High-resolution gamma-ray spectroscopy of 7Λli

H. Tamura, K. Tanida, D. Abe, H. Akikawa, K. Araki, H. Bhang, T. Endo, Y. Fujii, T. Fukuda, O. Hashimoto, K. Imai, H. Hotchi, Y. Kakiguchi, J. H. Kim, Y. D. Kim, T. Miyoshi, T. Murakami, T. Nagae, J. Nishida, H. NoumiH. Outa, K. Ozawa, T. Saito, J. Sasao, Y. Sato, S. Satoh, R. Sawafta, M. Sekimoto, T. Takahashi, L. Tang, H. H. Xia, S. H. Zhou, L. H. Zhu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We report on the first observation of hypernuclear γ transitions using germanium detectors. Using a large-acceptance Ge detector system, we observed two γ transitions in 7ΛLi, the spin-flip M1(3/2+→1/2+) transition at 689±4 keV and the E2(5/2+→1/2+) transition at 2050±2 keV (preliminary). The strength of the ΛN spin-spin interaction is derived from the energy of the former transition. As for the latter transition, B(E2) was measured to be 3.9±0.6±0.4 e2fm4 (preliminary), which indicates a shrinkage of the nuclear size of 7ΛLi from 6Li and confirms "glue-like role" of Λ.

Original languageEnglish
Pages (from-to)249-256
Number of pages8
JournalNuclear Physics A
Issue number1-4
Publication statusPublished - 2000 May 8

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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