Abstract
Argon was bombarded with α-particles of energy 20 MeV and less. Protons and α-particles emitted in various directions in small solid angles were recorded by means of a gridded ionization chamber. The upper end of the proton energy spectrum showed groups corresponding to transitions to individual low-lying levels in K 43. Angular distributions for some of the groups were obtained. The main proton spectrum is an evaporation spectrum, and values for the nuclear temperature were obtained. It was found that the group of secondary emitted protons, in (α, xp) reactions, were quite small, in contrast to the case when Ca, Cu or other targets were used, but in agreement with the expected behaviour. Cross sections for A 40(α, p)K 43 and A 40(α, pn)K 42 were measured. Spectra of scattered α-particles show strongly populated collective levels in A 40 corresponding to the known 3 − and 5 − levels in Ca 40.
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