://inspirehep.net/record/1386300/files/HeMirror.png; http://inspirehep.net/record/1386300/files/AroundHBJ2.png; http://inspirehep.net/record/1386300/files/HeGateGamma2.png; http://inspirehep.net/record/1386300/files/arXiv:1508.00376.pdf

Note: *Brief entry*; *Temporary entry*

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