Abstract
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 Λ 7Li, the spin-flip M1( 3 2 +→ 1 2 +) transition at 689±4keV 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 e 2fm 4 (preliminary), which indicates a shrinkage of the nuclear size of Λ 7Li from 6Li and confirms “glue-like role” of Λ.
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