C.E. Mandeville

Inelastic neutron scattering in Mn55

Abstract Gamma rays excited by inelastic neutron scattering in Mn55 have been studied. Coincidence methods have been used to observe those gamma rays which cascade through the 127 keV first excited state. Branching ratios have been measured for four levels, as well as the cross sections for excitation of each level. Theoretical calculations of the cross section, using a diffuse-edge potential well, give good agreement with the experiment, if appropriate spin values are assigned to each level.

Search for a long-lived radioisotope of neodymium☆

Abstract Neutron irradiated neodymium has been examined for the possible presence of long-lived activities in the rare earth region of undetermined elemental and isotopic assignment. No such long period radioelements were detectable. Scintillation counting methods and ion exchange olumns were employed to show that a composite contribution from three isotopes of europium may have been misinterpreted as evidence for the presence of a 1.7-yr. activity of neodymium. These elements are formed by neutron capture in europium and samarium present as impurities in neodymium.