Proton-induced α- and Τ-emission at 72 MeV

Clustering Pre-equilibrium Model Analysis for Nucleon-induced Alpha-particle Spectra up to 200 MeV

“…For Fe, also it is true for other nuclei in this mass region, the statistical decay process gives major contributions to the total alpha-particle production cross section, and the cross section becomes much larger than that from pre-equilibrium process. Nevertheless, the pre-equilibrium process is still important above 10 09003-p.4 [15] MeV to give the total alpha-particle production cross sections that are consistent with the experimental data.…”

“…In Fig. 4, the calculated (p, xα) spectra are compared with the experimental data of Lewandwski et al [15] for 59 Co at 72.3 MeV and 208 Pb at 70.7 MeV, respectively. The present calculations reproduce the measured 59 Co(n, xα) very well.…”

Emission of alpha particles in the interaction of 10?85 MeV protons with48,50Ti

“…It has been shown [1] that it is this region which tests the pre-equilibrium emission of alpha clusters. The agreement achieved is indicative of the ability of the model to predict accurately both the extent of the presence of these clusters [4][5][6]18] and their probability of emission.…”

“…In all cases it was shown that the main contribution to the emitted ~ yield, at energies of the incident nucleon <70MeV, arises from the highest energy preformed c~ particles being knocked out by the incident nucleon. R was found to be independent both of the incident nucleon energy and of the target mass, though, in the latter case, local variations, mainly attributed to G, may be observed [6]. The present calculation has been performed by utilising a momentum distribution for the e particles of the type dn(P)+p6dp with a value for R of (0.62/A) and for the alpha Fermi Energy of 80MeV.…”

“…The e energy distributions have been evaluated on the basis of nucleon-c~ scattering dynamics. This approach allowed us to reproduce quite successfully both the energy spectra and the angular distributions of As in (N, c~) reactions [4][5][6]. Reactions ranging in complexity from 48Ti(p,n)48V…”