Cross sections in theCo59(n, n′γ)Co59reaction from 1.1 to 3.3 MeV

Abstract

The $^{59}\mathrm{Co}(n, {n}^{\ensuremath{'}}\ensuremath{\gamma})^{59}\mathrm{Co}$ reaction was employed to obtain neutron inelastic scattering cross sections for nineteen levels in $^{59}\mathrm{Co}$ in the incident neutron energy range 1.11 to 3.32 MeV. These cross sections were deduced from measured $\ensuremath{\gamma}$-ray production cross sections for thirty-six $\ensuremath{\gamma}$ rays observed in the decay of $^{59}\mathrm{Co}$ using a 40 ${\mathrm{cm}}^{3}$Ge (Li) detector. Branching ratios have been determined for forty transitions from levels up to 3016 keV. The pulsed-beam time-of-flight technique was employed for background reduction. The data were corrected for neutron multiple scattering and neutron and $\ensuremath{\gamma}$-ray attenuation effects. The neutron inelastic scattering cross section data for the nineteen levels are compared to compound nucleus statistical model calculations. On the basis of these calculations and the branching ratios previously assigned spins for states up to 2062 keV have been confirmed. Spin assignments are made for the following states: $2087 \mathrm{keV}(\frac{5}{2} or \frac{7}{2})$, $2153(\frac{11}{2} or \frac{13}{2})$, $2183(\frac{5}{2}, \frac{7}{2}, or \frac{9}{2})$, $2206(\frac{3}{2}, \frac{5}{2}, or \frac{7}{2})$, $2395(\frac{7}{2}, \frac{9}{2}, or \frac{11}{2})$, $2479(\frac{3}{2}, \frac{5}{2}, or \frac{7}{2})$, $2542(\frac{3}{2}, \frac{5}{2}, or \frac{7}{2})$, $2585(\frac{7}{2} or \frac{9}{2})$, $2713(\frac{1}{2} or \frac{3}{2})$, $2781(\frac{3}{2} or \frac{5}{2})$, $2824(\frac{3}{2}\ensuremath{-}\frac{9}{2})$, and $2962 \mathrm{keV}(\frac{3}{2}, \frac{5}{2}, or \frac{7}{2})$.NUCLEAR REACTIONS $^{59}\mathrm{Co}(n, {n}^{\ensuremath{'}}\ensuremath{\gamma})$, ${E}_{n}=1.1\ensuremath{-}3.3$ MeV; measured $\ensuremath{\sigma}(E; {E}_{\ensuremath{\gamma}}, \ensuremath{\theta})$. Deduced $^{59}\mathrm{Co}(n, {n}^{\ensuremath{'}})$ cross sections, $^{59}\mathrm{Co}$ decay scheme, $J$, $\ensuremath{\gamma}$-decay branching ratios.