Observation of a γ\gamma transition in the _lambda4\_{lambda}^{4}H hyper-nucleus

The γ spectra induced by stopped K − mesons in a 7 Li target were obtained in coincidence with the accompanying charged pions. A thorough analysis of these spectra indicates that the observed 1.09 MeV line can be ascribed to a γ transition in the 4 Λ H hypernucleus

Further investigation of the γ{\gamma}-transitions in Λ4^{4}_{\Lambda}H and Λ4^{4}_{\Lambda}He hypernuclei

The gamma -spectra induced by stopped K/sup -/ mesons in /sup 6/Li and /sup 7/Li targets were obtained in coincidence with the accompanying charged pions and pi /sup 0/ mesons. The gamma -line at (1.04+or-0.04) MeV observed with charged pions was identified as a gamma -transition in /sub Lambda //sup 4/H, whereas the gamma -line at (1.15+or-0.04) Me V observed with pi /sup 0/ mesons was ascribed to a gamma -transition in /sub Lambda //sup 4/He. Using these new values for the excitation energies of the 1/sup +/ levels of /sub Lambda //sup 4/H and /sub Lambda //sup 4/He hypernuclei, the phenomenological Lambda N potential for the s-state interaction was recalculated. (9 refs)