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Persistence of octupole correlations in Ra-231

AutorFraile, Luis M. ; García Borge, María José ; Mach, H.; Boutami, Rafik ; Aas, A. J.; Fogelberg, B.; García Raffi, Luis M. ; Grant, I. S.; Gulda, K.; Hagebø, E.; Kurcewicz, W.; Kvasil, J.; López, M. J.; Løvhøiden, G.; Martínez Pérez, Trinitario; Rubio, Berta ; Taín, José Luis ; Tengblad, Olof
Palabras claveRadioactivity, Fr-231(87)[from U-238(92)(p,6p2n) mass separation]
Measured E gamma, I gamma, I(CE), gamma-gamma coincidences
Gamma-e(-) coincidences, T-1/2
Deduced Ra-231(88) levels, ICC multipolarities, spin-parities, rotational bands, B(XL)
Advanced time delayed beta gamma gamma(t) method
Quasiparticle-plus-phonon model
Ge, Si(Li), BaF2 detectors
MINI-ORANGE spectrometer
[PACS] Properties of specific nuclei listed by mass ranges: A ≥ 220
[PACS] Collective levels
[PACS] Lifetimes, widths
[PACS] Electromagnetic transitions
Fecha de publicación19-mar-2001
CitaciónNuclear Physics A 686(1-4): 71–108 (2001)
ResumenThe structure of Ra-231, the heaviest odd Ra nucleus currently accessible for detailed spectroscopic investigation, has been studied in the beta (-) decay of Fr-231. The main purpose has been to verify whether fast B(E1) rates and significant octupole correlations recently established in Ra-229 persist in Ra-231. The excited stares in Ra-231 have been determined for the first time. Spins and parities have been deduced from conversion electron measurements, while level half-lives in the ps and ns ranges have been measured with the Advanced Time Delayed beta gamma gamma (t) method. The moderately fast B(E1) rates found For transitions connecting the lowest-lying K-pi = 5/2(+/-) and K-pi = 1/2(+/-) hands, reveal the persistence of octupole collective effects in Ra-231, although the B(E1) rates are lower than in Ra-229. These findings reinforce the differences in the B(E1) systematics between isotonic Ra and Th nuclei.
Descripción38 pages, 8 tables, 9 figures.-- PACS nrs.: 23.20.-g; 21.10.Tg; 21.10.Re; 27.90.+b.-- Printed version published Apr 9, 2001.
Versión del editorhttp://dx.doi.org/10.1016/S0375-9474(00)00572-8
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