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Open Access Publications from the University of California

α decay of high-spin isomers in N=84 isotones

  • Author(s): Clark, RM
  • Crawford, HL
  • MacChiavelli, AO
  • Rudolph, D
  • Såmark-Roth, A
  • Campbell, CM
  • Cromaz, M
  • Fallon, P
  • Morse, C
  • Santamaria, C
  • et al.

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The superfluid tunneling model is applied to the calculation of half-lives of the observed α decays in N=84 isotones. Results of our calculations are compared to experimental data on the ground-state α decays along the isotonic chain from Nd144 to Re159. Good agreement is found. The α decays of the known high-spin isomers in Lu155, Hf156, Ta157, and W158 are also well reproduced, once a reduction in the pairing strength is taken into account. This includes reproduction of the main features of the recently observed fine structure from Lu155(25/2-) and Hf156(8+). Predictions for the α-decay fine structure of Ta157(25/2-) and W158(8+) high-spin isomers are presented.

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