Angular Distributions of the Fast-Neutron-Induced Gamma Rays from Calcium

An investigation has been made of the neutron-induced gamma rays from natural calcium for incident neutron energies in the range from 3.5 to 5.0 MeV. Gamma rays which result from the ($n, n^{\prime }\gamma$), ($n, p^{\prime }\gamma$), and ($n, {\alpha }^{\prime }\gamma$) reactions in ${\mathrm{Ca}}^{40}$ and from the ($n, n^{\prime }\gamma$) reaction in ${\mathrm{Ca}}^{44}$ are observed. The 90° differential gamma-ray production cross sections are presented for gamma rays with energies of 0.51, 0.768, 1.158, 3.730, and 3.900 MeV. The angular distributions of the 0.768-, 3.730-, and 3.900-MeV gamma rays are also given at incident neutron energies of 4.2, 4.4, and 5.0 MeV. The experimental data are well described by the Satchler formalism.