Onset of Collectivity in Neutron Deficient 196,198Po
L. A. Bernstein, J. A. Cizewski, H. -Q. Jin, W. Younes, R. G. Henry, L. P. Farris, A. Charos, M. P. Carpenter, R. V. F. Janssens, T. L. Khoo, T. Lauritsen, I. G. Bearden, D. Ye, J. A. Becker, E. A. Henry, M. J. Brinkman, J. R. Hughes, A. Kuhnert, T. F. Wang, M. A. Stoyer, R. M. Diamond, F. S. Stephens, M. A. Deleplanque, A. O. Macchiavelli, I. Y. Lee, B. Cederwall, J. R. B. Oliveira, J. Burde, P. Fallon, C. Duyar, J. E. Draper, E. Rubel, D. T. Vo
Abstract
We have studied via in-beam γ-ray spectroscopy 196Po and 198Po, 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 i13/2 orbital at N≈112 and the resulting large overlap between the two valence protons in the h9/2 orbital and the valence neutrons in the i13/2 orbital.
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