title: Low-Spin States From Decay Studies in the Mass 80 Region.
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.
authors.affiliation: Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556.
authors.forename: J
authors.initials: J
authors.lastname: Döring
authors.affiliation: Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556.
authors.forename: A
authors.initials: A
authors.lastname: Aprahamian
authors.affiliation: Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556.
authors.forename: M
authors.initials: M
authors.lastname: Wiescher
keywords: low-spin states; neutron deficient nuclei; prolate deformation