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Classical excluded volume of loosely bound light (anti) nuclei and their chemical freeze-out in heavy ion collisions

Boris E. Grinyuk

Bogolyubov Institute for Theoretical Physics, Metrologichna str. 14B, Kyiv 03680, Ukraine

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Kyrill A. Bugaev

Bogolyubov Institute for Theoretical Physics, Metrologichna str. 14B, Kyiv 03680, Ukraine

Department of Physics, Taras Shevchenko National, University of Kyiv, 03022 Kyiv, Ukraine

E-mail Address: [email protected]

Corresponding author.

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Violetta V. Sagun

Bogolyubov Institute for Theoretical Physics, Metrologichna str. 14B, Kyiv 03680, Ukraine

CFisUC, Department of Physics, University of Coimbra, Coimbra 3004-516 Portugal

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Oleksii I. Ivanytskyi

Bogolyubov Institute for Theoretical Physics, Metrologichna str. 14B, Kyiv 03680, Ukraine

CFisUC, Department of Physics, University of Coimbra, Coimbra 3004-516 Portugal

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Dmitry L. Borisyuk

Bogolyubov Institute for Theoretical Physics, Metrologichna str. 14B, Kyiv 03680, Ukraine

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Anatoly S. Zhokhin

Bogolyubov Institute for Theoretical Physics, Metrologichna str. 14B, Kyiv 03680, Ukraine

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Gennady M. Zinovjev

Bogolyubov Institute for Theoretical Physics, Metrologichna str. 14B, Kyiv 03680, Ukraine

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David B. Blaschke

Institute of Theoretical Physics, University of Wroclaw, Max Born Pl. 1. 50-204 Wroclaw, Poland

Bogoliubov Laboratory of Theoretical Physics, JINR Dubna, Joliot-Curie Str. 6, Dubna 141980, Russia

National Research Nuclear University (MEPhI), Kashirskoe Shosse 31, Moscow 115409, Russia

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Larissa V. Bravina

University of Oslo, POB 1048 Blindern, Oslo N-0316, Norway

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Evgeny E. Zabrodin

University of Oslo, POB 1048 Blindern, Oslo N-0316, Norway

Skobeltsyn Institute of Nuclear Physics, Moscow State University, 119899 Moscow, Russia

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Edward G. Nikonov

Laboratory for Information Technologies, JINR Dubna, Joliot-Curie str. 6, 141980 Dubna, Russia

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Glennys Farrar

New York University, 726 Broadway, New York, New York, USA

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Sonia Kabana

Instituto de Alta Investigación, Universidad de Tarapacá, Casilla 7D, Arica, Chile

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Sergey V. Kuleshov

Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile

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, and

Arkadiy V. Taranenko

National Research Nuclear University (MEPhI), Kashirskoe Shosse 31, Moscow 115409, Russia

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https://doi.org/10.1142/S0218301320400091Cited by:1 (Source: Crossref)

This article is part of the issue:

Special Issue on New Frontiers in Physics — Selected Papers of ICNFP 2019
Guest Editors: L. Bravina, S. Kabana, V. Volkova and V. I. Zakharov

Abstract

From the analysis of light (anti)nuclei multiplicities that were measured recently by the ALICE collaboration in Pb+Pb collisions at the center-of-mass collision energy $\sqrt{s_{N N}} = 2.76$ TeV, there arose a highly nontrivial question about the excluded volume of composite particles. Surprisingly, the hadron resonance gas model (HRGM) is able to perfectly describe the light (anti) nuclei multiplicities under various assumptions. Thus, one can consider the (anti)nuclei with a vanishing hard-core radius (as the point-like particles) or with the hard-core radius of proton, but the fit quality is the same for these assumptions. It is clear, however, that such assumptions are unphysical. Hence we obtain a formula for the classical excluded volume of loosely bound light nuclei consisting of A baryons. To implement a new formula into the HRGM, we have to modify the induced surface tension concept to treat the hadrons and (anti)nuclei on the same footing. We perform a thorough analysis of hadronic and (anti)nuclei multiplicities measured by the ALICE collaboration. The HRGM with the induced surface tension allows us to verify different assumptions on the values of hard-core radii and different scenarios of chemical freeze-out of (anti)nuclei. It is shown that the unprecedentedly high quality of fit $χ_{tot}^{2} / dof ≃ 0.724$ is achieved, if the chemical freeze-out temperature of hadrons is about $T_{h} = 150$ MeV, while the one for all (anti)nuclei is $T_{A} = 174 - 175.2$ MeV.

Keywords:

PACS: 25.75.Ag, 24.10.Pa

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