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Core-excited states and core-polarization effects in 210At and 211At

✍ Scribed by S. Bayer; A.P. Byrne; G.D. Dracoulis; A.M. Baxter; T. Kibédi; F.G. Kondev

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
847 KB
Volume
694
Category
Article
ISSN
0375-9474

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✦ Synopsis

Excited states in the nuclei 210 At and 211 At have been studied using 208 Pb( 7 Li, xn) reactions. Detailed spectroscopy of levels up to 30 h has been achieved. New isomeric levels arising from core-excited states were observed, with the highest-lying isomers attributed to a coupling of the π[h 2 9/2 i 13/2 ] configuration to double neutron-particle-hole excitations. Clear relationships between the states observed in 210 At and 211 At 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.

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