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18 March 2025

» arxiv » 1508.0376

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Observation of Spin-Dependent Charge Symmetry Breaking in $Lambda N$ Interaction: Gamma-Ray Spectroscopy of $^4_{Lambda }$He
T. O. Yamamoto ; M. Agnello ; Y. Akazawa ; N. Amano ; K. Aoki ; E. Botta ; N. Chiga ; H. Ekawa ; P. Evtoukhovitch ; A. Feliciello ; M. Fujita ; T. Gogami ; S. Hasegawa ; S. H. Hayakawa ; T. Hayakawa ; R. Honda ; K. Hosomi ; S .H. Hwang ; N. Ichige ; Y. Ichikawa ; M. Ikeda ; K. Imai ; S. Ishimoto ; S. Kanatsuki ; M. H. Kim ; S. H. Kim ; S. Kinbara ; T. Koike ; J .Y. Lee ; S. Marcello ; K. Miwa ; T. Moon ; T. Nagae ; S. Nagao ; Y. Nakada ; M. Nakagawa ; Y. Ogura ; A. Sakaguchi ; H. Sako ; Y. Sasaki ; S. Sato ; T. Shiozaki ; K. Shirotori ; H. Sugimura ; S. Suto ; S. Suzuki ; T. Takahashi ; H. Tamura ; K. Tanabe ; K. Tanida ; Z. Tsamalaidze ; M. Ukai ; Y. Yamamoto ; S. B. Yang ;
Date:	3 Aug 2015
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 $1^+ o 0^+$ 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.
Source:	arXiv, 1508.0376
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