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

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Abstract

The possible shape coexistence in even-even Ne isotopes and the impurity effects of the sΛ and pΛ 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 ΛN 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 24,26,28Ne is predicted with small energy differences of 140, 336, and 128 keV, respectively, between the two local energy minima. Different impurity effects of the sΛ and pΛ hyperons are revealed. The sΛ hyperon exhibits clear shrinkage effects, which reduce the nuclear size and facilitate a spherical nuclear shape. The prolate pΛ hyperon on the 1/2−[110] orbital renders the nuclear shape more prolate, while the oblate pΛ hyperon on the 3/2−[101] or 1/2−[101] orbital renders the nuclei more oblate. Moreover, the Λ 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.

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Authors and Affiliations

  1. School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450001, China

    Chen Chen, Qian-Kun Sun, Yu-Xiao Li & Ting-Ting Sun

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  1. Chen Chen
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  2. Qian-Kun Sun
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  3. Yu-Xiao Li
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  4. Ting-Ting Sun
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Correspondence to Ting-Ting Sun.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant No. U2032141), the Natural Science Foundation of Henan Province (Grant Nos. 202300410479, and 202300410480), the Foundation of Fundamental Research for Young Teachers of Zhengzhou University (Grant No. JC202041041), and the Physics Research and Development Program of Zhengzhou University (Grant No. 32410217). The theoretical calculation was supported by the nuclear data storage system in Zhengzhou University. The authors thank Prof. Shan-Gui Zhou for providing the MDC-RMF code and valuable suggestions. Chen Chen expresses thanks to Dr. Shi-Sheng Zhang and Dr. Wei Zhang for the fruitful discussions.

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Chen, C., Sun, QK., Li, YX. et al. Possible shape coexistence in Ne isotopes and the impurity effect of Λ hyperon. Sci. China Phys. Mech. Astron. 64, 282011 (2021). https://doi.org/10.1007/s11433-021-1721-1

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  • DOI: https://doi.org/10.1007/s11433-021-1721-1

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