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Onset of collectivity in neutron deficient Po196,198

  • Author(s): Bernstein, LA
  • Cizewski, JA
  • Jin, HQ
  • Younes, W
  • Henry, RG
  • Farris, LP
  • Charos, A
  • Carpenter, MP
  • Janssens, RVF
  • Khoo, TL
  • Lauritsen, T
  • Bearden, IG
  • Ye, D
  • et al.

We have studied via in-beam -ray spectroscopy Po196 and Po198, 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 N112 and the resulting large overlap between the two valence protons in the h9/2 orbital and the valence neutrons in the i13/2 orbital. © 1995 The American Physical Society.

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