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Closed Access item The nuclear structure of Th-229

Authors:Gulda, K.
Kurcewicz, W.
Aas, A. J.
García Borge, María José
Burke, D. G.
Fogelberg, B.
Grant, I. S.
Hagebø, E.
Kaffrell, N.
Kvasil, J.
Løvhøiden, G.
Mach, H.
Mackova, A.
Martínez, T.
Nyman, G.
Rubio, Berta
Taín, José Luis
Tengblad, Olof
Thorsteinsen, T. F.
Keywords:Radioactivity Th-229 from decay chain of Fr-229, Fr-229 from Th-232(p,4p) and U-238(p,6p4n), Mass separation, Measured E-γ, I-γ, Ee, I(ce), T(1/2), ATD βγγ(t), eγ-coincidence, γγ-coincidence, Th-229 deduced levels, ICC, multipolarities, I-π, rotational bands, B(XL), dipole moments, Ge,, Si(Li), Plastic, BaF2 detectors, Mini-orange spectrometer, [PACS] Properties of nuclei; nuclear energy levels, [PACS] Electromagnetic transitions, [PACS] γ transitions and level energies, [PACS] Internal conversion and extranuclear effects (including Auger electrons and internal bremsstrahlung)
Issue Date:20-May-2002
Publisher:Elsevier
Citation:Nuclear Physics A 703(1-2): 45–69 (2002)
Abstract:The γ-rays following the β- decay of Ac-229 have been investigated by means of γ-ray singles and γγ-coincidence measurements using Ge detectors. Multipolarities of 40 transitions in Th-229 have been established by measuring conversion electrons with a mini-orange electron spectrometer. The half-lives of the 146.35, 164.53 and 261.96 keV levels have been measured using the advanced time delayed betagammagamma(t) method. The low-lying states in Th-229 and observed transition rates have been interpreted within the quasiparticle-phonon model with inclusion of Coriolis coupling. Two octupole correlated parity partner bands, with K-π = 5/2(±) and K-π = 3/2(±), were identified in Th-229.
Description:25 pages, 5 tables, 9 figures.-- PACS nrs.: 21.10.-k; 23.20.-g; 23.20.Lv; 23.20.Nx.-- Available online Dec 5, 2001.
Publisher version (URL):http://dx.doi.org/10.1016/S0375-9474(01)01456-7
URI:http://hdl.handle.net/10261/9729
ISSN:0375-9474
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