Light clusters in warm stellar matter: Explicit mass shifts and universal cluster-meson couplings

Pais, Helena; Gulminelli, F.; Providência, Constança; Röpke, G.

doi:10.1103/physrevc.97.045805

Cited by 40 publications

(92 citation statements)

References 38 publications

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“…It is interesting to remark that a qualitatively similar density dependence for the binding energy shifts was obtained in Ref. [10]. However, a direct comparison of the ∆E corrections of Fig.…”

Section: Resultssupporting

confidence: 84%

“…3 with the effective masses of Ref. [10] is not possible because of the different mechanisms of cluster suppression in the two formalisms. The compatibility of the different approaches can only be established by comparing the cluster abundances, as we will do below.…”

Section: Resultsmentioning

confidence: 99%

“…Such in-medium effects have been computed from a quantum-statistical approach [6][7][8], but the calculations are limited to a relatively small domain of temperatures and densities. From a phenomenological point of view, a possible solution is the introduction of a density-dependent binding energy shift, which should be fixed with the help of experimental constraints [9,10] from heavy ion collisions, where such clusters are copiously produced, though in a transient configuration.…”

Section: Introductionmentioning

confidence: 99%

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Binding energy shifts from heavy-ion experiments in a nuclear statistical equilibrium model

Mallik¹,

Pais²,

Gulminelli³

2021

Preprint

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Chemical constants extracted from 124 Xe+ 124 Sn collisions at 32 AMeV are compared to the predictions of an extended Nuclear Statistical Equilibrium model including mean-field interactions and in-medium binding energy shifts for the light (Z ≤ 2) clusters. The ion species and density dependence of the in-medium modification is directly extracted from the experimental data. We show that the shift increases with the mass of the cluster and the density of the medium, and we provide a simple linear fit for future use in astrophysical simulations in the framework of the CompOSE data base. The resulting mass fractions are computed in representative thermodynamic conditions relevant for supernova and neutron star mergers. A comparison to the results of a similar analysis of the same data performed in the framework of a relativistic mean-field model shows a good agreement at low density, but significant discrepancies close to the Mott dissolution of clusters in the dense medium.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Binding energy shifts from heavy-ion experiments in a nuclear statistical equilibrium model

Mallik¹,

Pais²,

Gulminelli³

2021

Preprint

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“…Indeed, light clusters (A C ≤ 4) could greatly impact the EoS and constitutes an important topic of study nowadays [11,12]. The modification of the clusters characteristics such as its binding energy in the nuclear medium due to the surrounding nuclear environment must be taken into account and investigated in order to better constrain the theoretical models [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

In-medium effects in central heavy ion collisions at intermediate energies

Henri¹,

Lopez²,

Durand³

et al. 2020

Phys. Rev. C

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Energy dissipation and cluster production in central nuclear collisions in the Fermi energy range have been investigated using the large INDRA database. A study of the in-medium nucleon-nucleon cross section, σ * N N , has been performed by comparing the results of a model with the measured isotropy ratio of the kinetic energy distributions of the detected protons. This analysis has been done for a large variety of systems at various incident energies from 20 to 100 MeV/nucleon and confirms nicely previous results with enhanced statistics in a full Monte Carlo treatment. Most importantly, it is found that σ * N N is drastically reduced as compared to the vacuum values, due partly to Pauli blocking but also to in-medium effects for which mean values and uncertainties are given. Concerning the cluster production, a coalescence model has been developed to study the parallel and perpendicular velocity distributions of the light clusters (A ≤ 4). For the AC = 3 (3 H, 3 He), it is found that the mean internal kinetic energy of the nucleons in the cluster is reduced as compared to the vacuum value. These two results shows that any comparison between experimental and theoretical predictions in heavy-ions induced reactions around and above Fermi energy must take into account these in-medium effects.

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“…[14]) and the compressible liquid drop model (CLD) with clusters (see Ref. [32]), both calculations including light clusters. In the CP approach, the surface and Coulomb field contributions are added in a non-self-consistent calculation, and, therefore, the results should be interpreted with caution.…”

Section: No Clustersmentioning

confidence: 99%

Light clusters and pasta phases in warm and dense nuclear matter

et al. 2017

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The pasta phases are calculated for warm stellar matter in a framework of relativistic mean-field models, including the possibility of light cluster formation. Results from three different semiclassical approaches are compared with a quantum statistical calculation. Light clusters are considered as point-like particles, and their abundances are determined from the minimization of the free energy. The couplings of the light clusters to mesons are determined from experimental chemical equilibrium constants and many-body quantum statistical calculations. The effect of these light clusters on the chemical potentials is also discussed. It is shown that, by including heavy clusters, light clusters are present up to larger nucleonic densities, although with smaller mass fractions.

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Light clusters in warm stellar matter: Explicit mass shifts and universal cluster-meson couplings

Cited by 40 publications

References 38 publications

Binding energy shifts from heavy-ion experiments in a nuclear statistical equilibrium model

Binding energy shifts from heavy-ion experiments in a nuclear statistical equilibrium model

In-medium effects in central heavy ion collisions at intermediate energies

Light clusters and pasta phases in warm and dense nuclear matter

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