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Absence of paired crossing in the positive parity bands of Cs 124

  • Author(s): Singh, AK;
  • Basu, A;
  • Nag, S;
  • Hübel, H;
  • Domscheit, J;
  • Ragnarsson, I;
  • Al-Khatib, A;
  • Hagemann, GB;
  • Herskind, B;
  • Elema, DR;
  • Wilson, JN;
  • Clark, RM;
  • Cromaz, M;
  • Fallon, P;
  • Görgen, A;
  • Lee, IY;
  • Ward, D;
  • Ma, WC
  • et al.
Abstract

High-spin states in Cs124 were populated in the Ni64(Ni64,p3n) reaction and the Gammasphere detector array was used to measure γ-ray coincidences. Both positive- and negative-parity bands, including bands with chiral configurations, have been extended to higher spin, where a shape change has been observed. The configurations of the bands before and after the alignment are discussed within the framework of the cranked Nilsson-Strutinsky model. The calculations suggest that the nucleus undergoes a shape transition from triaxial to prolate around spin I≃22 of the positive-parity states. The alignment gain of 8â.,, observed in the positive-parity bands, is due to partial alignment of several valence nucleons. This indicates the absence of band crossing due to paired nucleons in the bands.

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