Gamow-Teller transitions from {sup 24}Mg and their impact on the electron capture rates in the O+Ne+Mg cores of stars

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.035803· OSTI ID:20995170

Nabi, Jameel-Un; Rahman, Muneeb-Ur ^[1]

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1. Faculty of Engineering Sciences, GIK Institute of Engineering Sciences and Technology, Topi 23640, Swabi, NWFP (Pakistan)

Electron captures on nuclei play an important role in the collapse of stellar core in the stages leading to a type-II supernova. Recent observations of subluminous Type II-P supernovae (e.g., 2005cs, 2003gd, 1999br) were able to rekindle the interest in 8-10 M{sub {center_dot}} which develop O+Ne+Mg cores. We used the proton-neutron quasiparticle random phase approximation (pn-QRPA) theory to calculate the B(GT) strength for {sup 24}Mg {yields}{sup 24}Na and its associated electron capture rates for incorporation in simulation calculations. The calculated rates, in this article, have differences with the earlier reported shell model and Fuller, Fowler, and Newman (hereafter F{sup 2}N) rates. We compared Gamow-Teller (GT) strength distribution functions and found fairly good agreement with experiment and shell model. However, the GT centroid and the total GT strength, which are useful in the calculation of electron capture rates in the core of massive presupernova stars, lead to the enhancement of our rate up to a factor of 4 compared to the shell model rates at high temperatures and densities.

• OSTI ID: 20995170
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DENSITY
DISTRIBUTION FUNCTIONS
ELECTRON CAPTURE
GAMOW-TELLER RULES
MAGNESIUM 24
NEUTRONS
PROTONS
RANDOM PHASE APPROXIMATION
SHELL MODELS
SIMULATION
SUPERNOVAE
TEMPERATURE RANGE 0400-1000 K