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oai:digital.csic.es:10261/10057
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col_10261_388
Quenched E1 transition rates in Th-231
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 Pérez, Trinitario
Rubio, Berta
Sánchez-Vega, M.
Smith, J. F.
Taín, José Luis
Taylor, R. B. E.
Tengblad, Olof
Thorsteinsen, T. F.
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 )
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.
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.
2009-01-28T12:34:05Z
2009-01-28T12:34:05Z
1999-08-02
artículo
Nuclear Physics A 654(3-4): 499-522 (1999)
0375-9474
http://hdl.handle.net/10261/10057
10.1016/S0375-9474(99)00307-3
eng
http://dx.doi.org/10.1016/S0375-9474(99)00307-3
closedAccess
Elsevier