Constraining the symmetry energy with heavy-ion collisions and Bayesian analyses

Morfouace, P.; Tsang, C. Y.; Zhang, Y.; Lynch, W. G.; Tsang, M.B.; Coupland, D.; Youngs, M.; Chajęcki, Z.; Famiano, M.; Ghosh, T. K.; Jhang, G.; Lee, Jenny; Liu, H.; Sanetullaev, A.; Showalter, R. H.; Winkelbauer, J.

doi:10.1016/j.physletb.2019.135045

Cited by 64 publications

(51 citation statements)

References 51 publications

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“…We note that the values chosen for these parameters explore a wide range of asy-stiffness values concerning the symmetry energy. The more softones are consistent with the ones suggested from different sources of experimental evidences [14,[19][20][21]. The case γ ef f =1.58 has been included for completeness, and it is not too far from the upper limits suggested from the analysis of the iso-spin analog states [22].…”

Section: A Simple Finite Range Interacion In the Mf Limitsupporting

confidence: 85%

“…5 the average R ex = i =j R i,j,ex A and R dr = i =j R i,j,dr A evaluated at ρ 0 and t s = 0 (see also eqs. (20,23)) as a function of the range µ. The full symbols represent the CoMD calculations.…”

Section: Discussion Of the Obtained Resultsmentioning

confidence: 99%

“…The expressions Eqs (15)(16)(17)(18)(19)(20)(21)(22). which are functions of the wave-packed centroids have been evaluated in box calculations with periodic boundary conditions to simulate the ground state NM.…”

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confidence: 99%

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Finite Range Interactions in Constrained Molecular Dynamics

Papa¹

2021

Preprint

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Many-body correlations developed in the constrained molecular dynamics approach in the framework of the CoMD model are analyzed in the case of a finite range effective interaction. The study is performed in the case of infinite nuclear matter at zero temperature. A comparison with the predictions in the mean-field limit, which is taken as a reference case, highlights non negligible differences concerning the produced Equation of State (EoS)for symmetric and asymmetric NM.A procedure is illustrated able to determine the necessary corrections of the effective interaction parameters in CoMD model in such a way to reproduce the chosen reference EoS saturation properties. Even if the obtained numerical results are strictly valid for the CoMD model, the rather general feature of the discussed correlations gives a wider meaning to the obtained differences which are strongly related to the nucleon wave function space localization characterizing every semi-classical quantum molecular dynamics approach. Finally the relevance of the constraint on the primary light cluster production is shortly illustrated in an appendix section.

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Section: A Simple Finite Range Interacion In the Mf Limitsupporting

confidence: 85%

Section: Discussion Of the Obtained Resultsmentioning

confidence: 99%

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Finite Range Interactions in Constrained Molecular Dynamics

Papa¹

2021

Preprint

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“…More generally, it would be very interesting to explore a consistent map of many observables in a multiparameter physics input space, see for instance the recent Bayesian analysis of Ref. [187].…”

Section: Discussionmentioning

confidence: 99%

Collision dynamics at medium and relativistic energies

Colonna

2020

Progress in Particle and Nuclear Physics

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Recent results connected to nuclear collision dynamics, from low up to relativistic energies, are reviewed. Heavy ion reactions offer the unique opportunity to probe the complex nuclear manybody dynamics and to explore, in laboratory experiments, transient states of nuclear matter under several conditions of density, temperature and charge asymmetry. From the theoretical point of view, transport models are an essential tool to undertake these investigations and make a connection betwen the nuclear effective interaction and sensitive observables of experimental interest. In this article, we mainly focus on the description of results of transport models for a selection of reaction mechanisms, also considering comparisons of predictions of different approaches. This analysis can help understanding the impact of the interplay between mean-field and correlation effects, as well as of in-medium effects, on reaction observables, which is an essential point also for extracting information on the nuclear Equation of State. A special emphasis will be given to the review of recent studies aimed at constraining the density behavior of the nuclear symmetry energy. For reactions at medium (Fermi) energies, we will describe light particle and fragment emission mechanisms, together with isospin transport effects. Collective effects characterizing nuclear collision dynamics, such as transverse and elliptic flows, will be discussed for relativistic heavy ion reactions, together with meson production and isotopic ratios.

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“…They give qualitatively consistent but quantitatively appreciably different m * n−p (ρ 0 , δ) values. One interesting exception is the result of m * n−p (ρ 0 , δ) = (−0.05 ± 0.09)δ from a Bayesian analysis of the neutron/proton spectrum ratios in several Sn+Sn reactions at 120 MeV/nucleon at NSCL/MSU using an ImQMD transport model for nuclear reactions with Skyrme forces [22]. A negative m * n−p (ρ 0 , δ) implies a characteristically different momentum dependence of the nucleon isovector potential inconsistent with the findings from optical model analyses of existing nucleon-nucleus scattering data [7].…”

Section: A L L S Q U a R E S U S I N N G G I A N T R E S O N A N C E ...mentioning

confidence: 99%

A theoretical overview of isospin and EOS effects in heavy-ion reactions at intermediate energies

Li,

Cai,

Chen

et al. 2022

Preprint

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The isospin dependence of in-medium nuclear effective interactions is a fundamental issue in nuclear physics and has broad ramifications in astrophysics. Its uncertainties, especially the difference of neutron-proton interactions in the isosinglet and isotriplet channels, affect significantly the density and momentum dependence of the isovector single-nucleon potential and nucleon-nucleon short-range correlation in neutron-rich matter. Consequently, the neutron-proton effective mass splitting and the density dependence of nuclear symmetry energy are still rather uncertain. Heavy-ion reactions especially those involving rare isotopes is a useful tool for probing the isospin dependence of nuclear effective interactions through (1) the neutron-skin in coordinate and proton-skin in momentum of the initial state of colliding nuclei, (2) the density and momentum dependence of especially the isovector nuclear mean-field as well as (3) the isospin dependence of in-medium nucleonnucleon cross sections. Observations of neutron stars especially since GW1710817 have also helped us significantly in understanding the isospin dependence of nuclear effective interactions. We summarize here a review talk on these issues given at the 2021 International Workshop on multi-facets of EOS and Clustering. For details we refer the readers to the original publications and references therein.

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Constraining the symmetry energy with heavy-ion collisions and Bayesian analyses

Cited by 64 publications

References 51 publications

Finite Range Interactions in Constrained Molecular Dynamics

Finite Range Interactions in Constrained Molecular Dynamics

Collision dynamics at medium and relativistic energies

A theoretical overview of isospin and EOS effects in heavy-ion reactions at intermediate energies

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