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Title Excited states in 217217Ra populated in the α decay of 221221Th
Author(s) Parr, E (West Scotland U. ; SUPA, UK) ; Smith, J F (West Scotland U. ; SUPA, UK) ; Greenlees, P T (Jyvaskyla U.) ; Auranen, K (Jyvaskyla U.) ; Chapman, R (West Scotland U. ; SUPA, UK) ; Cullen, D M (Manchester U.) ; Grahn, T (Jyvaskyla U.) ; Grocutt, L (West Scotland U. ; SUPA, UK) ; Herzáň, A (Jyvaskyla U. ; Bratislava, Inst. Phys.) ; Herzberg, R D (Liverpool U.) Visualizza tutti i 36 autori
Publication 2020
Number of pages 12
In: Phys. Rev. C 102 (2020) 054335
DOI 10.1103/PhysRevC.102.054335
Subject category Nuclear Physics - Experiment ; Nuclear Physics - Theory
Abstract Fine structure in the α decay of 2219022190Th, populating excited states in 2178821788Ra, was studied using αγ-coincidence spectroscopy. Two α-decay branches from 221221Th have been newly observed, with Eα(keV)[bα(%)]=7951(8)[0.14(3)]Eα(keV)[bα(%)]=7951(8)[0.14(3)] and 8247(3)[1.51(12)]8247(3)[1.51(12)], together with three previously known branches. Also, two new states in 217217Ra were identified at E=177E=177 and 227 keV. The ground-state configurations of the odd-AA, N=131N=131 transitional isotones above 208208Pb are interpreted from their α-decay fine structure systematics and considered in terms of predictions using spherical shell and reflection-asymmetric models.
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