7ΛLi ground-state spin determined by the yield of γ-rays subsequent to weak decay

Autor:	J. H. Kim, S. H. Zhou, D. Abe, T. Endo, Yukinori Sato, L. H. Zhu, H. H. Xia, Y. Fujii, Y. Kakiguchi, T. Takahashi, Y. D. Kim, H. C. Bhang, T. Murakami, Toshinobu Miyoshi, Tomofumi Nagae, H. Hotchi, S. Satoh, Michiko Sekimoto, Haruhiko Outa, Tomokazu Fukuda, H. Akikawa, K. Ozawa, Hiroyuki Noumi, L. G. Tang, R. Sawafta, K. Araki, Hiroyuki Tamura, K. Imai, Osamu Hashimoto, T. Saito, J. Sasao, K. Tanida
Rok vydání:	2004
Předmět:	Physics Nuclear and High Energy Physics γ spectroscopy Branching fraction Isotopes of lithium Mesonic decay ΛN interaction Λ hypernuclei Excited state Yield (chemistry) Bound state Gamma spectroscopy Atomic physics Ground state Spin (physics)
Zdroj:	Physics Letters B. 579(3-4):258-264
ISSN:	0370-2693
DOI:	10.1016/j.physletb.2003.11.022
Popis:	Using a large-acceptance germanium detector array (Hyperball), we measured a γ -ray spectrum in coincidence with production of 7 Λ Li bound states in the 7 Li( π + , K + ) reaction. We observed a γ -ray peak at 429 keV due to the transition from the first excited state of 7 Be produced by the weak decay of 7 Λ Li, 7 Λ Li → 7 Be ∗ (1/2 − ,429 keV )+π − . From the yield of this γ -ray, the branching ratio of the 7 Λ Li weak decay to 7 Be ∗ (429) was obtained to be (6.0 +1.3 −1.6 )×10 −2 . Compared with theoretically calculated values of the partial decay rates, the measurement indicates that the ground-state spin of 7 Λ Li is 1/2 but not 3/2.
Databáze:	OpenAIRE
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