Study of Gamow–Teller strength and associated weak-rates on odd-A nuclei in stellar matter

2018 ◽  
Vol 27 (03) ◽  
pp. 1850019 ◽  
Author(s):  
Muhammad Majid ◽  
Jameel-Un Nabi ◽  
Muhammad Riaz

In a recent study by Cole et al. [A. L. Cole et al., Phys. Rev. C 86 (2012) 015809], it was concluded that quasi-particle random phase approximation (QRPA) calculations show larger deviations and overestimate the total experimental Gamow–Teller (GT) strength. It was also concluded that QRPA calculated electron capture rates exhibit larger deviation than those derived from the measured GT strength distributions. The main purpose of this study is to probe the findings of the Cole et al. paper. This study gives useful information on the performance of QRPA-based nuclear models. As per simulation results, the capturing of electrons that occur on medium heavy isotopes have a significant role in decreasing the ratio of electron-to-baryon content of the stellar interior during the late stages of core evolution. We report the calculation of allowed charge-changing transitions strength for odd-[Formula: see text] [Formula: see text]-shell nuclei ([Formula: see text]Sc and [Formula: see text]Mn) by employing the deformed pn-QRPA approach. The computed GT transition strength is compared with previous theoretical calculations and measured data. For stellar applications, the corresponding electron capture rates are computed and compared with rates using previously calculated and measured GT values. Our finding shows that our calculated results are in decent accordance with measured data. At higher stellar temperature, our calculated electron capture rates are larger than those calculated by independent particle model (IPM) and shell model. It was further concluded that at low temperature and high density regions, the positron emission weak-rates from [Formula: see text]Sc and [Formula: see text]Mn may be neglected in simulation codes.

2020 ◽  
Vol 101 (1) ◽  
Author(s):  
B. Gao ◽  
R. G. T. Zegers ◽  
J. C. Zamora ◽  
D. Bazin ◽  
B. A. Brown ◽  
...  

2011 ◽  
Vol 859 (1) ◽  
pp. 172-184 ◽  
Author(s):  
Q. Zhi ◽  
K. Langanke ◽  
G. Martínez-Pinedo ◽  
F. Nowacki ◽  
K. Sieja

2012 ◽  
Vol 86 (1) ◽  
Author(s):  
A. L. Cole ◽  
T. S. Anderson ◽  
R. G. T. Zegers ◽  
Sam M. Austin ◽  
B. A. Brown ◽  
...  

2008 ◽  
Vol 86 (6) ◽  
pp. 819-828 ◽  
Author(s):  
J -U Nabi ◽  
M Sajjad

Because of its abundance and its relatively high capture rates, 55Co is one of the key nuclide that can control the dynamics of core collapse of a massive star. Previously we introduced our microscopic calculations of capture rates on 55Co using the proton–neutron quasi-particle random phase approximation (pn-QRPA) theory. Here, we present for the first time an expanded calculation of the electron capture rates on 55Co on an extensive temperature-density scale. This type of scale is appropriate for interpolation purposes and of greater utility for simulation codes.PACS Nos.: 26.50.+x, 21.60.Jz, 23.40.–s, 27.40.+z


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