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arXiv · 1811.02924

Phase transitions and Bose-Einstein condensation in alpha-nucleon matter

L. M. Satarov·I. N. Mishustin·A. Motornenko·V. Vovchenko·M. I. Gorenstein·H. Stoecker
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Abstract

The equation of state and phase diagram of isospin-symmetric chemically equilibrated mixture of alpha particles and nucleons are studied in the mean-field approximation. The model takes into account the effects of Fermi and Bose statistics for nucleons and alphas, respectively. We use Skyrme-like parametrization of the mean-field potentials as functions of partial densities, which contain both attractive and repulsive terms. Parameters of these potentials are chosen by fitting known properties of pure nucleon- and pure alpha matter at zero temperature. The sensitivity of results to the choice of the alpha-nucleon attraction strength is investigated. The phase diagram of the alpha-nucleon mixture is studied with a special attention paid to the liquid-gas phase transitions and the Bose-Einstein condensation of alpha particles. We have found two first-order phase transitions, stable and metastable, which differ significantly by the fractions of alpha particles. It is shown that states with alpha condensate are metastable.

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L. M. Satarov, I. N. Mishustin, A. Motornenko, V. Vovchenko, M. I. Gorenstein, H. Stoecker. 2018-11-07. Phase transitions and Bose-Einstein condensation in alpha-nucleon matter. https://doi.org/10.1103/physrevc.99.024909

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