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Low-Spin States From Decay Studies in the Mass 80 Region
J Döring1, A Aprahamian1, M Wiescher1
1Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556.
Abstract:
Neutron-deficient nuclei in the mass 80 region are known to exhibit strongly deformed ground states deduced mainly from yrast-state properties measured in-beam via heavy-ion fusion-evaporation reactions. Vibrational excitations and non-yrast states as well as their interplay with the observed rotational collectivity have been less studied to date within this mass region. Thus, several β-decay experiments have been performed to populate low-spin states in the neutron-deficient (80,84)Y and (80,84)Sr nuclei. An overview of excited 0(+) states in Sr and Kr nuclei is given and conclusions about shape evolution at low-spins are presented. In general, the non-yrast states in even-even Sr nuclei show mainly vibration-like collectivity which evolves to rotational behavior with increasing spin and decreasing neutron number.
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