Observation of hypernuclear fine structure in Λ16O

M. Ukai, O. Hashimoto, Y. Miura, T. Miyoshi, K. Mizunuma, S. N. Nakamura, Y. Okayasu, H. Tamura, S. Ajimura, T. Kishimoto, T. Hayakawa, S. Minami, H. Akikawa, K. Imai, H. Takahashi, D. E. Alburger, R. E. Chrien, H. Hotchi, M. May, P. PileA. Rusek, R. Sutter, T. Nagae, Y. Sato, A. Banu, G. B. Franklin, B. P. Quinn, J. Franz, K. Nakazawa, K. Tanida, L. Tang, L. Yuan

Research output: Contribution to journalArticlepeer-review


We observed two γ-ray transitions of Λ16O in the 16O(K-, π- γ) reaction using a germanium detector array, Hyperball. The γ rays are assigned as the M1 transitions from the 6 MeV excited state (1-) to the ground state doublet (1-, 0-). The energies of the γ rays are 6534.1 ± 1.5 keV and 6560.2 ± 1.3 keV, and the energy spacing is 26.1 ± 2.0 keV, which corresponds to the ground state doublet spacing. From their yield ratio of 0.65±0.11/N (6560)), the spin order of the ground state doublet is determined. This result gives a small value for the ΛN tensor force strength.

Original languageEnglish
Pages (from-to)70-74
Number of pages5
JournalNuclear Physics A
Issue number1-4 SPEC. ISS.
Publication statusPublished - 2005 May 30

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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