Abstract

In neutron star mergers, neutron excess nuclei and the r-process are important factors governing the production of heavier nuclear systems. A single-particle model evaluation of aluminum nuclei suggests that the heaviest Z = 13 nucleus will have mass 53 with filling of the 1f5/2 neutron shell. A = 40 – 53 aluminum isotopes have limited experimental half-life data, but the model predicts beta decay half-lives in the range of 0.534 – 4.62 ms. Based on previous calculations for Z = 9 -12, 20, 26, and 30 systems and comparisons to the 40Al – 43Al calculations summarized in the Japanese Nuclear Data Compilation, the single-particle model results likely overestimate the half-lives of A = 40 – 53 neutron excess aluminum nuclei.

Highlights

  • The nucleosynthesis of heavy elements occurs by three basic processes that add protons or neutrons to a nuclear system[1,2]

  • Neutron capture creates neutron-rich nuclei, and the resulting nuclear systems depend upon the rate of neutron addition and the beta decay rates of the residual nuclei

  • Neutron excess nuclei occur throughout the periodic table, this paper focuses on aluminum systems as part of a continuing investigation of neutron excess nuclei that are of potential astrophysical significance[8,9,10,11,12,13,14]

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Summary

Introduction

The nucleosynthesis of heavy elements occurs by three basic processes that add protons or neutrons to a nuclear system[1,2]. The study of neutron excess systems and their decay properties are significant considerations in understanding the r-process, and its importance in producing the observed elements in the universe. This paper attempts to partially fill the void by calculating the decay properties of neutron excess systems that are important in nucleosynthesis. Abundances were calculated using CRIS energy spectra at energies below 550 MeV/nucleon from the 1997–98 and 2009–10 solar-minimum periods, as well as from the 2001–03 solar-maximum period[17] These new results, illustrate the importance of aluminum isotopes in understanding the space radiation environment. These cross sections are relevant for r-process nucleosynthesis, and were investigated in Ref. 22 These systems included 34Al and 35Al. The 27–32Al isotopes were studied via high-resolution collinear laser spectroscopy at ISOLDE-CERN23. These detailed measurements assist in developing comprehensive theoretical models that improve the understanding of nucleosynthesis

Calculational Methodology
Results and Discussion
Conclusions
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