Journal
NUCLEAR PHYSICS A
Volume 694, Issue 1-2, Pages 3-62Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0375-9474(01)00922-8
Keywords
Pb-208 (Li-7, xn); E=32-44; 53-56 MeV; measured gamma gamma(t); X gamma(t); E-gamma; At-210 and At-211 deduced levels; J(pi); tau(m); reduced transition probabilities; enriched targets; pulsed-beam; Compton suppressed Ge detectors; At-210; At-211; calculated levels; configurations; B(lambda); semiempirical shell-model calculations; yrast configurations; core-excitation; residual interactions; enhanced transitions; octupole coupling; core-polarization
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Excited states in the nuclei At-210 and At-211 have been studied using Pb-208(Li-7, xn) reactions. Detailed spectroscopy of levels up to 30 (h) over bar has been achieved. New isomeric levels arising from core-excited states were observed, with the highest-lying isomers attributed to a coupling of the pi [h(9/2)(2)i(13/2)] configuration to double neutron-particle-hole excitations. Clear relationships between the states observed in At-210 and At-211 were identified. Semiempirical shell-model calculations reproduce very well the yrast states in both nuclei. Uncertainty in the modeling of core-polarization was seen as a limiting factor in the calculation of accurate level energies for core-excited states. (C) 2001 Elsevier Science B.V. All rights reserved.
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