Correlation between time and angular alignment in molecular dynamics simulations of heavy ion collisions

Le résumé fourni par la source

Neutron-proton equilibration is a process which has been used to study the density dependence of the symmetry energy term in the nuclear equation-of-state. This study utilizes constrained molecular dynamics (CoMD) simulations of $^{70}\mathrm{Zn}\phantom{\rule{4pt}{0ex}}+\phantom{\rule{4pt}{0ex}}^{70}\mathrm{Zn}$ with collision energies of 35 and 45 MeV/nucleon. An algorithm is used which searches through CoMD events and identifies the PLF* after it separates from the target and determines its lifetime, $\mathrm{\ensuremath{\Delta}}t$. It also determines the fragments that the PLF* breaks apart into and determines their angular alignment. This technique gives an opportunity to explore how the average alignment of dynamically produced fragments, ${\ensuremath{\langle}\ensuremath{\alpha}\ensuremath{\rangle}}_{\mathrm{dyn}}$, evolves with PLF* lifetime. An approximately linear relationship was determined with $d{\ensuremath{\langle}\ensuremath{\alpha}\ensuremath{\rangle}}_{\mathrm{dyn}}/d\mathrm{\ensuremath{\Delta}}t=0.98\ifmmode\pm\else\textpm\fi{}0.08\phantom{\rule{0.16em}{0ex}}\mathrm{rad}/\mathrm{zs}$ and $1.06\ifmmode\pm\else\textpm\fi{}0.09\phantom{\rule{0.16em}{0ex}}\mathrm{rad}/\mathrm{zs}$ for the 35 and $45\phantom{\rule{0.16em}{0ex}}\mathrm{MeV}/\mathrm{nucleon}$, respectively, indicating a correlation with magnitude consistent with classically determined values which were used for prior experimental studies.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.