Onset of Collectivity in Neutron Deficient $^{196,198}$Po

Details Onset of Collectivity in Neutron Deficient $^{196,198}$Po Onset of Collectivity in Neutron Deficient $^{196,198}$Po

1995-02-28

arxiv.org/abs/nucl-ex/9502003v2

Phys.Rev.C52:621-627,1995

Physics

Nuclear Physics

Nuclear Experiment

(accepted by Phys. Rev. C, in press) 18 pages, revtex 3.0, Five figs. available upon request

Scientific paper

10.1103/PhysRevC.52.621

We have studied via in-beam $\gamma$-ray spectroscopy $^{196}$Po and $^{198}$Po, which are the first neutron-deficient Po isotopes to exhibit a collective low-lying structure. The ratios of yrast state energies and the E2 branching ratios of transitions from non-yrast to yrast states are indicative of a low-lying vibrational structure. The onset of collective motion in these isotopes can be attributed to the opening of the neutron i$_{13/2}$ orbital at N$\approx$112 and the resulting large overlap between the two valence protons in the h$_{9/2}$ orbital and the valence neutrons in the i$_{13/2}$ orbital.

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