Электронный каталог

Статья

Vu Dong, T.
Recentrance of Proton-Neutron Pairing in Hot Nuclear Systems / T.Vu Dong, A.A.Dzhioev, A.I.Vdovin, N.Q.Hung. – Text : electronic // Physical Review C. – 2026. – Vol. 114, No. 3. – P. 034303. – URL: https://doi.org/10.1103/g1j9-wwp2. – Bibliogr.: 41.

We develop a generalized finite-temperature proton-neutron BCS framework using the superoperator formalism, incorporating both isovector and isoscalar monopole pairing channels. Numerical calculations for a schematic equidistant multilevel model and realistic even-even Ge isotopes demonstrate the emergence of proton-neutron (𝑝⁢𝑛) pairing reentrance in even-even asymmetric (𝑁>𝑍) nuclei with preexisting like-nucleon pairing correlations. This nonmonotonic behavior arises from thermal excitations that partially lift Pauli blocking of single-particle orbitals near the chemical potentials, thereby enlarging the phase space for 𝑝⁢𝑛 pair formation. We uncover a delicate interplay between thermal unblocking and like-nucleon pairing, which can either suppress or enhance 𝑝⁢𝑛 correlations depending on temperature and shell filling. A qualitative analysis of Fermi charge-exchange strength functions in hot 72 Ge , which neglects the residual interaction between thermal quasiparticles, suggests that 𝑝⁢𝑛 pairing reentrance may alter the transition strength distribution around 𝑇≈1 MeV. This indicates that finite-temperature 𝑝⁢𝑛 correlations could potentially impact stellar weak-interaction rates in 𝑟⁢𝑝-process and supernova environments



ОИЯИ = ОИЯИ (JINR)2026
Спец.(статьи,препринты) = С 341 в - Теория ядерной материи