Re examination of the effect of Pairing Gaps on Gamow Teller Strength Distributions and beta decay Rates

Abstract

Beta decay is one of the key factors to understand the r process and evolution of massive stars. The Gamow Teller (GT) transitions drive the beta decay process. We employ the proton neutron quasiparticle random phase approximation (on QRPA) model to calculate terrestrial and stellar beta decay rates for 50 top ranked nuclei possessing astrophysical significance according to a recent survey. The model parameters of the on QRPA model affect the predicted results of beta decay. The current study investigates the effect of nucleon nucleon pairing gaps on charge changing transitions and the associated beta decay rates. Three different values of pairing gaps, namely TF, 3TF and 5TF, were used in our investigation. It was concluded that both GT strength distributions and half lives are sensitive to pairing gap values. The 3TF pairing gap scheme, in our chosen nuclear model, resulted in best prediction with around 80 percent of the calculated half-lives within a factor 10 of the measured ones. The 3TF pairing scheme also led to calculation of biggest beta decay rates in stellar matter.

arXiv comment32 pages 8 Tables 7 figures

References in corpus (26)

• Nuclear ground-state masses and deformations: FRDM(2012)
• Theory of Core-Collapse Supernovae
• A kilonova as the electromagnetic counterpart to a gravitational-wave source
• Nuclear weak-interaction processes in stars
• Identification of strontium in the merger of two neutron stars
• Superallowed 0+ to 0+ nuclear beta decays: A new survey with precision tests of the conserved vector current hypothesis and the standard model
• Collapsars as a major source of r-process elements
• Pairing gaps from nuclear mean-field models
• Discrepancy between experimental and theoretical $\beta$-decay rates resolved from first principles
• Odd-Even Staggering of Nuclear Masses: Pairing or Shape Effect?
• Beta decay of r-process waiting-point nuclei in a self-consistent approach
• The consequences of nuclear electron capture in core collapse supernovae
• Presupernova Evolution with Improved Rates for Weak Interactions
• Weak Interaction Rates Of sd-Shell Nuclei In Stellar Environment Calculated in the Proton-Neutron Quasiparticle Random Phase Approximation
• Nuclear mass predictions with machine learning reaching the accuracy required by $r$-process studies
• Electron capture and beta-decay rates for sd-shell nuclei in stellar environments relevant to high density O-Ne-Mg cores
• Astrophysical weak-interaction rates for selected $A=20$ and $A=24$ nuclei
• Electron capture on iron group nuclei
• Structure of 65,67Co studied through the beta decay of 65,67Fe and a deep-inelastic reaction
• Discovery of an Exceptionally Strong $\beta$-Decay Transition of ${}^{20}$F and Implications for the Fate of Intermediate-Mass Stars
• $\beta$ decay of even-A nuclei within the interacting boson model based on nuclear density functional theory
• Investigation of important weak interaction nuclei in presupernova evolution
• Shell model results for nuclear ${\beta }^{-}$-decay properties of $sd$ shell nuclei
• Investigation of effects of pairing correlations on calculated $\beta$-decay half-lives of fp-shell nuclei
• Stellar Weak Rates and Mass Fractions of 20 Most Important $fp$-shell Nuclei with $A<65$
• Paring correlations within the micro-macroscopic approach for the level density

Cited by in corpus (1)

• Galaxy spin direction asymmetry in JWST deep fields