Decay characteristics of neutron excess iron nuclei

In neutron star mergers, neutron excess nuclei and the r-process are important factors governing the production of heavy nuclear systems. An evaluation of iron nuclei suggests that the heaviest Z = 26 nucleus will have mass 76 with filling of the 1g9/2 neutron shell. A = 73‐76 iron isotopes have limited experimental half-life data, but the model predicts beta decay half-lives in the range of 20‐30 ms. Based on comparisons to Z = 20 and lighter Z = 26 systems, these results likely overestimate the experimental half-lives of these A = 73‐76 neutron excess iron nuclei.

Determination of single neutron spectroscopic factor of doubly shell closed, neutron shell closed and neutron-rich nuclei through (d,p) reaction

The spectroscopic factor (SF) of doubly-magic nuclei, neutron shell closed and neutron-rich nuclei has been determined through ([Formula: see text], [Formula: see text]) reaction in the projectile energy range from 3 to 26[Formula: see text]MeV. The theoretical angular differential cross-sections of ([Formula: see text], [Formula: see text] reactions in scattering center-of-mass angles from [Formula: see text] to [Formula: see text] have been calculated using FRESCO and NRV-DWUCK5 codes. By comparing the theoretical angular differential cross-sections with available experimental angular differential cross-sections, the values of SF have been determined. The exponential increase of SF as a function of neutron separation energy normalized by spin of the recoil nuclei has been shown for the first time for doubly-magic nuclei. The similar type of trend has also been observed for neutron-rich as well as neutron shell closed nuclei as a function of neutron separation energy normalized by asymmetric factor of recoil nucleus. More experimental data are required to verify the trend predicted by this investigation.

Alpha-decay half-lives of polonium isotopes in the mass range of 186–218

The [Formula: see text]-decay (AD) half-life (HL) of [Formula: see text]Po [Formula: see text] isotopes is studied systematically within the modified Coulomb and proximity potential model (MCPPM). The computed HLs are compared with the existing theoretical formulae including Royer, AKRE, Ren B and MRen B. This study considers the role of neutron shell closure [Formula: see text] on the AD HLs. The comparison with the experimental data indicates the acceptability of the results.