Multifragmentation threshold in ^{93}Nb+{nat}Mg collisions at 30 MeV/nucleon

TL;DR

This study investigates the transition from binary decay to multifragmentation in Nb+Mg collisions at 30 MeV/nucleon, demonstrating that multifragmentation dominates near the energy threshold through model-data comparison.

Contribution

The paper applies backtracing techniques to statistical models to distinguish between decay mechanisms, confirming multifragmentation as the primary process at specific excitation energies.

Findings

Data favor SMM over GEMINI for describing fragmentation.

Multifragmentation is the dominant decay mode near 3 MeV/nucleon.

Model comparisons align with experimental charge and mass distributions.

Abstract

We analyzed the $^{93}Nb$ on $^{nat}Mg$ reaction at 30 MeV/nucleon in the aim of disentangling binary sequential decay and multifragmentation decay close to the energy threshold, i.e. $\simeq 3$ MeV/nucleon. Using the backtracing technique applied to the statistical models GEMINI and SMM we reconstruct simulated charge, mass and excitation energy distributions and compare them to the experimental ones. We show that data are better described by SMM than by GEMINI in agreement with the fact that multifragmentation is responsible for fragment production at excitation energies around 3 MeV/nucleon.