Lifetime measurements in Re-166: collective versus magnetic rotation

H.J. Li, B. Cederwall, M. Doncel, J. Peng, Q.B. Chen, S.Q. Zhang, P.W. Zhao, J. Meng, T. Bäck, U. Jakobsson, K. Auranen, S. Bönig, M. Drummond, T. Grahn, P. Greenlees, A. Herzáň, D.T. Joss, R. Julin, S. Juutinen, J. KonkiT. Kröll, M. Leino, C. McPeake, D. O'Donnell, R.D. Page, J. Pakarinen, J. Partanen, P. Peura, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Sarén, B. Sayğı, C. Scholey, J. Sorri, S. Stolze, M.J. Taylor, A. Thornthwaite, J. Uusitalo, Z.G. Xiao

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2 Citations (Scopus)


Lifetimes of excited states in the neutron-deficient odd-odd nucleus Re-166 have been measured for the first time using the recoil distance Doppler-shift method. The measured lifetime for the (8(-)) state; tau = 480 (80) ps, enabled an assessment of the multipolarities of the gamma rays depopulating this state. Information on electromagnetic transition strengths were deduced for the gamma-ray transitions from the (9(-)), (10(-)), and (11(-)) states, and in the case of the (10(-)) and (11(-)) states limits on the B (M1) and B(E2) strengths were estimated. The results are compared with total Routhian surface predictions and semiclassical calculations. Tilted-axis cranking calculations based on a relativistic mean-field approach (TAC-RMF) have also been performed in order to test the possibility of magnetic rotation in the 166Re nucleus. While the TAC-RMF calculations predict a quadrupole-deformed nuclear shape with similar beta(2) deformation as obtained by using the TRS model, it was found that the experimental electromagnetic transition rates are in better agreement with a collective -rotational description.
Original languageEnglish
Article number034309
JournalPhysical Review C
Issue number3
Publication statusPublished - 8 Mar 2016
Externally publishedYes


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