Comparative study of Gamow-Teller strength distributions in the odd-odd nucleus {sup 50}V and its impact on electron capture rates in astrophysical environments
- Faculty of Engineering Sciences, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi 23640, Swabi, NWFP (Pakistan)
Gamow-Teller (GT) strength transitions are an ideal probe for testing nuclear structure models. In addition to nuclear structure, GT transitions in nuclei directly affect the early phases of Type Ia and Type-II supernovae core collapse since the electron capture rates are partly determined by these GT transitions. In astrophysics, GT transitions provide an important input for model calculations and element formation during the explosive phase of a massive star at the end of its life-time. Recent nucleosynthesis calculations show that odd-odd and odd-A nuclei cause the largest contribution in the rate of change of lepton-to-baryon ratio. In the present manuscript, we have calculated the GT strength distributions and electron capture rates for odd-odd nucleus {sup 50}V by using the pn-QRPA theory. At present {sup 50}V is the first experimentally available odd-odd nucleus in fp-shell nuclei. We also compare our GT strength distribution with the recently measured results of a {sup 50}V(d, {sup 2}He){sup 50}Ti experiment, with the earlier work of Fuller, Fowler, and Newman (referred to as FFN) and subsequently with the large-scale shell model calculations. One curious finding of the paper is that the Brink's hypothesis, usually employed in large-scale shell model calculations, is not a good approximation to use at least in the case of {sup 50}V. SNe Ia model calculations performed using FFN rates result in overproduction of {sup 50}Ti, and were brought to a much acceptable value by employing shell model results. It might be interesting to study how the composition of the ejecta using presently reported QRPA rates compare with the observed abundances.
- OSTI ID:
- 21067934
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 76, Issue 5; Other Information: DOI: 10.1103/PhysRevC.76.055803; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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IMPACT OF NEW GAMOW–TELLER STRENGTHS ON EXPLOSIVE TYPE IA SUPERNOVA NUCLEOSYNTHESIS
Determination of the Gamow-Teller strength distribution from the odd-odd nucleus {sup 50}V measured through {sup 50}V(d,{sup 2}He){sup 50}Ti and astrophysical implications
Related Subjects
APPROXIMATIONS
ASTROPHYSICS
BARYONS
COMPARATIVE EVALUATIONS
DEUTERON REACTIONS
DISTRIBUTION
ELECTRON CAPTURE
ELEMENT ABUNDANCE
GAMOW-TELLER RULES
HELIUM 2
NUCLEAR STRUCTURE
NUCLEOSYNTHESIS
SHELL MODELS
STRENGTH FUNCTIONS
TITANIUM 50
VANADIUM 50
VANADIUM 50 TARGET