Inelastic Alpha-Particle Scattering byMn55andCo59

Abstract

Angular distributions of 43-MeV alpha particles scattered by ${\mathrm{Mn}}^{55}$ and ${\mathrm{Co}}^{59}$ have been derived. The angular distributions for reactions leading to the levels at 0.98 and 1.88 MeV in ${\mathrm{Mn}}^{55}$ are out of phase with elastic scattering. The ${\mathrm{Mn}}^{55}$ spectra lack the very strong collective quadrupole group. Eight peaks from ${\mathrm{Mn}}^{55}$ and seven from ${\mathrm{Co}}^{59}$ were resolved. The ${\mathrm{Co}}^{59}$ spectra are similar to those from ${\mathrm{Ni}}^{60}$, except that the excitation energies are slightly smaller in ${\mathrm{Co}}^{59}$. The collective quadrupole group in ${\mathrm{Co}}^{59}$ is at least 0.3 MeV wide.