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Closed Access item Quenched E1 transition rates in Th-231

Authors:Aas, A. J.
Mach, H.
Kvasil, J.
García Borge, María José
Fogelberg, B.
Grant, I. S.
Gulda, K.
Hagebø, E.
Hoff, P.
Kurcewicz, W.
Lindroth, A.
Løvhøiden, G.
Mackova, A.
Martínez, T.
Rubio, Berta
Sánchez-Vega, M.
Smith, J. F.
Taín, José Luis
Taylor, R. B. E.
Tengblad, Olof
Thorsteinsen, T. F.
Keywords:Radioactivity, Ac-231, β-, Measured Eγ, Iγ, γ-γ coincidences, T(1/2), Deduced Th-231 levels, B(XL), Fast-timing βγγ(t) method, Rotational bands, Quasiparticle-plus-phonon model, [PACS] Properties of nuclei; nuclear energy levels, [PACS] Lifetimes, widths, [PACS] Collective levels, [PACS] Electromagnetic transitions, [PACS] γ transitions and level energies, [PACS] Properties of specific nuclei listed by mass ranges (A ≥ 220 )
Issue Date:2-Aug-1999
Citation:Nuclear Physics A 654(3-4): 499-522 (1999)
Abstract:The fast timing βγγ(t) method has been used to measure lifetimes of the low-lying levels in Th-231 populated in the β- decay of Ac-231. The half-life of the K-π = 5/2(-) band-head at 185.7-keV was measured as T(1/2) = 1073(79) ps, yielding D-0 = 1.76(8) x 10(-2) e·fm and 1.65(6) x 10(-2) e·fm for the El transitions to the 7/2(+) and 5/2(+) members respectively of the K-π = 5/2(+) ground state band. Furthermore, T(1/2) ≤ 74 ps and ≤ 74 ps were measured for the K-π = 3/2(+) and 1/2(+) bandheads at 221.4- and 247.6-keV, and T-1/2 = 503(12) ps and 98(36) ps for the 1/2(-) and 3/2(-) states at 554.7- and 593.6-keV, members of the K-π = 1/2(-) band. The latter results consistently yield D(0) values of the order of 1.1 x 10-2 e·fm for three transitions connecting the K-π = 1/2(±) bands. The observed transition rates have been interpreted within the quasiparticle-phonon model with the inclusion of Coriolis coupling.
Description:24 pages, 5 tables, 5 figures.-- PACS nrs.: 21.10.−k; 21.10.Tg; 21.10.Re; 23.20.−g; 23.20.Lv; 27.90.+b.
Publisher version (URL):http://dx.doi.org/10.1016/S0375-9474(99)00307-3
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