Charged particle decay of hot and rotating $^{88}$Mo nuclei in fusion-evaporation reactions

TL;DR

This paper investigates the decay mechanisms of hot, rotating $^{88}$Mo nuclei formed in fusion-evaporation reactions, comparing experimental data with statistical model predictions to understand particle emissions and reaction channels.

Contribution

It provides new experimental data on $^{88}$Mo decay channels and refines statistical model parameters for high-spin, medium-mass nuclei.

Findings

Discrepancies in forward $ extalpha$-particle emissions suggest pre-equilibrium processes.

Fusion-evaporation and fusion-fission cross sections align with existing systematics.

Light charged particle multiplicities offer insights into decay dynamics.

Abstract

A study of fusion-evaporation and (partly) fusion-fission channels for the $^{88}$Mo compound nucleus, produced at different excitation energies in the reaction $^{48}$Ti + $^{40}$Ca at 300, 450 and 600 MeV beam energies, is presented. Fusion-evaporation and fusion-fission cross sections have been extracted and compared with the existing systematics. Experimental data concerning light charged particles have been compared with the prediction of the statistical model in its implementation in the Gemini++ code, well suited even for high spin systems, in order to tune the main model parameters in a mass region not abundantly covered by exclusive experimental data. Multiplicities for light charged particles emitted in fusion evaporation events are also presented. Some discrepancies with respect to the prediction of the statistical model have been found for forward emitted $\alpha$-particles; they may be due both to pre-equilibrium emission and to reaction channels (such as Deep Inelastic Collisions, QuasiFission/QuasiFusion) different from the compound nucleus formation.