Identification of the J = 1− state in 218Ra populated via decay of 222Th

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

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    The α decay of Th222 populating the low-lying Jπ=3− state, and also a proposed 1− state, in Ra218 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
    JournalPhysical Review C (Nuclear Physics)
    Publication statusPublished - 12 Jul 2016


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