TEMPERATURE OF DY NUCLEI EXCITED TO 40-150 MEV

From the systematics of cross sections and neutron energies for (HI,xn) reactions, the average energy of the first emitted neutron has been obtained. These average energies reflect the nuclear temperature or level-density parameter. Average photon energies are also obtained and compared to calculated values of the lowest-lying levels for each spin. Reactions are considered which involve the emission of 3-11 neutrons from compound systems of 40-150 MeV and average spin 15-80. New experimental data are presented for the reactions Nd148(C12,5n)Dy155, Nd150(C12,5n)Dy157, and Nd150(C12,7n)Dy155. © 1969 The American Physical Society.