open access

https://hdl.handle.net/2115/92179

Soft dipole resonance in C8 and its isospin symmetry with He8

英語

2023-03-14

American Physical Society (APS)

Physical Review C

107(3)

034305

We investigate the soft dipole resonance in the proton-rich nucleus 86 C2, which is a collective dipole oscillation of four valence protons against the α core, and discuss the isospin symmetry with the mirror nucleus 82 He6. We use the α + N + N + N + N five-body cluster model and many-body resonances are obtained using the complex-scaling method. The 1− resonance of 86 C2 is confirmed at the excitation energy of 13 MeV with a large decay width of 24 MeV, and its structure is similar to the soft dipole resonance in 82 He6, such as the configuration mixing and the spatial properties. These results indicate a good isospin ymmetry in the soft dipole resonances of two nuclei with a common collective excitation of multiproton and multineutron, while the ground states of two nuclei show different properties due to the Coulomb repulsion of valence protons in 86 C2, leading to the symmetry breaking. In conclusion, the appearance of the isospin symmetry differs depending on the states of 86 C2 and 82 He6.

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