High-spin study of Ta-162


Moradi F. G. , Back T., Cederwall B., Sandzelius M., Atac A., Johnson A., ...More

PHYSICAL REVIEW C, vol.84, no.6, 2011 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 84 Issue: 6
  • Publication Date: 2011
  • Doi Number: 10.1103/physrevc.84.064312
  • Title of Journal : PHYSICAL REVIEW C

Abstract

Excited states in the odd-odd neutron deficient nucleus Ta-162 (Z = 73, N = 89) have been studied for the first time. The gamma spectroscopy analysis using gamma - gamma - gamma coincidences revealed a strongly coupled rotational structure that was established up to large angular momentum states. The rotational band was assigned to the configuration pi h(11/2)[514]9/2 circle times nu i(13/2)[660]1/2 based on its rotational and electromagnetic properties. The data are interpreted within the framework of total Routhian surface calculations, which suggests an axially symmetric shape with a gamma-softminimum at beta(2) approximate to 0.16 and gamma approximate to 6 degrees. The crossing of the signature partners observed in heavier (N >= 91) odd-odd nuclides in this mass region is found to be absent at N = 89. This might be correlated with a change in S-band structure above the paired band crossing at these neutron numbers.