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Author  |
Aguilera, P. et al; Rubio, B.; Orrigo, S.E.A.; Gelletly, W.; Agramunt, J.; Algora, A.; Guadilla, V.; Montaner-Piza, A.; Morales, A.I. |
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Title |
β decay of the Tz =-2 nucleus 64Se and its descendants: The T=2 isobaric multiplet |
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Journal Article |
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Year |
2025 |
Publication |
Physical Review C |
Abbreviated Journal |
Phys. Rev. C |
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Volume |
112 |
Issue |
5 |
Pages |
054319 - 20pp |
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Abstract |
In this paper we present our results on the decay of 64Se. It is the heaviest Tz = -2 nucleus that both 9 decays and has a stable mirror partner (Tz = +2), thus allowing comparison with charge exchange reaction studies. The 9 decays of 64Se and its descendants were studied at the RIKEN Nishina Center (Japan) following their production in the fragmentation of 78Kr on a beryllium target. 9-Delayed gamma-ray and particle radiation was identified for each of the nuclei in the decay chain allowing us to obtain decay schemes for 64Se, 64As, and 63Ge. Thus new excited states could be found for the descendant nuclei, including the interesting case of the N = Z nucleus 64Ge. Furthermore, we observed for the first time the 9-delayed proton emission of 64Se and 64As. Based on these results we obtained proton branching ratios of 48.0(9)% in 64Se decay and 4.4(1)% in 64As decay. We obtained a half-life value of 22.5(6) ms for 64Se decay and half-lives slightly more precise than those in the literature for each nucleus involved in the decay chain. Using our results on the excited levels of 64As and the mass excess in the literature for 63Ge we obtained-39588(50) keV for the mass excess of 64As. Then based on the isobaric mass multiplet equation we obtained the mass excess of-27429(88) keV for 64Se by extrapolation. The mirror process of 64Se 3 decay, the charge exchange reaction 64Zn(3He, t)64Ga, has already been measured allowing us to study the mirror symmetry through the comparison of the weak force (3a decay) and strong force (charge exchange reaction). An interpretation of the decay schemes based on the idea of the antisnalogue tate is proposed. |
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Address |
[Aguilera, P.; Rubio, B.; Orrigo, S. E. A.; Gelletly, W.; Agramunt, J.; Algora, A.; Guadilla, V.; Montaner-Piza, A.; Morales, A. I.] Univ Valencia, Inst Fis Corpuscular, CSIC, E-46980 Paterna, Spain, Email: pablo.aguilera@pd.infn.it; |
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Publisher |
Amer Physical Soc |
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Language |
English |
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ISSN |
2469-9985 |
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Notes |
WOS:001625352500001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6963 |
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