Evaporation Residue Production in Complete and Incomplete Fusion Reactions of Ne-20 with Au-197 and Ho-165 at E = 14.9 x AMeV

TL;DR

This study measures velocity distributions of heavy residues from Ne-20 induced reactions on Au-197 and Ho-165, revealing the significant role of pre-equilibrium emissions in residue formation at 14.9 MeV per nucleon.

Contribution

It provides quantitative estimates of pre-equilibrium contributions to heavy residue production in fusion reactions at intermediate energies.

Findings

Velocity distributions show a linear increase with decreasing residue mass.

Pre-equilibrium processes contribute up to 90% for astatine isotopes.

Pre-equilibrium processes contribute about 50% for polonium isotopes.

Abstract

Velocity distributions of heavy residues (A_Res > A_Tar), produced in irradiations of Au-197 and Ho-165 with Ne-20 at bombarding energies of E = 208 MeV, have been measured at the velocity filter SHIP. While for the products from Ne-20 + Ho-165 just a mean value of v/v_CN = 0.91+-0.01 was obtained, individual residues, attributed to isotopes of astatine and polonium with mass numbers ranging from A=195 to A=203 could be identified by means of alpha - spectroscopy in the bombardments Au-197. A linear increase of the mean velocity from v/v_CN = 0.85 to v/v_CN = 0.93 with decreasing residue mass was observed. This effect was attributed to an increasing contribution of pre-equilibrium particle emission to the production of heavy residues. A quantititative estimation resulted in a 90 % contribution of pre-equilibrium processes to the production of astatine isotopes, and a 50 % contribution to the polonium isotopes.