Ramalho, M. and Suhonen, J. (2024) Shell-model treatment of the β decay of 99Tc. Il nuovo cimento C, 47 (6). pp. 1-6. ISSN 1826-9885
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Abstract
In the present paper we treat the second-forbidden non-unique (2nd-nu) ground-state-to-ground-state β− decay 99Tc(9/2+) → 99Ru(5/2+), with a 100% branching ratio, within the framework of the nuclear shell model (NSM). The energy spectrum of the electrons emitted in this β-decay transition (β-electron spectrum) is sensitive to the wave functions of the involved initial (9/2+) and final (5/2+) nuclear ground states through the many involved nuclear matrix elements (NME). The β-electron spectrum of this transition is potentially indicative of the effective value, geff A , of the weak axial coupling, gA, of crucial importance for extraction of information on beyond-the-standard-model physics from the results of the present and future rare-events experiments. We describe the β spectral shape of this decay by using a state-of-the-art β-decay formalism and compute the many involved NME using the well established NSM Hamiltonians jj45pnb and glekpn. We have found a strong dependence of the β spectral shape on the value of gA making it a good candidate for determination of the value of geff A through comparison with the corresponding experimental β spectral shape. We have also found an interesting dependence of the β spectral shape on the value of the so-called small relativistic vector NME, sNME, used to match the computed half-life with the measured one.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 27 Feb 2025 11:03 |
| Last Modified: | 27 Feb 2025 11:03 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/23424 |
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