E3 and M2 transition strengths in Bi-209(83)

O. J. Roberts, C.R. Niţă, A. M. Bruce, N. Mărginean, D. Bucurescu, D. Deleanu, D. Filipescu, N. M. Florea, I. Gheorghe, D. Ghiţă, T. Glodariu, R. Lica, R. Mărginean, C. Mihai, A. Negret, T. Sava, L. Stroe, R. Şuvăilă, S. Toma, T. AlharbiT. Alexander, S. Aydin, B. A. Brown, F. Browne, R. J. Carroll, K. Mulholland, Zs. Podolyák, P. H. Regan, J. F. Smith, M. Smolen, C. M. Townsley

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The 1i(13/2) -> 1h(9/2) (M2) and 3s(1/2) -> 2f(7/2) (E3) reduced proton transition probabilities in Bi-209(83) have been determined from the direct half-life measurements of the 13/2(1)(+) and 1/2(1)(+) states using the Romanian array for gamma-ray SPectroscopy in HEavy ion REactions (RoSPHERE). The 13/2(1)(+) and 1/2(1)(+) states were found to have T-1/2 = 0.120(15) ns and T-1/2 = 9.02(24) ns respectively. Angular distribution measurements were used to determine an E3/M2 mixing ratio of delta = -0.184(13) for the 1609 keV gamma-ray transition deexciting the 13/2(1)(+) state. This value for delta was combined with the measured half-life to give reduced transition probabilities of B(E3, 13/2(1)(+) -> 9/2(1)(-)) = 12(2) x 10(3) e(2) fm(6) and B(M2, 13/2(1)(+) -> 9/2(1)(-)) = 38(5)mu(2)(N) fm(2). These values are in good agreement with calculations within the finite Fermi system. The extracted value of B(E3, 1/2(1)(+) -> 7/2(1)(-)) = 6.3(2) x 10(3) e(2) fm(6) can be explained by a small (similar to 6%) admixture in the wave function of the 1/2(1)(+) state.
Original languageEnglish
Article number014309
JournalPhysical Review C
Publication statusPublished - 14 Jan 2016


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