Abstract
The reaction 31P(p, α) 28Si has been investigated for alpha particles detected at 13 angles in the proton energy range 8.50–12.30 MeV, corresponding to excitations in the compound nucleus 32S of between 17.36 and 21.16 MeV. The excitation functions were measured in ten keV steps. The two α-particles groups α 0 and α 1 were recorded. All of the data, i.e. 26 excitation functions each of 380 points, are quantitatively in agreement with the Hauser-Feshbach statistical assumptions including statistical fluctuations. No evidence is found for direct interaction or for doorway states. The mean level widths of the compound nucleus for decay to the ground and first excited states of 28Si have been found to be 47±7 keV and 42±5 keV, respectively. The statistical dependences of these values on the range of data n and on the experimental values of the auto-correlation are discussed and found to be important considerations.
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