Fission of 209Bi and 26Au Nuclei Induced by 30 MeV Protons

Abstract

Thin targets of 209Bi and 197Au were bombarded with 30 MeV protons at the Cyclotron Department of Nuclear Research Center for Agriculture and Medicine (NRCAM). Correlated measurements of kinetic energies of fission fragment pairs, and their time-of-flights were made using pair spectrometry. The fission cross sections, fragment mass distributions, and total kinetic energy distributions of the fragments were measured in our experiment. The accurate values of cross sections for fission of 209Bi and 197 Au nuclei with 30MeV protons were obtained to be 1,100±100 and 62±5.6 μb, respectively. The cross section of 209Bi fission with its associated error, through using this method, has not been reported previously. The interpretation in terms of liquid-drop model of fissioning nucleus 210Po at the excitation energy of 35 MeV was confirmed by the dispersion of the distribution in fragment mass for bismuth fission.