First-forbidden beta-decay rates, energy rates of beta-delayed neutrons and probability of beta-delayed neutron emissions for neutron-rich nickel isotopes


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Nabi J., ÇAKMAK N. , Iftikhar Z.

EUROPEAN PHYSICAL JOURNAL A, cilt.52, 2016 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 52 Konu: 1
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1140/epja/i2016-16005-6
  • Dergi Adı: EUROPEAN PHYSICAL JOURNAL A

Özet

First-forbidden (FF) transitions can play an important role in decreasing the calculated half-lives specially in environments where allowed Gamow-Teller (GT) transitions are unfavored. Of special mention is the case of neutron-rich nuclei where, due to phase-space amplification, FF transitions are much favored. We calculate the allowed GT transitions in various pn-QRPA models for even-even neutron-rich isotopes of nickel. Here we also study the effect of deformation on the calculated GT strengths. The FF transitions for even-even neutron-rich isotopes of nickel are calculated assuming the nuclei to be spherical. Later we take into account deformation of nuclei and calculate GT + unique FF transitions, stellar beta-decay rates, energy rate of beta-delayed neutrons and probability of beta-delayed neutron emissions. The calculated half-lives are in excellent agreement with measured ones and might contribute in speeding-up of the r-matter flow.