Soft dipole resonance in $^8$C and its isospin symmetry with $^8$He
| Autor: | Myo, Takayuki, Kato, Kiyoshi |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Physical Review C 107, 034305 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevC.107.034305 |
| Popis: | We investigate the soft dipole resonance in the proton-rich nucleus $^8_6$C$_2$, which is a collective dipole oscillation of four valence protons against the $\alpha$ core,and discuss the isospin symmetry with the mirror nucleus $^8_2$He$_6$. We use the $\alpha+N+N+N+N$ five-body cluster model and many-body resonances are obtained using the complex-scaling method. The $1^-$ resonance of $^8_6$C$_2$ 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 $^8_2$He$_6$, such as the configuration mixing and the spatial properties. These results indicate a good isospin symmetry 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 $^8_6$C$_2$, leading to the symmetry breaking. In conclusion, the appearance of the isospin symmetry differs depending on the states of $^8_6$C$_2$ and $^8_2$He$_6$. Comment: 7 pages, 4 figures |
| Databáze: | arXiv |
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