Abstract
A modification is made for the statistical theory of nuclear reactions so as to take account of the angular momenta of the nuclear states relevant in the reactions. Since the average ·values of the angular momenta of the compound nuclei formed by different projectiles at the same excitation energy will be different, various aspects of the decay process will also depend on the incident particles. For our purpose it is essential to take the spin dependence of the nuclear level density not as (21+1), but (2/+1)exp[-l(1+1)/2cT]. In this paper, the energy spectra of emitted particles are treated. The average kinetic energy of evaporating neutrons from a high spin nucleus becomes higher than twice the nuclear temperature T. It is shown that the anomalies found in the branching ratios or excitation functions in the heavy ion reactions can be explained by the angular momentum effect. The degree of these anomalies depends sensitively on the nuclear moment of inertia cfl2.
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