1ST IN-BEAM OBSERVATION OF AG-97 - THE 3-PROTON-HOLE SPECTRUM IN SN-100

Excited states in97Ag have been identified for the first time following the reactions46Ti(58Ni, α p 2 n and64Zn(36Ar, p 2 n. The population cross sections were 1.0(5) mb and 0.7(3) mb, respectively. The γ-decay of the seniority Ν=3 states below the Iπ=(17/2-) and (21/2+) isomers was investigated. In a search for short lived isomers half lives of t1/2=5(2) ns and 2.5(5) ns were found in the N=50 isotones97Ag, Iπ=(17/2-) and/or (21/2+) and95Rh, Iπ=(21/2+). A new isomer was identified in97Pd, Iπ=17/2+ with t1/2=2.3(5) ns. The implication of the three-proton hole spectrum in100Sn for the empirical residual interaction and shell model predictions is discussed. © 1990 Springer-Verlag.