Analog (p,n) cross sections of even-even palladium isotopes at 26 MeV.

Abstract

The differential cross sections for the (p,n) reaction to the ground-state and first ${2}^{+}$ excited analogs of the four even palladium isotopes (104, 106, 108, and 110) have been measured at a proton bombarding energy of 26 MeV. Integrated cross sections for the analog states deviate from the linear dependence on neutron excess as was previously found in other sets of isotopes, e.g., the molybdenum and zirconium isotopes. The observed dependence on deformation of the ground-state analog transition is in quantitative agreement with calculations, which include the inelastic couplings originally used to explain the molybdenum results. Detailed ten-coupled-channels calculations including the ground state, the one- and two-quadrupole phonon collectives states in Pd, and their analogs in Ag give excellent agreement simultaneously with proton elastic scattering, proton inelastic scattering to the first ${2}^{+}$ state, ground-state analog transitions, and ${2}^{+}$ analog-state transitions. The effect of the one-step isovector deformation was too small to be extracted from these data.