Isoscaling and the nuclear EoS

Abstract

Experiments with rare isotopes are shedding light on the role isospin plays in the equation of state (EoS) of nuclear matter, and isoscaling -an straight-forward comparison of reactions with different isospin-could deliver valuable information about it. In this work we test this assertion pragmatically by comparing molecular dynamics simulations of isoscaling reactions using different equations of state and looking for changes in the isoscaling parameters; to explore the possibility of isoscaling carrying information from the hot-and-dense stage of the reaction, we perform our study in confined and expanding systems. Our results indicate that indeed isoscaling can help us learn about the nuclear EoS, but only in some range of excitation energies.

Symmetry energy in the liquid–gas mixture

“…For the sake of brevity, readers interested in learning about the virtues of CMD and its comparison to other methods are directed to a previous study [8]. Here we simply reiterate that CMD has been used since 2001 [9][10][11][12][13][14][15][16] to study reactions, critical phenomena, neutron-rich nuclei (isoscaling and neutron star crusts) and, of course, phase changes and clusterization, all without any adjustable parameters. Although lacking Pauli blocking and wave dynamics, Ref.…”

Experimental effects of dynamics and thermodynamics in nuclear reactions on the symmetry energy as seen by the CHIMERA 4 $ \pi$ detector

“…5 and T is the effective temperature, supposed to be the same for the two systems. In fact, isoscaling behavior does not imply that a full thermodynamical equilibrium is reached before fragment emission [99,104,105]. A decrease of the symmetry energy with the increasing of the excitation energy and centrality of the reaction has been observed in the framework of statistical models (see [106] and references therein).…”

Isospin-asymmetric nuclear matter

“…This parameter-free model has been successfully used to study nuclear reactions obtaining mass multiplicities, momenta, excitation energies, secondary decay yields, critical phenomena and isoscaling behavior that have been compared to experimental data [48][49][50][51][52][53][54][55][56][57]. More recently, and of interest to the present work, the model was used to study infinite nuclear systems at low temperatures [58] and in neutron star crust environments [45][46][47].…”