Abstract
The competition between and decays is investigated for neutron-deficient Pa, U, Np, and Pu isotopes. /electron-capture (EC) decay rates are calculated within the deformed quasiparticle random-phase approximation with realistic nucleon-nucleon interactions. Contributions from allowed Gamow-Teller and Fermi transitions as well as first-forbidden transitions are considered. -decay calculations are performed within the generalized density-dependent cluster model. Effects of differences between neutron and proton distributions and nuclear deformation are taken into account. In the calculations, Reid-93 interactions are used for decays, while Michigan three-range Yukawa effective interactions, based on the -matrix elements of Reid potentials, are used for decay. The calculated -decay half-lives show good agreement with the experimental data over a range of magnitude from to s. The resulting total half-lives including and contributions are found to be in good agreement with the experimental data, together with the -decay branching ratios.
- Received 15 August 2016
- Revised 13 October 2016
DOI:https://doi.org/10.1103/PhysRevC.95.014323
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