Фазові перетворення та конденсація Бозе–Ейнштейна в альфа-нуклонній матерії

• Main Authors: Satarov, L. M., Mishustin, I. N., Motornenko, A., Vovchenko, V., Gorenstein, M. I., Stoecker, H.
• Format: Article
• Language: English
• Published: Publishing house "Academperiodika" 2019
• Subjects: phase transitions; mean-field model; Bose–Einstein condensation; chemical equilibrium; -
• Online Access: https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2019384

The equation of state and the phase diagram of an isospin-symmetric chemically equilibrated mixture of a particles and nucleons (N) are studied in the mean-field approximation. We use a Skyrme-like parametrization of mean-field potentials as functions of the partial densities of particles. The parameters of these potentials are chosen by fitting the known properties of pure N- and pure a-matters at zero temperature. The sensitivity of results to the choice of the aN attraction strength is investigated. The phase diagram of the a − N mixture is studied with a special attention paid to the liquid-gas phase transitions and the Bose–Einstein condensation of a particles. We have found two first-order phase transitions, stable and metastable, which differ significantly by the fractions of a’s. It is shown that the states with a condensate are metastable.