Properties of the fast fission and the coincident emissions of light charged particles in $^{40}$Ar + $^{197}$Au reactions at 30 MeV/u

TL;DR

This study investigates the properties and angular distributions of light charged particles emitted in $^{40}$Ar + $^{197}$Au reactions at 30 MeV/u, revealing how emission patterns depend on reaction dynamics and angular variables.

Contribution

It provides detailed measurements of light charged particles and fission fragment correlations, offering new insights into emission mechanisms in heavy-ion reactions at intermediate energies.

Findings

Tritons are more abundant at small angles.

Protons are more abundant at large angles.

Neutron richness of light particles is consistent with previous experiments.

Abstract

The experiment of Ar+Au reactions at 30 MeV/u have been performed using the Compact Spectrometer for Heavy IoN Experiments (CSHINE) in phase I. The light-charged particles are measured by the silicon stripe telescopes in coincidence with the fission fragments recorded by the parallel plate avalanche counters. The distribution properties of the azimuth difference $\Delta \phi$ and the time-of-flight difference $\Delta TOF$ of the fission fragments are presented varying the folding angles which represents the linear momentum transfer from the projectile to the reaction system. The relative abundance of the light charged particles in the fission events to the inclusive events is compared as a function of the laboratory angle $\theta_{\rm lab}$ ranging from $18^\circ$ to $60^\circ$ in various folding angle windows. The angular evolution of the yield ratios of p/d and t/d in coincidence with fission fragments is investigated. In a relative comparison, tritons are more abundantly emitted at small angles, while protons are more abundant at large angles. The angular evolution of the neutron richness of the light-charged particles is consistent with the results obtained in previous inclusive experiments.