1. Two-quasiparticle and collective excitations in transitional 108,110Pd nuclei.
- Author
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Lalkovski, S., Minkova, A., Porquet, M.-G., Bauchet, A., Deloncle, I., Astier, A., Buforn, N., Donadille, L., Dorvaux, O., Gall, B. P. J., Lucas, R., Meyer, M., Prévost, A., Redon, N., Schulz, N., and Stézowski, O.
- Subjects
QUASIPARTICLES ,NUCLEAR excitation ,ISOTOPES ,SPECTRUM analysis ,HEAVY ions ,NUCLEAR fission - Abstract
High-spin states in
108,110 Pd isotopes are studied by γ-ray spectroscopy of heavy-ion-induced fission. The Pd isotopes are produced in the fission channel of the31 P +176 Yb reaction at beam energy 152 MeV. The prompt γ-rays are detected with the EUROBALL4 multidetector array. The yrast states of108,110 Pd have been observed above the region of the first backbend. The level scheme of108 Pd was extended with a new negative-parity band. The yrast sequence in110 Pd is observed up to spin I = 14+ and negative-parity bands have also been identified. The back bending in these even-mass Pd isotopes is associated with the alignment of the neutron (h11/2 )² pair. The negative-parity states arise from two neutron configurations vh11/2 ⊗ vg7/2 and vh11/2 ⊗ vd5/2 and they are interpreted in the frame of two-quasiparticle + rotor model as semidecoupled bands. The observed experimental staggering in the γ-bands of108,110 Pd supports the theoretical predictions for γ-instability of their shapes. [ABSTRACT FROM AUTHOR]- Published
- 2003
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