Identification of the Jπ=1 state in 218Ra populated via α decay of 222Th

Edward Parr, J.F. Smith, P.T. Greenlees, Magdalena Smolen, P. Papadakis, K. Auranen, R. Chapman, D.M. Cullen, T. Grahn, L. Grocutt, A. Herzáň, R.-D. Herzberg, D. Hodge, U. Jakobsson, R. Julin, S. Juutinen, J. Konki, M. Leino, C. McPeake, D. MengoniA.K. Mistry, K.F. Mulholland, G.G. O'Neill, J. Pakarinen, J. Partanen, P. Peura, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Sarén, M. Scheck, C. Scholey, J. Sorri, S. Stolze, M.J. Taylor, J. Uusitalo

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The α decay of 222Th populating the low-lying Jπ=3 state, and also a proposed 1 state, in 218Ra has been observed. The observations suggest an excitation energy of 853 keV for the 1 state, which is 60 keV above the 3 state. The hindrance factors of these α decays give a possible boundary to the region of ground-state octupole deformation in the light-actinide nuclei. The relative positions of the Jπ=1 and 3 states suggest they are produced by an octupole-vibrational mechanism, as opposed to α clustering or rotations of a reflection-asymmetric octupole-deformed shape.
Original languageEnglish
Article number014307
Number of pages12
JournalPhysical Review C
Issue number1
Publication statusPublished - 12 Jul 2016


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