Multicomponent van der Waals Model of a Nuclear Fireball in the Freeze-Out Stage
Abstract
A model of a two-component van der Waals gas is proposed to describe the hadronic stages of nuclear
fireball evolution during the cooling phase. During the initial stage of hadronization, when mesons are
dominant, a two-component meson model (π0 and π+ mesons) with an effective two-particle interaction
potential in the form of a rectangular well is suggested. In the later stages of hadronization, when almost all
mesons have decayed, a two-component nucleon model consisting of protons and neutrons is proposed,
incorporating the corresponding effective rectangular nucleon potential. The saddle point method has been
utilized for analytical computations of the partition function. This approach has facilitated the consistent
derivation of analytical expressions for both pressure and density, considering the finite dimensions of the
system, as well as analytical expressions for chemical potentials. It is envisaged that the proposed models
and resulting equations can be employed for analyzing experimental data related to the quantitative
attributes of particle yields of various types in the final state arising from the hadronic stages of nuclear
fireball evolution. Additionally, these models can aid in determining the critical parameters of the system
during high-energy nucleus-nucleus collisions. It is demonstrated that in the single-component case, the
model’s results for the baryonic chemical potential correlate with calculations by other authors.
References
2. P. Braun-Munzinger, J. Stachel. Dynamics of ultra-relativistic nuclear collisions with heavy beams: An experimental overview. Nucl. Phys. A 638 (1998) 3C.
3. J. Cleymans, H. Satz. Thermal Hadron Production in High Energy Heavy Ion Collisions. Z. Phys. C 57 (1993) 135.
4. J. Cleymans et al. The hadronisation of a quark-gluon plasma. Z. Phys. C 58 (1993) 347.
5. K. Redlich et al. Hadronisation of quark-gluon plasma. Nucl. Phys. A 566 (1994) 391.
6. P. Braun-Munzinger et al. Thermal equilibration and expansion in nucleus-nucleus collisions at the AGS. Phys. Lett. B 344 (1995) 43.
7. P. Braun-Munzinger et al. Thermal and hadrochemical equilibration in nucleus-nucleus collisions at the SPS. Phys. Lett. B 365 (1996) 1.
8. R.A. Ritchie, M.I. Gorenstein, H.G. Miller. The excluded volume hadron gas model and pion production at the SPS. Z. Phys. C 75 (1997) 535.
9. G.D. Yen et al. Excluded volume hadron gas model for particle number ratios in collisions. Phys. Rev. C 56 (1997) 2210.
10. G.D. Yen at al. Chemical freezeout in relativistic collisions: is it close to the quark-gluon plasma? J. Phys. G 24 (1998) 1777.
11. M.I. Gorenstein, A.P. Kostyuk, Ya.D Krivenko. Van der Waals excluded-volume model of multicomponent hadron gas. J. Phys. G 25 (1999) 75.
12. Ya.D. Krivenko-Emetov. Attractive inter-particle force in van der Waals model of multicomponent hadron gas in the grand canonical ensemble. 2019 arXiv:1909.08441v1 [hep-ph]; Ya.D. Krivenko-Emetov. Interparticle attractive forces account of the multicomponent hadron gas in the grand canonical ensenble. Book of abstract of the 24th Annual Scientific Conf. of Inst. for Nucl. Research, Kyiv, Ukraine, April 10-13, 2017 (Kyiv, 2017) p. 36.
13. V. Vovchenko at al. Multicomponent van der Waals equation of state: Applications in nuclear and hadronic physics. Phys. Rev. C 96 (2017) 045202.
14. Ya.D. Krivenko-Emetov. Finite volume effects in the two-component van der Waals model in relativistic nucleus-nucleus collisions of heavy ions. Book of abstract of the 28th Annual Scientific Conf. of Inst. for Nucl. Research, Kyiv, Ukraine, Sept. 27 – Oct. 01, 2021 (Kyiv, 2021) p. 27.
15. Quark-Gluon Plasma (QGP) Physics with ALICE at the CERN LHC. URL: https://indico.cern.ch/event/1013634/contributions/4255256/attachments/2227069/3772748/IoP-April2021.pdf.
16. Krivenko-Emetov, Ya.D. Pressure corrections for one-component and two-component van der Waals nuclear fireball models at the freezeout stage. Book of abstract of 29th Annual Scientific Conf. of Inst. for Nucl. Research, Kyiv, Sept. 26 – 30, 2022, p.21-22. (Ukr). D. Sokolyuk, Ya. Krivenko-Emetov. Two-component van der Waals model of a nuclear fireball in the cooling stage (freezeout). Mat. of XX All-Ukrainian science and practice conf. students, postgraduates and young scientists “Theoretical and applied problems of physics, mathematics and informatics”, Kyiv, June 15, 2022 (Igor Sikorsky Kyiv Polytechnic Institute, 2022) p. 88. (Ukr).
17. L.D. Landau, E.M. Lifshitz. Statistical Physics Vol. 5 of Course of Theoretical Physics. (2 ed. Addison Wesley, 1969) 484 p.
18. R. Kubo. Statistical mechanics (Moskva: Mir, 1967) 452 p. (Rus).
19. R.P. Feynman. Statistical Mechanics: a set of lectures. Advanced Book Classics (2 ed. Perseus Books, Reading, Mass., 1998) 354 p.
20. A.M. Fedorchenko. Theoretical physics. T.2. Quantum mechanics, thermodynamics and statistical physics (Kyiv: Vyshcha shkola, 1993) 415 p. (Ukr).
21. M.V. Fedoruk. Saddle point method (Moskva, 1977) 368 p. (Rus).
This work is licensed under a Creative Commons Attribution 4.0 International License.
Letters in High Energy Physics (LHEP) is an open access journal published by Andromeda Publishing and Education Services. The articles in LHEP are distributed according to the terms of the creative commons license CC-BY 4.0. Under the terms of this license, copyright is retained by the author while use, distribution and reproduction in any medium are permitted provided proper credit is given to original authors and sources.
Terms of Submission
By submitting an article for publication in LHEP, the submitting author asserts that:
1. The article presents original contributions by the author(s) which have not been published previously in a peer-reviewed medium and are not subject to copyright protection.
2. The co-authors of the article, if any, as well as any institution whose approval is required, agree to the publication of the article in LHEP.