Indication of a strange tribaryon S^+ from the ⁴He(stopped K^-,n) reaction

M. Iwasaki , T. Suzuki , H. Bhang , G. Franklin , K. Gomikawa , R.S. Hayano , T. Hayashi , K. Ishikawa

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S. Ishimoto K. Itahashi T. Katayama Y. Kondo Y. Matsuda T. Nakamura S. Okada H. Outa B.Quinn M. Sato M. Shindo H. So T. Sugimoto P. Strasser K. Suzuki S. Suzuki D. Tomono A.M. Vinodkumar E. Widmann T. Yamazaki T. Yoneyama

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classification ⚛️ nucl-ex

keywords neutronobservedreactionspectrumstoppedstrangetribaryoncharge

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We measured the neutron time-of-flight spectrum in the ^4He(stopped K^-, n) reaction by stopping negative kaons in a superfluid helium target. A clear enhancement was observed in the neutron spectrum, which indicates the formation of a strange tribaryon of charge +1 with a mass and width of M = 3141 +/- 3 (stat.) +4/-1 (sys.) MeV/c^2 and G < 23 MeV/c^2. This state, denoted as S^+(3140), is about 25 MeV/c^2 higher than the previously observed S^0(3115) T=1.

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Indication of a strange tribaryon S^+ from the ⁴He(stopped K^-,n) reaction

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