Abstract
Using methods of in-beam spectroscopy in connection with 35 MeV7Li bombardment of82Se targets four new isomers have been identified. They are observed in83Br at 3070 keV (T1/2=0.6±0.2 μs), in85Rb at 2826 keV (T1/2=12.5±0.6 ns), in85Kr at 1991 keV (T1/2=1.2+ 1.00.4 μs) and in86Kr at 2250 keV (T1/2=3.1±0.6 ns). Spin and parity 19/2− have been assigned to the new isomer in85Rb that is interpreted as the coupling of a p3/2 proton to the g 2/−29 two-neutron excitation of the N=48 neutron system. Using the TDPAD method an upper limit for the g-factor of ¦g¦≦0.17 has been estimated for this isomer. The same two-neutron excitation is also believed to be responsible for the new isomer in83Br. The new isomers in85Kr and86Kr are interpreted as configurations containing the two-proton excitation (f 2/−15 , p 2/−13 ) where in the isomeric 17/2+ level of85Kr an additional g9/2 neutron hole is involved.
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The authors are very indebted to the staff of the Rossendorf cyclotron, in particular to Mr. H. Odrich, Mr. G. Kerber and Mr. P. Hartmann, for providing the7Li beam. They are also grateful to Professor J. Blomqvist (MSI Stockholm) for an enlightening discussion on the estimate of excitation energies for shell model configurations.