Nuclear structure properties and weak interaction rates of even-even Fe isotopes
arXiv:2410.19335 · doi:10.1016/j.cjph.2024.05.004
Abstract
Nuclear structure properties and weak interaction rates of neutron rich even even iron (Fe) isotopes (A = 50 70) are investigated using the Interacting Boson Model1 (IBM1) and the proton neutron Quasiparticle Random Phase Approximation (pnQRPA) model. The IBM1 is used for the calculation of energy levels and the B(E2) values of neutron rich Fe isotopes. Later their geometry was predicted within the potential energy formalism of the IBM1 model. Weak interaction rates on neutron rich nuclei are needed for the modeling and simulation of presupernova evolution of massive stars. In the current study, we investigate the possible effect of nuclear deformation on stellar rates of even even Fe isotopes. The pnQRPA model is applied to calculate the weak interaction rates of selected Fe isotopes using three different values of deformation parameter. It is noted that, in general, bigger deformation values led to smaller total strength and larger centroid values of the resulting Gamow Teller distributions. This later translated to smaller computed weak interaction rates. The current finding warrants further investigation before it may be generalized.The reported stellar rates are up to 4 orders of magnitude smaller than previous calculations and may bear astrophysical significance.
27 pages, 6 figures, 7 Tables
References in corpus (17)
- Nuclear ground-state masses and deformations: FRDM(2012)
- Theory of Core-Collapse Supernovae
- Shell-model calculations of stellar weak interaction rates: II. Weak rates for nuclei in the mass range A=45-65 in supernovae environment
- Nuclear weak-interaction processes in stars
- Tables of E2 Transition Probabilities from the first States in Even-Even Nuclei
- Superallowed 0+ to 0+ nuclear beta decays: A new survey with precision tests of the conserved vector current hypothesis and the standard model
- Presupernova Evolution with Improved Rates for Weak Interactions
- Improved estimate of electron capture rates on nuclei during stellar core collapse
- Weak Interaction Rates Of sd-Shell Nuclei In Stellar Environment Calculated in the Proton-Neutron Quasiparticle Random Phase Approximation
- Estimates of Stellar Weak Interaction Rates for Nuclei in the Mass Range A=65-80
- Supernova electron capture rates for 55Co and 56Ni
- An Update of B(E2) Evaluation for 0+1 -> 2+1 Transitions in Even-Even Nuclei near N~Z~28
- Towards a unified realistic shell-model Hamiltonian with the monopole-based universal force
- Nuclear shape transitions, level density, and underlying interactions
- Investigation of important weak interaction nuclei in presupernova evolution
- Electron capture cross sections and nuclear partition functions for fp-shell nuclei
- Nuclear Structure Properties of even-even Chromium Isotopes and the E ect of Deformation on Calculated Electron Capture Cross Sections