Abstract
In astrophysical environments, allowed Gamow-Teller (GT) transitions are important, particularly for β-decay rates in presupernova evolution of massive stars, since they contribute to the fine-tuning of the lepton-to baryon content of the stellar matter prior to and during the collapse of a heavy star. In environments where GT transitions are unfavored, first-forbidden transitions become important especially in medium heavy and heavy nuclei. Particularly in case of neutron-rich nuclei, first-forbidden transitions are favored primarily due to the phase-space amplification for these transitions. In this study, the angular part of the beta (β) moment matrix elements of the , and first forbidden beta decay transition have been solved directly without any assumption. In the calculation of the nuclear matrix elements have been considered the contribution coming from the spin-orbit term in the shell model potential.
Keywords
References
- -
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Abstract
References
- -
- Borzov I.N., Beta-decay rates, Nucl.Phys.A 777, 645-675 (2006).
- Borzov I.N., Gamow-Teller and first-forbidden decays near the r-process paths at N=50, 82, and
- 126, Phys.Rev.C 67, 025802 (2003).
- Borzov I.N., The first-forbidden decays near the r-process paths at N=50, 82, 126, Nucl.Phys.A 718, 635c-637c (2003).
- Schopper H.F., Weak Interactions and Nuclear Beta Decay, North-Holland, Amsterdam, (1996).
- Ejiri Hirayasu, Double Beta Decays and Neutrino Masses, J. Phys. Soc. Jpn. 74, 2101-2127 (2005).
- Barbero C. et al., Competition between standard and exotic double beta decays, Phys.Lett.B 436, 49-54 (1998).
- Civitarese O., Suhonen J., Contributions of unique first-forbidden transitions to two-neutrino double-β-decay half-lives, Nucl.Phys.A 607, 152-162 (1996).
- Cakmak N. et al., The investigation of 0+ 0- β decay in some spherical nuclei, Pramana Journal of Physics, 74 (4), 541-553 (2010).
- Bohr A., Mottelson B.R., Nuclear Structure, Vol.I (1969).
- Çaylı İsmail, Calculation of nuclear matrix elements for λπ =1- first forbidden beta transitions, Master of Thesis (in Turkish), Karabuk University, Karabük, Turkey (2012).
- Varshalovich D.A, Moskalev A.N. and Khersonskii V.K., Quantum Theory of Angular Momentum, Word Scientific (1988).
Details
| Primary Language | English |
|---|---|
| Journal Section | Editorial |
| Authors | |
| Publication Date | January 8, 2015 |
| Published in Issue | Year 2015 Volume: 36 Issue: 2 |