Abstract
Energy spectra and angular distributions were measured for protons emitted from Zn64 and Zn66 bombarded with 14.1 MeV neutrons. Any of level density formulae fits equally well the energy spectrum for backward angles. The constant temperature formula gives 1.22±0.07 MeV and 1.35±0.05 MeV as the nuclear temperatures of Cu64 and Cu66 respectively. Using the Lang level density formula, the level density parameters for Cu64 and Cu66 are given as 8.26±0.78 MeV−1 and 5.39±0.56 MeV−1 respectively. The proton angular distributions are concave and symmetric around 90°. Anisotropy is greater for higher energy protons. The anisotropy of lower-energy protons emitted through the (n, p) reaction is found to be comparable to the anisotropy of those emitted through the (n, np) reaction. The cross sections for the (n, p) and (n, np) reactions for Zn64 through compound process are 127±9 mb and 169±26 mb and those for Zn66 30.0±1.1 mb and 40.5±8.3 mb respectively. The direct (n, p) reaction for Zn64 has a cross section of about 5 mb.
