On separate chemical freeze-outs of hadrons and light (anti)nuclei in high energy nuclear collisions

Bugaev, K. A.; Grinyuk, B. E.; Ivanytskyi, O.; Sagun, V. V.; Savchenko, Denys; Zinovjev, G.; Nikonov, E. G.; Bravina, L.; Zabrodin, E. E.; Blaschke, D.; Kabana, S.; Taranenko, A.

doi:10.1088/1742-6596/1390/1/012038

Cited by 11 publications

(25 citation statements)

References 31 publications

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“…There are many important aspects of the CFO puzzle of light (anti)nuclei yields [37,38,39,40,41,42] measured in A+A collisions, but the central one is the value of their CFO temperature T A . This is so, since without the reliable knowledge of their CFO temperature T A one cannot formulate a physically adequate model for the production of deuterons (d), helium-3 ( 3 He), helium-4 ( 4 He) and hypertriton ( 3Λ H) and their antiparticles in A+A collisions and a model of their thermalization as well.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work [40] a more elaborate HRGM has been presented that is based on the concept of induced surface tension [25,26,27]. It uses an approximate expression for the hard-core radius of light (anti)nuclei denoted as bag model approximation (see below).…”

Section: Introductionmentioning

confidence: 99%

“…This restriction was overcome recently in [42], where it was shown that the bag model approximation can safely be used for piondominated matter. However, the derivation of the equa-tion of state (EoS) which extends the induced surface tension concept to the classical second virial coefficients of light (anti)nuclei as suggested in [40] is a heuristic one.…”

Section: Introductionmentioning

confidence: 99%

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Second virial coefficients of light nuclear clusters and their chemical freeze-out in nuclear collisions

Bugaev,

Vitiuk,

Grinyuk

et al. 2020

Preprint

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Here we develop a new strategy to analyze the chemical freeze-out of light (anti)nuclei produced in high energy collisions of heavy atomic nuclei within an advanced version of the hadron resonance gas model. It is based on two different, but complementary approaches to model the hard-core repulsion between the light nuclei and hadrons. The first approach is based on an approximate treatment of the equivalent hard-core radius of a roomy nuclear cluster and pions, while the second approach is rigorously derived here using a self-consistent treatment of classical excluded volumes of light (anti)nuclei and hadrons. By construction, in a hadronic medium dominated by pions, both approaches should give the same results. Employing this strategy to the analysis of hadronic and light (anti)nuclei multiplicities measured by ALICE at √ sNN = 2.76 TeV and by STAR at √ sNN = 200 GeV, we got rid of the existing ambiguity in the description of light (anti)nuclei data and determined the chemical freeze-out parameters of nuclei with high accuracy and confidence. At ALICE energy the nuclei are frozen prior to the hadrons at the temperature T = 175.1 +2.3 −3.9 , while at STAR energy there is a single freeze-out of hadrons and nuclei at the temperature T = 167.2 ± 3.9 MeV. We argue that the found chemical freeze-out volumes of nuclei can be considered as the volumes of quark-gluon bags that produce the nuclei at the moment of hadronization.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Second virial coefficients of light nuclear clusters and their chemical freeze-out in nuclear collisions

Bugaev,

Vitiuk,

Grinyuk

et al. 2020

Preprint

Self Cite

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“…The success of one-component IST EoS for symmetric nuclear matter [14] initiated a direction of the successful applications of such EoS to model the neutron stars properties [15,16]. Very recently the IST EoS was successfully extended to reproduce the classical second virial coefficients of light nuclei [17,18,19,20] and such an approach allowed us for the first time to simultaneously describe the hadron and light (anti-, hyper-) nuclei multiplicities measured in heavy ion collisions by the STAR BNL Collaboration at √ s N N = 200 GeV and by the ALICE CERN Collaboration at √ s N N = 2760 GeV with very high quality of data description χ 2 /dof = 1.07. Note that compared to other versions of the hadron resonance gas model with the hard-core repulsion [22,23,24] only the IST EoS is perfectly suited to take into account the second virial coefficients of such composite objects as light (anti-, hyper-) nuclei.…”

Section: Introductionmentioning

confidence: 99%

Alternative formulation of the induced surface and curvature tensions approach

Bugaev

2021

J. Phys. G: Nucl. Part. Phys.

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We develop a novel method to analyze the excluded volume of the multicomponent mixtures of classical hard spheres in the grand canonical ensemble. The method is based on the Laplace-Fourier transform technique and allows one to account for the fluctuations of the particle number density for the induced surface and curvature tensions equation of state. As a result one can go beyond the Van der Waals approximation by obtaining the suppression of the induced surface and curvature tensions coefficients at moderate and high packing fractions. In contrast to the standard induced surface and curvature tensions equation of state the suppression of these coefficients is not an exponential one, but a power-like one. The obtained alternative equation of state is further generalized to account for higher virial coefficients. This result is straightforwardly generalized to the case of quantum statistics.

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“…The evident success of the thermal model, which has attracted a lot of interest [14,[19][20][21][22][23][24][25][26][27][28][29][30][31], is very puzzling, as it is hard to expect that nuclei exist in the hot and dense fireball environment. The temperature is much bigger than a binding energy and the system is so dense that the inter-particle spacing is smaller than the typical internucleon distance in a nucleus.…”

Section: Introductionmentioning

confidence: 99%

Production of light nuclei at colliders – coalescence vs. thermal model

Mrówczyński

2020

Eur. Phys. J. Spec. Top.

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The production of light nuclei in relativistic heavy-ion collisions is well described by both the thermal model, where light nuclei are in equilibrium with hadrons of all species present in a fireball, and by the coalescence model, where light nuclei are formed due to final-state interactions after the fireball decays. We present and critically discuss the two models and further on we consider two proposals to falsify one of the models. The first proposal is to measure a yield of exotic nuclide 4Li and compare it to that of 4He. The ratio of yields of the nuclides is quite different in the thermal and coalescence models. The second proposal is to measure a hadron-deuteron correlation function which carries information whether a deuteron is emitted from a fireball together with all other hadrons, as assumed in the thermal model, or a deuteron is formed only after nucleons are emitted, as in the coalescence model. The p − 3He correlation function is of interest in context of both proposals: it is needed to obtain the yield of 4Li which decays into p and 3He, but the correlation function can also tell us about an origin of 3He.

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On separate chemical freeze-outs of hadrons and light (anti)nuclei in high energy nuclear collisions

Cited by 11 publications

References 31 publications

Second virial coefficients of light nuclear clusters and their chemical freeze-out in nuclear collisions

Second virial coefficients of light nuclear clusters and their chemical freeze-out in nuclear collisions

Alternative formulation of the induced surface and curvature tensions approach

Production of light nuclei at colliders – coalescence vs. thermal model

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