New Phase Space Calculations for β-Decay Half-Lives
We revisit the computation of the phase space factors (PSF) involved in the positron decay and EC processes for a large number of nuclei of experimental interest. To obtain the electron/positron wave functions, we develop a code for solving accurately the Dirac equation with a nuclear potential deri...
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doaj-de919fb47c3f45a18296df9231e0b9c42020-11-24T21:07:17ZengHindawi LimitedAdvances in High Energy Physics1687-73571687-73652016-01-01201610.1155/2016/87298938729893New Phase Space Calculations for β-Decay Half-LivesSabin Stoica0Mihail Mirea1Ovidiu Niţescu2Jameel-Un Nabi3Mavra Ishfaq4Horia Hulubei Foundation, P.O. MG6, 077125 Magurele, RomaniaHoria Hulubei Foundation, P.O. MG6, 077125 Magurele, RomaniaHoria Hulubei National Institute of Physics and Nuclear Engineering, P.O. Box MG6, 077125 Magurele, RomaniaGIK Institute of Engineering Sciences and Technology, Topi 23640, Khyber Pakhtunkhwa, PakistanGIK Institute of Engineering Sciences and Technology, Topi 23640, Khyber Pakhtunkhwa, PakistanWe revisit the computation of the phase space factors (PSF) involved in the positron decay and EC processes for a large number of nuclei of experimental interest. To obtain the electron/positron wave functions, we develop a code for solving accurately the Dirac equation with a nuclear potential derived from a realistic proton density distribution in the nucleus. The finite nuclear size (FNS) and screening effects are included through recipes which differ from those used in previous calculations. Comparing our results with previous calculations, performed with the same Q-values, we find a close agreement for positron decays, while, for the EC process, there are relevant differences. For the EC process, we also find that the screening effect has a notable influence on the computed PSF values especially for light nuclei. Further, we recomputed the same PSF values but using the most recent Q-values reported in literature. In several cases, the new Q-values differ significantly from the older ones, leading to large differences in the PSF values as compared with previous results. Our new PSF values can contribute to more reliable calculations of the beta-decay rates, used in the study of nuclei far from the stability line and stellar evolution.http://dx.doi.org/10.1155/2016/8729893 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sabin Stoica Mihail Mirea Ovidiu Niţescu Jameel-Un Nabi Mavra Ishfaq |
spellingShingle |
Sabin Stoica Mihail Mirea Ovidiu Niţescu Jameel-Un Nabi Mavra Ishfaq New Phase Space Calculations for β-Decay Half-Lives Advances in High Energy Physics |
author_facet |
Sabin Stoica Mihail Mirea Ovidiu Niţescu Jameel-Un Nabi Mavra Ishfaq |
author_sort |
Sabin Stoica |
title |
New Phase Space Calculations for β-Decay Half-Lives |
title_short |
New Phase Space Calculations for β-Decay Half-Lives |
title_full |
New Phase Space Calculations for β-Decay Half-Lives |
title_fullStr |
New Phase Space Calculations for β-Decay Half-Lives |
title_full_unstemmed |
New Phase Space Calculations for β-Decay Half-Lives |
title_sort |
new phase space calculations for β-decay half-lives |
publisher |
Hindawi Limited |
series |
Advances in High Energy Physics |
issn |
1687-7357 1687-7365 |
publishDate |
2016-01-01 |
description |
We revisit the computation of the phase space factors (PSF) involved in the positron decay and EC processes for a large number of nuclei of experimental interest. To obtain the electron/positron wave functions, we develop a code for solving accurately the Dirac equation with a nuclear potential derived from a realistic proton density distribution in the nucleus. The finite nuclear size (FNS) and screening effects are included through recipes which differ from those used in previous calculations. Comparing our results with previous calculations, performed with the same Q-values, we find a close agreement for positron decays, while, for the EC process, there are relevant differences. For the EC process, we also find that the screening effect has a notable influence on the computed PSF values especially for light nuclei. Further, we recomputed the same PSF values but using the most recent Q-values reported in literature. In several cases, the new Q-values differ significantly from the older ones, leading to large differences in the PSF values as compared with previous results. Our new PSF values can contribute to more reliable calculations of the beta-decay rates, used in the study of nuclei far from the stability line and stellar evolution. |
url |
http://dx.doi.org/10.1155/2016/8729893 |
work_keys_str_mv |
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1716763447480287232 |