Sunday, August 4, 2013

1308.0162 (A. Astier et al.)

High-spin structures of 88Kr and 89Rb: Evolution from collective to
single-particle behaviors

A. Astier, M. -G. Porquet, Ts. Venkova, G. Duchene, F. Azaiez, D. Curien, I. Deloncle, O. Dorvaux, B. J. P. Gall, N. Redon, M. Rousseau, O. Stezowski
The high-spin states of the two neutron-rich nuclei, 88Kr and 89R have been studied from the 18O + 208Pb fusion-fission reaction. Their level schemes were built from triple gamma-ray coincidence data and gamma-gamma angular correlations were analyzed in order to assign spin and parity values to most of the observed states. The two levels schemes evolve from collective structures to single-particle excitations as a function of the excitation energy. Comparison with results of shell-model calculations gives the specific proton and neutron configurations which are involved to generate the angular momentum along the yrast lines.
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