Views provided by UsageCountsThe nuclear structure of Th-229
Gulda, K.; Kurcewicz, W.; Aas, A. J.; García Borge, María José; Burke, D. G.; Fogelberg, B.; Grant, I. S.; +12 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 Pérez, Trinitario; Nyman, G.; Rubio, Berta; Taín, José Luis; Tengblad, Olof; Thorsteinsen, T. F.;
The nuclear structure of Th-229
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.
This work was supported in part by the Polish Scientific Research Committee, the Swedish Natural Science Research Council, the Norwegian Research Council, the Spanish CICYT under contracts AEN94–0833-C02–02 and AEN96–1662, the Canadian Natural Sciences and Engineering Research Council, the Grant Agency of Czech Republic under the contract 202/99/1718, and UK Engineering and Physical Science Research Council.
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.
Peer reviewed
Spain
Mini-orange spectrometer, Ge,, Mass separation, Th-229 deduced levels, ICC, multipolarities, I-π, rotational bands, B(XL), dipole moments, nuclear energy levels, [PACS] γ transitions and level energies, Radioactivity Th-229 from decay chain of Fr-229, Fr-229 from Th-232(p,4p) and U-238(p,6p4n), Plastic, [PACS] Internal conversion and extranuclear effects (including Auger electrons and internal bremsstrahlung), [PACS] Properties of nuclei; nuclear energy levels, [PACS] Electromagnetic transitions, [PACS] Properties of nuclei, Si(Li), BaF2 detectors, Measured E-γ, I-γ, Ee, I(ce), T(1/2), ATD βγγ(t), eγ-coincidence, γγ-coincidence
Mini-orange spectrometer, Ge,, Mass separation, Th-229 deduced levels, ICC, multipolarities, I-π, rotational bands, B(XL), dipole moments, nuclear energy levels, [PACS] γ transitions and level energies, Radioactivity Th-229 from decay chain of Fr-229, Fr-229 from Th-232(p,4p) and U-238(p,6p4n), Plastic, [PACS] Internal conversion and extranuclear effects (including Auger electrons and internal bremsstrahlung), [PACS] Properties of nuclei; nuclear energy levels, [PACS] Electromagnetic transitions, [PACS] Properties of nuclei, Si(Li), BaF2 detectors, Measured E-γ, I-γ, Ee, I(ce), T(1/2), ATD βγγ(t), eγ-coincidence, γγ-coincidence
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