Fine structure in the alpha decay of high-spin isomers in Lu-155 and Hf-156

E. Parr, R.D. Page, D.T. Joss, F.A. Ali, K. Auranen, L. Capponi, T. Grahn, P.T. Greenlees, J. Henderson, A. Herzan, U. Jakobsson, R. Julin, S. Juutinen, J. Konki, M. Labiche, M. Leino, P.J.R. Mason, C. McPeake, D. O'Donnell, J. PakarinenP. Papadakis, J. Partanen, P. Peura, P. Rahkila, J.P. Revill, P. Ruotsalainen, M. Sandzelius, J. Saren, C. Scholey, J. Simpson, J.F. Smith, M. Smolen, J. Sorri, S. Stolze, A. Thornthwaite, J. Uusitalo

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Fine structure in the α decay of high-spin isomers in 155Lu(25/2−) and 156Hf(8+) has been studied for the first time using αγ-coincidence analysis. Three new α decays from 155Lu(25/2−) and two from 156Hf(8+) have been identified, populating seniority s>1 states in the N=82 nuclei 151Tm and 152Yb, respectively. The reduced hindrance factors of the α decays support the previous configuration assignments of the populated states. This is the first observation of states with excitation energy greater than 1.5 MeV being populated following α decay in nuclei outside of the 208Pb region.
Original languageEnglish
Article number024321
JournalPhysical Review C
Issue number2
Publication statusPublished - 29 Aug 2018


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