Triplet-odd pairing in finite nuclear systems: Even-even singly closed nuclei
Abstract
Background: The appearance of the pairing condensate is an essential feature of many-fermion systems. There are two possible types of pairing: spin-singlet and spin-triplet. However, an open question remains as to whether the spin-triplet pairing condensate emerges in finite nuclei. Purpose: The aim of this work is to examine the coexistence of the spin-singlet and spin-triplet like-particle pairing condensates in nuclei. We also discuss the dependence on the type of pairing functional. Method: The Hartree-Fock-Bogoliubov calculations with a Skyrme local-pair energy-density functional (EDF) are performed to investigate the pairing condensate in the spherical ground states of Ca and Sn isotopes. Results: The spin-singlet pair EDF induces not only the spin-singlet but also the spin-triplet pairing condensates due to a strong spin-orbit splitting. By discarding the spin-orbit EDF, only the spin-singlet pairing condensate appears. The spin-triplet pair EDF, however, induces the spin-orbit splitting and accordingly the spin-singlet pairing condensate. Conclusions: The spin-orbit splitting plays an essential role in the coexistence of the spin-singlet and spin-triplet pairing condensates in nuclei.
Keywords
Cite
@article{arxiv.2308.02617,
title = {Triplet-odd pairing in finite nuclear systems: Even-even singly closed nuclei},
author = {Nobuo Hinohara and Tomohiro Oishi and Kenichi Yoshida},
journal= {arXiv preprint arXiv:2308.02617},
year = {2024}
}
Comments
9 pages, 6 figures