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.
ASJC Scopus subject areas
- Nuclear and High Energy Physics