scholarly journals Comparative study of Gamow-Teller strength distributions in the odd-odd nucleusV50and its impact on electron capture rates in astrophysical environments

2007 ◽  
Vol 76 (5) ◽  
Author(s):  
Jameel-Un Nabi ◽  
Muhammad Sajjad
Keyword(s):  
Comparative Study ◽  
Electron Capture ◽  
Gamow Teller ◽  
Capture Rates ◽  
Strength Distributions

Gamow-Teller transitions to Zr93 via the Nb93(t,He3+γ ) reaction at 115 MeV/u and its application to the stellar electron-capture rates

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

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
Keyword(s):  
Electron Capture ◽  
Theoretical Calculations ◽  
Random Phase ◽  
Measured Data ◽  
Particle Model ◽  
Transition Strength ◽  
Positron Emission ◽  
Stellar Temperature ◽  
Gamow Teller ◽  
Capture Rates

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.

The 76Se Gamow–Teller strength distribution and its importance for stellar electron capture rates

2011 ◽  
Vol 859 (1) ◽  
pp. 172-184 ◽  
Author(s):  
Q. Zhi ◽  
K. Langanke ◽  
G. Martínez-Pinedo ◽  
F. Nowacki ◽  
K. Sieja
Keyword(s):  
Electron Capture ◽  
Strength Distribution ◽  
Gamow Teller ◽  
Capture Rates

scholarly journals Gamow-Teller strengths and electron-capture rates forpf-shell nuclei of relevance for late stellar evolution

2012 ◽  
Vol 86 (1) ◽  
Author(s):  
A. L. Cole ◽  
T. S. Anderson ◽  
R. G. T. Zegers ◽  
Sam M. Austin ◽  
B. A. Brown ◽  
...  
Keyword(s):  
Electron Capture ◽  
Stellar Evolution ◽  
Gamow Teller ◽  
Capture Rates ◽  
Gamow Teller Strengths

scholarly journals Gamow-Teller transitions toCa45via theSc45(t,He3+γ)reaction at115 MeV/uand its application to stellar electron-capture rates

2015 ◽  
Vol 92 (2) ◽  
Author(s):  
S. Noji ◽  
R. G. T. Zegers ◽  
Sam M. Austin ◽  
T. Baugher ◽  
D. Bazin ◽  
...  
Keyword(s):  
Electron Capture ◽  
Gamow Teller ◽  
Capture Rates

scholarly journals Allowed Gamow-Teller strength distributions and stellar electron capture rates on odd-A nuclei

2019 ◽  
Vol 49 ◽  
pp. 1960009
Author(s):  
Jameel-Un Nabi ◽  
Muhammad Majid ◽  
Muhammad Riaz
Keyword(s):  
Electron Capture ◽  
Heavy Nuclei ◽  
Independent Particle ◽  
Good Accordance ◽  
Supernova Explosions ◽  
Stellar Temperatures ◽  
Late Stages ◽  
Theoretical Results ◽  
Gamow Teller ◽  
Strength Distributions

The allowed Gamow-Teller (GT) strength distributions and associated weak interaction rates on fp-shell nuclei play crucial role in several astrophysical processes, particularly in nucleosynthesis, stellar evolution and supernova explosions. Results from simulation show that the electron capture (EC) rates on medium-heavy nuclei have a significant impact on decreasing the electron-to-baryon ratio of the stellar matter during the late stages of star formation. In this work we present the computation of allowed charge-changing transitions for odd-A fp-shell nuclei by using the deformed pn-QRPA model. The calculated GT strength distributions are compared with previous calculations (including shell and other QRPA models) and measured charge-changing reaction results. The associated EC rates are computed in stellar environment and are compared with previous theoretical results. It is concluded that our results are in good accordance with measured data. For [Formula: see text]Sc, [Formula: see text]V and [Formula: see text]Co, at high stellar temperatures, our calculated EC rates are bigger than the independent-particle and shell model rates. For [Formula: see text]Mn we generally calculate smaller EC rates than previous calculations. The differences with previous calculations may have consequences for supernovae simulators.

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