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Quadrupole deformed and octupole collective bands in Ra-228

AuthorsGulda, K.; Mach, H.; Aas, A. J.; García Borge, María José ; Burke, D. G.; Fogelberg, B.; Gietz, H.; Grant, I. S.; Hagebø, E.; Hill, P.; Hoff, P.; Kaffrell, N.; Kurcewicz, W.; Lindroth, A.; Løvhøiden, G.; Martínez Pérez, Trinitario; Mattsson, S.; Naumann, R. A.; Nybø, K.; Nyman, G.; Rubio, Berta ; Sánchez-Vega, M.; Taín, José Luis ; Taylor, R. B. E.; Tengblad, Olof ; Thorsteinsen, T. F.
KeywordsRadioactivity Fr-228, [from Th-232(p,4pln) and U-238(p,6p5n)]
Measured E-e, I(ce), T-1/2, βγγ(t), γγ coincidences
Deduced ICC
Rotational bands
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 Date15-Jun-1998
CitationNuclear Physics A 636(1): 28-46 (1998)
AbstractSpins and parities for collective states in Ra-228 have been determined from conversion electron measurements with a mini-orange β spectrometer. The fast-timing βγγ(t) method has been used to measure lifetimes of T(1/2) = 550(20) ps and 181(3) ps for the 2(1)(+) and 4(1)(+) members of the K = 0(+) band, and T(1/2) ≤ 7 ps and ≤ 6 ps for the 1(1)(-) and 3(1)(-) members of the K = 0(-) band, respectively. The quadrupole moments, Q(0), deduced from the B(E2;2(1)(+) --> 0(1)(+)) and B(E2;4(1)(+) -->2(1)(+)) rates are in good agreement with the previously measured value and the systematics of the region. However, the B(EI) rates of ≥ 4 x 10(-4) e(2)fm(2), which represent the first B(E1) measurements for this nucleus, are at least 25 times larger than the value previously suggested for Ra-228. The new results are consistent with the B(E1) rates recently measured for the neighbouring Ra-227 and reveal octupole correlations in Ra-228.
Description19 pages, 4 tables, 4 figures.-- PACS nrs.: 21.10.-k; 23.20.-g; 23.20.Lv; 23.20.Nx.
Publisher version (URL)http://dx.doi.org/10.1016/S0375-9474(98)00191-2
Appears in Collections:(CFMAC-IEM) Artículos
(IFIC) Artículos
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