A comprehensive model for ~ particle induced reactions, recently proposed by two of the authors, has been improved and utilised in the analysis of proton and ~ particle spectra, angular distributions, excitation functions, spectra of neutrons emitted in the decay of continuum states on nuclei with 50 < A < 230 at ~ energies varying from 50 to 160 MeV. A unique set of average parameters has been used in all the calculations. Most of them were the same utilised in previous analyses of nucleon and ~ induced reactions. The energy and mass dependence (which turns out to be quite weak) of the additional parameters which are needed to describe the ~ particle induced reactions has been determined. The comparison with experimental data shows that the model discussed allows one to reproduce successfully the cross sections of ~ particle induced reactions with an accuracy comparable to the one already gained in the analysis of nucleon and ~-reactions with the Exciton Model.
Experimental evidence is presented that the 144Nd(p,e)14~pr reaction excites residual nucleus levels with a dominant single proton configuration, suggesting a contribution from knock-on mechanism.The angular distributions of the a-particles populating these levels have been analysed by means of one step pick-up (both in finite and zero range approximation) and knock-on theories, assuming that the spectroscopic amplitudes for the two processes are proportional to the spectroscopic amplitudes for proton transfer in pick-up and stripping reactions, respectively. The results obtained suggest the importance of knock-on contributions to some of the transitions.Nuclear Reaction: 144Nd(p, e) 141Pr, Ep = 25 MeV; measured and analysed a(O) for transitions to low lying states.
A high resolution experiment, using the BIG KARL spectrometer has been made to identify the levels of 141pr excited in the 144Nd(p,~) reaction at 25 MeV. It has been found that only levels with a dominant single proton component are populated with appreciable intensity.
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