6533b870fe1ef96bd12cfee9

RESEARCH PRODUCT

Excited states in 217Ra populated in the α decay of 221Th

E. ParrJ. F. SmithP. T. GreenleesK. AuranenR. ChapmanD. M. CullenT. GrahnL. GrocuttA. HerzáňR.-d. HerzbergD. HodgeU. JakobssonR. JulinS. JuutinenJ. KonkiC. McpeakeD. MengoniA. K. MistryK. F. MulhollandG. G. O'neillJ. PakarinenP. PapadakisJ. PartanenP. PeuraP. RahkilaP. RuotsalainenM. SandzeliusJ. SarénM. ScheckC. ScholeyM. SicilianoM. SmolenJ. SorriS. StolzeM. J. TaylorJ. Uusitalo

subject

alpha decayenergy levels and level densitiesydinfysiikkanuclear structure and decays

description

Fine structure in the α decay of 22190Th, populating excited states in 21788Ra, was studied using αγ-coincidence spectroscopy. Two α-decay branches from 221Th have been newly observed, with Eα(keV)[bα(%)]=7951(8)[0.14(3)] and 8247(3)[1.51(12)], together with three previously known branches. Also, two new states in 217Ra were identified at E = 177 and 227 keV. The ground-state configurations of the odd-A, N = 131 transitional isotones above 208Pb are interpreted from their α-decay fine structure systematics and considered in terms of predictions using spherical shell and reflection-asymmetric models. peerReviewed

http://urn.fi/URN:NBN:fi:jyu-202012076933