Elsevier

Nuclear Physics

Volume 14, Issue 3, 1 January 1960, Pages 472-497
Nuclear Physics

Properties of levels excited in (p, α) reactions on O18, P31, Cl35, Cl37, K39 and K41

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Abstract

Excitation functions and differential cross sections at 90° to the beam have been measured for the (p, α) ground state reactions in O18, P31, Cl35, Cl37, K39 and K41 from 1 to 3 MeV proton energy using a magnetic spectrometer to detect the alpha particles. Reduced widths and strength functions for protons and alpha particles are derived; the alpha-particle strength functions are a factor of five smaller than the proton values which agree with published results of (p, n) studies in the mass 40 region. The reduced widths of protons and alpha particles in units of h̵2/μR2 are both 3×10−2 for P31 and decrease to 0.4×10−2 near mass 40. The equality of the proton and alpha-particle reduced widths suggests that these particles appear on the nuclear surface with equal probability. The measured mean level spacing runs from 78 keV for P31 to < 15 keV in the mass 40 region. These are larger than is predicted by the semi-empirical level spacing equations of Cameron. The measured Q-values of the (p, α) reaction on the isotopes shown are Cl35 = 1.865±0.015 MeV, Cl37 = 3.015±0.015 MeV, K39 = 1.267±0.020 MeV, K41 = 4.002±0.020 MeV.

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