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Quadrupole collectivity in silicon isotopes approaching neutron number
2007
Physics Letters B
Preserved Fulltext
Quadrupole deformation parameters, |β 2,(p,p ) |, have been deduced for 36, 38, 40 Si from measured inelastic proton-scattering cross sections. Due to the strong Z = 14 subshell gap, low-lying quadrupole collectivity in these nuclei is attributed to the excitation of valence neutrons. Enhanced collectivity at N = 26 indicates a reduced N = 28 shell gap at large neutron excess in this chain of isotopes. Data are compared to large-scale shell-model calculations and prior Coulomb excitation measurements on 36,38 Si.
doi:10.1016/j.physletb.2007.07.005
fatcat:gj7wck3r2zf5xhlqqg2widxbmu