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Open Access item Nuclear structure of Ac-231

Authors:Boutami, Rafik
García Borge, María José
Fraile, Luis M.
García-Raffi, L. M.
Martínez, T.
Rubio, Berta
Taín, José Luis
Tengblad, Olof
Keywords:Radioactivity, Fr-231, 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 Date:19-Aug-2008
Citation:Nuclear Physics A 811(3-4): 244–275 (2008)
Abstract:The 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.
Description:32 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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