Электронный каталог

Статья

Shen, L.-Y.
Ab Initio Quadrupole-Invariant Analysis of Neutron-Rich Deformed Nuclei Around N=28 / L.-Y.Shen, H.-Y.Zhu, [a.o.]. – Text : electronic // Atoms. – 2026. – Vol. 14, No. 8. – P. 69. – URL: https://doi.org/10.3390/atoms14080069. – Bibliogr.: 74.

We present an ab initio quadrupole-invariant study of neutron-rich nuclei around 𝑁=28 . Effective Hamiltonians and consistently evolved 𝐸2 operators are obtained from chiral NN+3N interactions using the ab initio valence-space in-medium similarity renormalization group, and the resulting 𝐸2 matrix elements are used to extract the deformation parameters. Along the even–even 𝑁=28 isotonic chain, the 𝛽 values increase systematically from *4*8Ca to *4*0Mg, providing a direct deformation signature of the weakening of the 𝑁=28 shell closure. The extracted 𝛽 and 𝛾 values show a prolate–oblate–triaxial evolution of the 0*+&sub(1) states from *4*0Mg to *4*2Si and *4*4S, while the 0*+&sub(2) states remain mainly in the prolate-to-triaxial region. Extending the analysis to the neighboring 𝑁=27 and 29 isotones, we find a systematic evolution from strongly prolate Mg isotopes, to oblate-side Si isotopes, and to prolate-to-triaxial S isotopes. These results provide a unified picture of quadrupole deformation, triaxiality, and configuration coexistence around 𝑁=28 .



ОИЯИ = ОИЯИ (JINR)2026
Спец.(статьи,препринты) = С 341 а - Различные модели ядер$