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Title: The nuclear structure of Fr-227
Authors: Kurcewicz, W., Grant, I. S., Gulda, K., Aas, A. J., Billowes, J., García Borge, María José, Burke, D. G., Butler, P. A., Cocks, J. F. C., Fogelberg, B., Freeman, S. J., Jones, G. D., Hagebø, E., Hoff, P., Hønsi, J., Lindroth, A., Løvhøiden, G., Mach, H., Martinez, T., Naumann, R. A., Nybø, K., Nyman, G., Ravn, H., Rubio, Berta, Simpson, J., Smith, A. G., Smith, J. F., Steffensen, K., Taín, José Luis, Tengblad, Olof, Thorsteinsen, T. F.
Keywords: Radioactivity Rn-227(β-) [from Th-232(p,n5p),E = 1 GeV]
Measured Eγ, Iγ, I(ce), T-1/2, βγγ(t), γγ coin
Fr-227 deduced levels, J, π, ICC, γ-multipolarity, rotational bands, B(λ)
Ge, Si(Li), BGO, 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: 18-Aug-1997
Publisher: Elsevier
Abstract: The γ-rays following the β- decay of Rn-227 have been investigated by means of γ-ray singles and γγ-coincidence measurements using an array of 12 Compton-suppressed Ge detectors. The fast-timing βγγ(t) method has been used to measure six level lifetimes. Multipolarities of 32 transitions in Fr-227 have been established by measuring conversion electrons with a mini-orange electron spectrometer. Most of the observed transitions have been placed in a level scheme comprising 38 excited states of Fr-227, The low-lying levels are interpreted in terms of seven rotational bands. The observed E1 strengths for two transitions connecting the K-π = 3/2(±) bands are consistent with the transitional character of Fr-227, and confirm the presence of octupole correlations in this nucleus.
Description: 26 pages, 4 tables, 10 figures.-- PACS nrs.: 21.10.−k; 23.20.−g; 23.20.Lv; 23.20.Nx.
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ISSN: 0375-9474
???metadata.dc.identifier.doi???: 10.1016/S0375-9474(97)00190-5
Citation: Nuclear Physics A 621(4): 827-852 (1997)
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