Roles of tensor force and pairing correlation in two-proton radioactivity of halo nuclei* *Supported by the National Natural Science Foundation of China (U1832120, 11675265), the Natural Science Foundation for Outstanding Young Scholars of Hebei Province, China (A2020210012), the Natural Science Foundation of Hebei Province, China (A2021210010), the Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy

Abstract

The tensor force and pairing correlation effects on the two-proton radioactivity of Mg and Si with a pronounced two-proton halo are explored in the framework of spherical Skyrme-Hartree-Fock-Bogoliubov theory. It is shown that the halo sizes are enhanced with the increase in the strength of the tensor force and pairing correlation. Furthermore, the increasing halo sizes lead to the enhancement of diproton emission. Then, the tensor force is found to have a small influence on the two-proton decay energies, and the two-proton decay energies calculated with strong surface pairing are smaller than those with weak mixed pairing. Because the two-proton decay energies are relatively large, the predicted order of magnitude of half-lives within the effective liquid drop model is not sensitive to the decay energy variation caused by the tensor force and pairing correlation, which has a value of approximately 10 s.