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dc.contributor.authorAas, A. J.-
dc.contributor.authorMach, H.-
dc.contributor.authorKvasil, J.-
dc.contributor.authorGarcía Borge, María José-
dc.contributor.authorFogelberg, B.-
dc.contributor.authorGrant, I. S.-
dc.contributor.authorGulda, K.-
dc.contributor.authorHagebø, E.-
dc.contributor.authorHoff, P.-
dc.contributor.authorKurcewicz, W.-
dc.contributor.authorLindroth, A.-
dc.contributor.authorLøvhøiden, G.-
dc.contributor.authorMackova, A.-
dc.contributor.authorMartínez Pérez, Trinitario-
dc.contributor.authorRubio, Berta-
dc.contributor.authorSánchez-Vega, M.-
dc.contributor.authorSmith, J. F.-
dc.contributor.authorTaín, José Luis-
dc.contributor.authorTaylor, R. B. E.-
dc.contributor.authorTengblad, Olof-
dc.contributor.authorThorsteinsen, T. F.-
dc.identifier.citationNuclear Physics A 654(3-4): 499-522 (1999)-
dc.description24 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.-
dc.description.abstractThe 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.en_US
dc.description.sponsorshipThis work was supported in part by the Research Council of Norway, the Nansen Foundation, the Swedish Natural Science Research Council, the Polish Scientific Research Committee under grant KBN-2-P03B-001-11, the UK Engineering and Physical Sciences Research Council, the Spanish CICYT 'Plan Nacional de Altas Energías' under contracts AEN96-1679, One of us, (A.J.A.), would like to thank the OSIRIS group at Studsvik in Sweden for their generous hospitality.en_US
dc.format.extent1283063 bytes-
dc.subjectMeasured Eγ, Iγ, γ-γ coincidences, T(1/2)en_US
dc.subjectDeduced Th-231 levelsen_US
dc.subjectFast-timing βγγ(t) methoden_US
dc.subjectRotational bandsen_US
dc.subjectQuasiparticle-plus-phonon modelen_US
dc.subject[PACS] Properties of nuclei; nuclear energy levels-
dc.subject[PACS] Lifetimes, widths-
dc.subject[PACS] Collective levels-
dc.subject[PACS] Electromagnetic transitions-
dc.subject[PACS] γ transitions and level energies-
dc.subject[PACS] Properties of specific nuclei listed by mass ranges (A ≥ 220 )-
dc.titleQuenched E1 transition rates in Th-231-
dc.description.peerreviewedPeer revieweden_US
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