Fine structure in the α decay of high-spin isomers in Lu155 and Hf156

E Parr,J Henderson,S Juutinen,C Scholey,D T Joss,R Julin,J Partanen,R D Page,M Sandzelius,C Mcpeake,A Herzáň,M Labiche,K Auranen,P Ruotsalainen,P Papadakis,J F Smith,A Thornthwaite,P Rahkila,L Capponi,U Jakobsson,T Grahn,F A Ali,J Uusitalo,J Konki,J Sarén,P Peura,P T Greenlees,J Sorri,J P Revill,M Leino,J Pakarinen,M Smoleń ,D O’donnell ,Sanna Stolze ,P Mason ,John Simpson

doi:10.1103/physrevc.98.024321

Abstract

Fine structure in the α decay of high-spin isomers in Lu155(25/2−) and Hf156(8+) has been studied for the first time using αγ-coincidence analysis. Three new α decays from Lu155(25/2−) and two from Hf156(8+) have been identified, populating seniority s>1 states in the N=82 nuclei Tm151 and Yb152, 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 Pb208 region.Received 4 July 2018DOI:https://doi.org/10.1103/PhysRevC.98.024321©2018 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasAlpha decayEnergy levels & level densitiesIsomer decaysLifetimes & widthsNuclear spin & parityShell modelNuclear Physics

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