Darryl E. Gustafson

High-spin states of 26Mg populated in the 12C(18O, α) reaction

Abstract The structure of 26 Mg has been investigated by means of the 12 C( 18 O, α) reaction. Several previously unknown states were populated between excitation energies of 0 to 16 MeV. Excitation functions were measured for 126 states for bombarding energies between 43.2 and 45.9 MeV in 300 keV steps at a lab angle of 7°. The experimental energy averaged differential cross sections were compared with statistical model calculations and good agreement was obtained for the states whose spins and parities were previously established. The statistical model calculations were used to suggest the spins and parities for the rest of the states. In particular, candidates for 6 + and 8 + states were interpreted as members of three rotational bands in 26 Mg: the ground-state band, the K = 2 + band based on the 2.938 MeV 2 + state, and a K = 0 + band based on the 3.588 MeV 0 + state. Back bending of the yrast band is observed and it is suggested that it may be due to band crossing of the ground-state and first excited K = 0 + bands.

Nuclear and Coulomb deformation parameters of 142Nd

Abstract Nuclear and Coulomb deformation parameters have been deduced from DWBA analyses of angular distributions of 67.5 MeV 13C ions inelastically scattered from 142Nd. Optical model parameters from fits of measured elastic scattering data were used with previously measured B(EL) values to determine initial deformation parameters. Comparison With the experimental data indicates that DWBA calculations can be used to understand the inelastic scattering from the nearly spherical nucleus 142Nd.