Possible shape coexistence in Ne isotopes and the impurity effect of Λ hyperon

The possible shape coexistence in even-even Ne isotopes and the impurity effects of the s(Lambda) and p(Lambda) hyperons are explored employing the multidimensionally constrained relativistic-mean-field (MDC-RMF) model with the PK1 parameter set for the NN interaction and PK1-Y1 for the Lambda N interaction. The quadrupole deformation potential energy surfaces (PESs), nuclear deformations, nuclear radii, binding energies, and density distributions of the hypernuclei and core nuclei are examined. The possible shape coexistence in Ne-24,Ne-26,Ne-28 is predicted with small energy differences of 140, 336, and 128 keV, respectively, between the two local energy minima. Different impurity effects of the s(Lambda) and p(Lambda) hyperons are revealed. The s(Lambda) hyperon exhibits clear shrinkage effects, which reduce the nuclear size and facilitate a spherical nuclear shape. The prolate p(Lambda) hyperon on the 1/2(-)[110] orbital renders the nuclear shape more prolate, while the oblate p(Lambda) hyperon on the 3/2(-)[101] or 1/2(-)[101] orbital renders the nuclei more oblate. Moreover, the Lambda hyperon can increase the probabilities of the shape coexistence by reducing the energy differences between the two local energy minima, although the shape coexistence may disappear owing to the vanishment of one energy minimum on the flat energy surface.

Automated summary

This study explores the possible shape coexistence in Ne isotopes and the impurity effects of s(Lambda) and p(Lambda) hyperons using the multidimensionally constrained relativistic-mean-field model. Predictions of shape coexistence in Ne-24, Ne-26, Ne-28 nuclei are made with small energy differences between energy minima. Different effects of s(Lambda) and p(Lambda) hyperons on nuclear shape are revealed.