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Nuclear structure of Ac-231

AuthorsBoutami, Rafik ; García Borge, María José ; Fraile, Luis M. ; García Raffi, Luis M. ; Martínez Pérez, Trinitario; Rubio, Berta ; Taín, José Luis ; Tengblad, Olof
Ra(β−)-231 [from 238U(p, X), Ep=1 GeV and subsequent mass separation]
Measured, E(γ), I(γ), E(β), γγ-, βγ-coincidence, T(1/2)
Deduced, log(ft)
Ac-231 deduced, levels, J, π, ICC, multipolarities, B(E1), B(M1), T1/2
Mini-orange spectrometer
Advanced Time Delayed (ATD) βγγ(t) method
Issue Date19-Aug-2008
CitationNuclear Physics A 811(3-4): 244–275 (2008)
AbstractThe low-energy structure of Ac-231 has been investigated by means of γ ray spectroscopy following the β− decay of Ra-231. Multipolarities of 28 transitions have been established by measuring conversion electrons with a MINI-ORANGE electron spectrometer. The decay scheme of Ra-231 → Ac-231 has been constructed for the first time. The Advanced Time Delayed βγγ(t) method has been used to measure the half-lives of five levels. The moderately fast B(E1) transition rates derived suggest that the octupole effects, albeit weak, are still present in this exotic nucleus.
Description32 pages, 7 figures, 5 tables.-- PACS nrs.: 21.10.-k; 21.10.Tg; 21.10.Re; 23.20.-g; 23.20.Lv; 27.90.+b.-- Printed version published Oct 15, 2008.-- et al.-- ArXiv pre-print available at: http://arxiv.org/abs/0808.0790
Publisher version (URL)http://dx.doi.org/10.1016/j.nuclphysa.2008.08.005
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(IFIC) Artículos
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