Statistical multifragmentation features of midvelocity source in semiperipheral heavy-ion collisions

TL;DR

This paper investigates midvelocity emissions in semiperipheral heavy-ion collisions, proposing that these emissions originate from a hot, dilute, possibly neutron-rich source formed in the overlap region, and compares experimental data with a multifragmentation model.

Contribution

It introduces a multifragmentation scenario to explain midvelocity emissions in heavy-ion collisions, emphasizing the source's properties and insensitivity to its size.

Findings

Emissions are consistent with multifragmentation of a hot, dilute source.

The source may be more neutron-rich than the initial nuclei.

Results are insensitive to the source size.

Abstract

Some characteristics of midvelocity emissions in semiperipheral heavy-ion collisions at Fermi energies are discussed in the framework of a multifragmenting scenario. We report on binary dissipative collisions of 93Nb + 93Nb at 38AMeV in which we measured an abundant emission of particles and fragments not originated from the usual evaporative decay of hot primary fragments. We checked the compatibility of these emissions with the multifragmentation of a source which forms in the overlap region. One can fairly well reproduce the data assuming a hot and dilute source, possibly more n-rich than the initial nuclei; the results appear to be insensitive to the source size.