Fine structure in the +¦ decay of Th90221, populating excited states in Ra88217, was studied using +¦+¦-coincidence spectroscopy. Two +¦-decay branches from Th221 have been newly observed, with E+¦(keV)[b+¦(%)]=7951(8)[0.14(3)] and 8247(3)[1.51(12)], together with three previously known branches. Also, two new states in Ra217 were identified at E = 177 and 227 keV. The ground-state configurations of the odd-A, N = 131 transitional isotones above Pb208 are interpreted from their +¦-decay fine structure systematics and considered in terms of predictions using spherical shell and reflection-asymmetric models.
Excited states in Ra 217 populated in the +¦ decay of Th 221
Mengoni D.;
2020
Abstract
Fine structure in the +¦ decay of Th90221, populating excited states in Ra88217, was studied using +¦+¦-coincidence spectroscopy. Two +¦-decay branches from Th221 have been newly observed, with E+¦(keV)[b+¦(%)]=7951(8)[0.14(3)] and 8247(3)[1.51(12)], together with three previously known branches. Also, two new states in Ra217 were identified at E = 177 and 227 keV. The ground-state configurations of the odd-A, N = 131 transitional isotones above Pb208 are interpreted from their +¦-decay fine structure systematics and considered in terms of predictions using spherical shell and reflection-asymmetric models.File in questo prodotto:
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