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Closed Access item Octupole correlations in Ra-229

Authors:Fraile, Luis M.
Aas, A. J.
García Borge, María José
Fogelberg, B.
García Raffi, Luis M.
Grant, I. S.
Gulda, K.
Hagebø, E.
Kurcewicz, W.
Kvasil, J.
Løvhøiden, G.
Mach, H.
Mackova, A.
Martínez, T.
Rubio, Berta
Taín, José Luis
Teijeiro, A. G.
Tengblad, Olof
Thorsteinsen, T. F.
Keywords:Radioactivity 229/87Fr [from 238/92U (p,6R4n) mass separation], Measured E-γ, I-γ, I(CE), γ-γ coincidences, T(1/2), Deduced 229/88Ra levels, ICC multipolarities, I-π, rotational bands, B(XL), Ge, Si(Li), BaF2, detectors, Mini-Orange spectrometer, Fast timing βγγ(t) method, Quasiparticle-plus-phonon model, [PACS] Lifetimes, widths, [PACS] Electromagnetic transitions, [PACS] Collective levels, [PACS] Properties of specific nuclei listed by mass ranges: A ≥ 220
Issue Date:4-Oct-1999
Citation:Nuclear Physics A 657(4): 355-390 (1999)
Abstract:The structure of Ra-229 has been studied in the β- decay of Fr-229. Spins and parities have been determined from the conversion electron measurements, while half-lives for the 137.5, 142.7, 168.8, 213.0 and 479.0 keV levels have been measured in the ps and ns ranges via the fast timing βγγ(t) method. Our data confirm the previous results and enrich the knowledge of the structure of this nucleus by 25 new states and several strong transitions. Structural similarities are established between Ra-229 and its N = 141 isotone Th-231. The experimental results are compared with the theoretical predictions of the quasiparticle-phonon model with inclusion of Coriolis coupling. The reduced transition probabilities, and especially the moderately fast B(E1) rate for the 137.5 keV transition connecting the band-heads of the K-π = 5/2(±) parity doublet bands, reveal the presence of significant octupole correlations in Ra-229.
Description:36 pages, 5 tables, 9 figures.-- PACS nrs.: 23.20.−g; 21.10.Tg; 21.10.Re; 27.90.+b.
Publisher version (URL):http://dx.doi.org/10.1016/S0375-9474(99)00330-9
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