Study of the Reactions Pr141(C12, 4n)Tb149 and Te130(C12, 5n)Ce137m by Means of Recoil Techniques

Abstract

The reactions ${\mathrm{Pr}}^{141}({\mathrm{C}}^{12}, 4n){\mathrm{Tb}}^{149}$ and ${\mathrm{Te}}^{130}({\mathrm{C}}^{12}, 5n){\mathrm{Ce}}^{137m}$ were examined by means of recoil techniques. The experimental angular distributions were compared with distributions calculated by a Monte Carlo method, based upon the compound nucleus and statistical models, with a neutron angular distribution of the form $W\left(\theta \right)d\Omega =(A+B{cos}^2\theta )d\Omega$. The results from the ${\mathrm{Pr}}^{141}({\mathrm{C}}^{12}, 4n)$ reaction are in agreement with the simple theory. The ${\mathrm{Te}}^{130}({\mathrm{C}}^{12}, 5n)$ data can be explained by formation of a compound nucleus which de-excites with enhanced probability for gamma emission.