Abstract
We systematically study the properties of single-, and hypernuclei within the framework of relativistic mean-field model. The coupling constants are constrained according to the experimental data and previous theoretical efforts. By adding a hyperon to , we investigate its mean-field potentials, single-hyperon levels, density distributions, and binding energies, where the consequences of introducing different types of hyperons (, and ) are examined. In general, the and hyperons show similar behaviors in bulk properties since both of them are electroneutral and have similar coupling constants; hyperon owns the shallowest mean-field potential well with the most extended density distribution; and Coulomb interactions play vital roles in the charged , and hyperons. As a result, those hyperons have different impurity effects on the nuclear core . The tensor couplings are included and show remarkable effects on the spin-orbit splitting which even change the level ordering of hyperon. Finally, the single-hyperon binding energy of hypernuclei generally increases with the mass number. However, there is a turning point for hypernuclei at where the binding energy begins to decrease. This is mainly due to the increasing Coulomb repulsive potential at large proton numbers.
1 More- Received 26 May 2018
DOI:https://doi.org/10.1103/PhysRevC.98.024316
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