Title: Deformation increase of high-spin core-excited isomers in the astatine nuclei
Authors: Scheveneels, G ×
Hardeman, F
Neyens, Gerda
Coussement, Romain #
Issue Date: Jun-1991
Publisher: American physical soc
Series Title: Physical Review C vol:43 issue:6 pages:2566-2571
Abstract: Quadrupole moments of six high-spin isomers in the At isotopes have been measured with the level-mixing-spectroscopy method: At-208(16-), At-209(29/2+), At-210(19+, 15-). At-211 (39/2-, 29/2+). The results show that level mixing spectroscopy is a promising technique to determine quadrupole moments of isomers that are difficult to measure by other in-beam hyperfine interaction methods. A large increase of the quadrupole moment is observed if neutrons are excited across or removed from the N = 126 shell closure. This behavior is explained in terms of an enhanced core softness for fewer core neutrons; the aligned valence particles, moving in equatorial orbits, then easily polarize the core towards oblate deformation.
ISSN: 0556-2813
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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