Dynamical and many-body correlation effects in the kinetic energy spectra of isotopes produced in nuclear multifragmentation

TL;DR

This paper models the kinetic energy spectra of isotopes from nuclear multifragmentation using statistical and evaporation models, comparing results with experimental data to understand the physics of the process.

Contribution

It combines the Statistical Multifragmentation Model and Weisskopf-Ewing evaporation to analyze isotope energy spectra in nuclear breakup, highlighting the effects of Coulomb repulsion and evaporation cross-sections.

Findings

Model reproduces qualitative features of energy spectra.

Fusion cross-section has minimal impact on spectra.

Quantitative discrepancies suggest further physics understanding is needed.

Abstract

The properties of the kinetic energy spectra of light isotopes produced in the breakup of a nuclear source and during the deexcitation of its products are examined. The initial stage, at which the hot fragments are created, is modeled by the Statistical Multifragmentation Model, whereas the Weisskopf-Ewing evaporation treatment is adopted to describe the subsequent fragment deexcita- tion, as they follow their classical trajectories dictated by the Coulomb repulsion among them. The energy spectra obtained are compared to available experimental data. The influence of the fusion cross-section entering into the evaporation treatment is investigated and its influence on the qual- itative aspects of the energy spectra turns out to be small. Although these aspects can be fairly well described by the model, the underlying physics associated with the quantitative discrepancies remains to be understood.