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Título

The nuclear structure of Fr-227

Autor 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.
Palabras clave 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)
Fecha de publicación 18-ago-1997
EditorElsevier
Citación Nuclear Physics A 621(4): 827-852 (1997)
ResumenThe 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.
Descripción 26 pages, 4 tables, 10 figures.-- PACS nrs.: 21.10.−k; 23.20.−g; 23.20.Lv; 23.20.Nx.
Versión del editorhttp://dx.doi.org/10.1016/S0375-9474(97)00190-5
URI http://hdl.handle.net/10261/10242
DOI10.1016/S0375-9474(97)00190-5
ISSN0375-9474
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