Depletion of light cluster production in 1 GeV proton-nucleus collisions

Roepke, G.; Schulz, H.; Andronenko, L.N.; Котов, А. Б.; Neubert, W.; Vol'Nin, E. N.

doi:10.1103/physrevc.31.1556

Cited by 7 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because they are mostly weakly bound and show cluster structures (e.g. 8 Be), it is assumed that they are strongly influenced (and suppressed) by the medium, for a discussion see [32,33]. Nevertheless, they have to be discussed and this is the aim of this work.…”

Section: Introductionmentioning

confidence: 99%

Full distribution of clusters with universal couplings and in-medium effects

et al. 2019

View full text Add to dashboard Cite

Light and heavy clusters are calculated for asymmetric warm nuclear matter in a relativistic mean-field approach. In-medium effects, introduced via a universal cluster-meson coupling, and a binding energy shift contribution, calculated in a Thomas-Fermi approximation, were taken into account. This work considers, besides the standard lightest bound clusters 4 He, 3 He, 3 H, and 2 H, also stable and unstable clusters with higher number of nucleons, in the range 5 ≤ A ≤ 12, as it is natural that heavier clusters also form in core-collapse supernova matter, before the pasta phases set in. We show that these extra degrees of freedom contribute with non-negligible mass fractions to the composition of nuclear matter, and may prevail over deuterons and α particles at high density in strongly asymmetric matter, and not too high temperatures. The presence of the light clusters reduces the contribution of heavy clusters to a much smaller density range, and to a smaller mass fraction.

show abstract

Section: Introductionmentioning

confidence: 99%

Full distribution of clusters with universal couplings and in-medium effects

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Such a process is closely linked to the multifragmentation mechanism experimentally observed in nuclear reactions [8] and to the occurrence of clustering phenomena in the inner crust of neutron stars [9,10]. Owing to the two-component structure of nuclear matter, a central role in this mechanism pertains to the density behavior of the isovector part of the ef-fective interaction and the corresponding term in the nuclear Equation of State, the symmetry energy [11,12], on which many investigations are concentrated [13][14][15][16][17]. Indeed, as also pointed out for the pairing interaction, this information is essential for the understanding of nuclear structure [18,19] and of the properties of neutron stars [9,20].…”

mentioning

confidence: 99%

Pairing effects on spinodal decomposition of asymmetric nuclear matter

2014

View full text Add to dashboard Cite

We investigate the impact of pairing correlations on the behavior of unstable asymmetric nuclear matter at low temperature. We focus on the relative role of the pairing interaction, coupling nucleons of the same type (neutrons or protons), with respect to the symmetry potential, which enhances the neutron-proton attraction, along the clusterization process driven by spinodal instabilities. It is found that, especially at the transition temperature from the normal to the superfluid phase, pairing effects may induce significant variations in the isotopic content of the clusterized matter. This analysis is potentially useful to gather information on the temperature dependence of nuclear pairing and, in general, on the properties of clusterised low-density matter, of interest also in the astrophysical context. Investigations of many-body interacting systems have always been an exciting and attractive field in different domains of physics. Indeed understanding the properties of complex systems in terms of their constituent particles and the interaction among them is a true challenge. The original (and unsolvable) quantal many-body problem, is often approached adopting the mean-field approximation, yielding a so-called effective interaction [1,2]. However, suitable extensions of mean-field models have been introduced to take explicitly into account the effects of relevant interparticle correlations. This is the case, for instance, of pairing correlations which occur, under suitable conditions, in fermionic systems [3].Many efforts are currently focused on the study of the properties of complex nuclei and infinite nuclear matter. It is well known that nucleons can form paired states, analogous to the way electrons pair in metals, yielding a superconducting phase [3]. Pairing effects on nuclear masses are widely investigated nowadays, also in connection with astrophysical applications requiring the knowledge of the mass of very neutron-rich nuclei, which play a crucial role in the r process of nucleosynthesis [4]. Moreover, the presence of neutron superfluidity in the crust and the inner part of neutron stars is considered well established in the physics of these compact stellar objects, and has a significant effect on cooling processes [5] and glitch phenomena [6,7].Complex many-body systems are also characterized by the possible occurence of different kinds of phase transitions. For nuclear matter at sub-saturation density and relatively low temperature (T 15M eV ) liquidgas phase transitions are expected to appear, driven by the unstable mean-field. Such a process is closely linked to the multifragmentation mechanism experimentally observed in nuclear reactions [8] and to the occurrence of clustering phenomena in the inner crust of neutron stars [9,10]. Owing to the two-component structure of nuclear matter, a central role in this mechanism pertains to the density behavior of the isovector part of the effective interaction and the corresponding term in the nuclear Equation of State, the symmetry energy [11,12], on wh...

show abstract

“…Are signatures of the Mott points seen from the experiments? -Consequences of in-medium effects for the energy spectra of the light elements are seen in a suppression at low momenta [39]. Therefore, detectors should be designed to work in this region in order to investigate the effects of medium modifications on the energy spectra of light elements.…”

Section: Resultsmentioning

confidence: 99%

Light Cluster Production at NICA

Bastian¹,

Blaschke²,

Röpke³

2017

Acta Phys. Pol. B Proc. Suppl.

View full text Add to dashboard Cite

Abstract. Light cluster production at the NICA accelerator complex offers unique possibilities to use these states as "rare probes" of in-medium characteristics such as phase space occupation and early flow. In order to explain this statement, in this contribution theoretical considerations from the nuclear statistical equilibrium model and from a quantum statistical model of cluster production are supplemented with a discussion of a transport model for light cluster formation and with results from hydrodynamic simulations combined with the coalescence model. PACS

show abstract

Depletion of light cluster production in 1 GeV proton-nucleus collisions

Cited by 7 publications

References 23 publications

Full distribution of clusters with universal couplings and in-medium effects

Full distribution of clusters with universal couplings and in-medium effects

Pairing effects on spinodal decomposition of asymmetric nuclear matter

Light Cluster Production at NICA

Contact Info

Product

Resources

About