TY - JOUR
T1 - Evidence for a bound state of the Σ4 He hypernucleus
AU - Hayano, R. S.
AU - Ishikawa, T.
AU - Iwasaki, M.
AU - Outa, H.
AU - Takada, E.
AU - Tamura, H.
AU - Sakaguchi, A.
AU - Aoki, M.
AU - Yamazaki, T.
N1 - Funding Information:
Wc would like to thank Professor Y. Akaishi tbr stimulating discussions. Mr. T. Motoki for his contribution in target preparation, and the KEK PS staffin the execution of this experiment. This work is supported in part by the Grant-in-Aid for Special Project Research on Meson Science of the Japan Ministry of Education, Science and Culture. One of the authors (H.T.) acknowledges the support of the (h'ant-in-Aid for Encouragement of Young Scientists.
PY - 1989/11/16
Y1 - 1989/11/16
N2 - We report data which imply the existence of a Σ-nucleus bound state, formed in a (K-, π-) reaction at rest on a 4He target. A peak was found, which we attribute to the formation of the Σ4He ground state, corresponding to ΔM≡M(4ΣHe)-M(4He)=267 .7±0.3 (statistical) -0.1+1.1 (systematic) MeV (BΣ+=3.2 MeV. The width of the peak was deduced to be 4.6±0.5 (statiscal) +1.6-1.3 (systematic) MeV. No clear peak was found in the corresponding region of the (K-, π+) spectrum. We assign I= 1 2 and S=0 to this state.
AB - We report data which imply the existence of a Σ-nucleus bound state, formed in a (K-, π-) reaction at rest on a 4He target. A peak was found, which we attribute to the formation of the Σ4He ground state, corresponding to ΔM≡M(4ΣHe)-M(4He)=267 .7±0.3 (statistical) -0.1+1.1 (systematic) MeV (BΣ+=3.2 MeV. The width of the peak was deduced to be 4.6±0.5 (statiscal) +1.6-1.3 (systematic) MeV. No clear peak was found in the corresponding region of the (K-, π+) spectrum. We assign I= 1 2 and S=0 to this state.
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U2 - 10.1016/0370-2693(89)90675-8
DO - 10.1016/0370-2693(89)90675-8
M3 - Article
AN - SCOPUS:0010056357
SN - 0370-2693
VL - 231
SP - 355
EP - 358
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 4
ER -