In-medium effects for nuclear matter in the Fermi-energy domain

Lopez, O.; Durand, Dominique; Lehaut, G.; Borderie, B.; Frankland, J.D.; Rivet, M. F.; Bougault, R.; Chbihi, A.; Galichet, E.; Guinet, D.; Commara, M. La; Neindre, N. Le; Lombardo, I.; Manduci, L.; Marini, P.; Napolitani, P.; Pârlog, M.; Rosato, E.; Spadaccini, G.; Vient, E.; Vigilante, M.

doi:10.1103/physrevc.90.064602

Cited by 68 publications

(53 citation statements)

References 44 publications

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“…In Ref. [13], similar characteristics of stopping are shown for the quantity R p E which is similar to R E but it is defined for the sum of the kinetic energy components of detected protons only. Another difference is that the sums in the numerator and the denominator are first taken for the protons from all the selected central events and then the ratio is calculated.…”

Section: Au+au Xe+csi Ni+nimentioning

confidence: 89%

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Dynamics of clusters and fragments in heavy-ion collisions

Ono

2019

Progress in Particle and Nuclear Physics

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A review is given on the studies of formation of light clusters and heavier fragments in heavy-ion collisions at incident energies from several tens of MeV/nucleon to several hundred MeV/nucleon, focusing on dynamical aspects and on microscopic theoretical descriptions. Existing experimental data already clarify basic characteristics of expanding and fragmenting systems typically in central collisions, where cluster correlations cannot be ignored. Cluster correlations appear almost everywhere in excited low-density nuclear many-body systems and nuclear matter in statistical equilibrium where the properties of a cluster may be influenced by the medium. On the other hand, transport models to solve the time evolution have been developed based on the single-nucleon distribution function. Different types of transport models are reviewed putting emphasis both on theoretical features and practical performances in the description of fragmentation. A key concept to distinguish different models is how to consistently handle single-nucleon motions in the mean field, fluctuation or branching induced by two-nucleon collisions, and localization of nucleons to form fragments and clusters. Some transport codes have been extended to treat light clusters explicitly. Results indicate that cluster correlations can have strong impacts on global collision dynamics and correlations between light clusters should also be taken into account.

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Section: Au+au Xe+csi Ni+nimentioning

confidence: 89%

“…For the INDRA data, analyses of stopping have been published in Refs. [10,13], where the stopping is characterized by the ratio of transverse and longitudinal kinetic energies…”

Section: Au+au Xe+csi Ni+nimentioning

confidence: 99%

Dynamics of clusters and fragments in heavy-ion collisions

Ono

2019

Progress in Particle and Nuclear Physics

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“…The metrics of the test particle agglomerates is defined in such a way that the packet width in coordinate space is the closest to (σ medium NN /π), where σ medium NN corresponds to the screened cross section prescription proposed by Danielewicz [65], which was found to describe recent experimental data [66]. In this way, the spatial extension of the packet decreases as the nucleon density increases.…”

Section: Boltzmann-langevin One Body Description Of a Spallationmentioning

confidence: 99%

Frustrated fragmentation and re-aggregation in nuclei: A non-equilibrium description in spallation

Napolitani

Colonna

2015

Phys. Rev. C

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Heavy nuclei bombarded with protons and deuterons in the 1 GeV range have a large probability of undergoing a process of evaporation and fission; less frequently, the prompt emission of few intermediate-mass fragments can also be observed.We employ a recently developed microscopic approach, based on the Boltzmann-Langevin transport equation, to investigate the role of mean-field dynamics and phase-space fluctuations in these reactions.We find that the formation of few IMF's can be confused with asymmetric fission when relying on yield observables, but it can not be assimilated to the statistical decay of a compound nucleus when analysing the dynamics and kinematic observables: it can be described as a fragmentation process initiated by phase-space fluctuations, and successively frustrated by the mean-field resilience. As an extreme situation, which corresponds to non-negligible probability, the number of fragments in the exit channel reduces to two, so that fission-like events are obtained by re-aggregation processes.This interpretation, inspired by nuclear-spallation experiments, can be generalised to heavy-ion collisions from Fermi to relativistic energies, for situations when the system is closely approaching the fragmentation threshold. I. CONTEXTSeveral decades passed from Serber's early description [1] of nuclear reactions induced by nucleons and light nuclei at few hundred MeV per nucleon. In their standard outline, such reactions, generally called spallation, could be described as a fast excitation of an atomic nucleus, followed by a slower decay process [2,3]: depending on the phase space available [4,5], the system undergoes a sequence of more or less asymmetric splits [6, 7] ranging from particle evaporation to fission. It was found already in pioneering studies [8][9][10][11][12][13][14][15][16][17], that the most excited systems can also produce intermediate-mass fragments (IMF), and lead to a richer phenomenology comparable with nucleus-nucleus collisions and nuclear fragmentation [18][19][20][21]. Further research focused on the study of thermodynamic observables from spallation reactions in the relativistic domain [22][23][24][25], in connection with the liquid-gas phase transition in nuclear matter [26,27], and in parallel with the research on the multifragmentation process observed in ion-ion collisions in the Fermi-energy domain [28][29][30][31][32].Several fields of application, from energy and environment to neutron sources and exotic beams, stimulated intense research on protons and deuterons in the 1 GeV range impinging on heavy nuclei. The production of some specific light nuclides with large kinetic energy resulted of great relevance in several technical issues (radiation damages, fragilisation of structural materials in acceleratordriven systems, side effects in medical hadron-therapies). This despite the minor contribution of the whole IMF production to the total reaction cross section, which was found to amount to few millibarn. In more recent experiments, the possibility of correlati...

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“…The nucleon mean free path in the nucleus has been found (see, e.g. Figure 7 of [5]) to be larger than the nuclear radius, that is,…”

Section: Introductionmentioning

confidence: 99%

“…There is consensus that, qualitatively, one should move to bound nuclei surrounded by free neutrons (in the so-called inner crust) and then to various forms of clusterised neutron matter, before reaching the uniform neutron matter phase around ρ 0 in the outer core. In the so-called inner core, namely for densities larger than ρ 0 , the formation of new particles, like hyperons, 5 can be considered natural in keeping with the fact that the energy density allows such creation. Nobody knows, at present, how large the density can be at the centre of the star, and if a gas of deconfined quarks can be formed or not.…”

Section: Introductionmentioning

confidence: 99%

Nuclear density functional theory

Colò

2020

Advances in Physics: X

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The goal of nuclear structure physics is to provide a complete understanding of the static properties of atomic nuclei, their excitation spectra, their response to external fields and their decays. While it is hard to achieve these goals within a single framework, so that there is no nuclear 'standard model', it is clear that nuclear Density Functional Theory (DFT) has probably the widest range of applicability so far. In this paper, we try to put DFT in a broader context, with frequent comparisons to electronic DFT. We also include a discussion of the relationships with ab initio methods and Effective Field Theories (EFTs) in general, as well as a short survey of the quite large number of applications. Although written with a personal and possibly biased perspective, the paper aims at fostering cross-fertilizations with other domains of science.

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In-medium effects for nuclear matter in the Fermi-energy domain

Cited by 68 publications

References 44 publications

Dynamics of clusters and fragments in heavy-ion collisions

Dynamics of clusters and fragments in heavy-ion collisions

Frustrated fragmentation and re-aggregation in nuclei: A non-equilibrium description in spallation

Nuclear density functional theory

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