\textit{Ab initio} no-core shell model calculations of the electric dipole polarizabilities and…

Abstract

We present \textit{ab initio} no-core shell-model calculations of the electric dipole (E1) polarizabilities and photoabsorption cross sections of the A=3 mirror nuclei ³H and ³He using the Daejeon16 nucleon-nucleon interaction. The polarizabilities are obtained by direct summation over discretized continuum states in the harmonic-oscillator basis, while the same spectral information is used to reconstruct the cross sections. This work provides the first extension of the approach from the spin-zero ⁴He to nonzero-spin nuclei by calculating the 1/2^- and 3/2^- final-state contributions separately and demonstrating their model-space convergence. In both nuclei, the 3/2^- contribution is approximately twice the 1/2^- contribution. After quantifying finite-basis and excitation-energy-truncation uncertainties, we identify a clear difference between the mirror polarizabilities, induced entirely by the Coulomb interaction because the Daejeon16 interaction is isospin symmetric. The reconstructed cross sections remain stable under variations of the inversion parameters of the Lorentz integral transform and exhibit the same angular-momentum hierarchy. These results extend the discretized-continuum approach to integrated and energy-resolved E1 observables in nonzero-spin nuclei with multiple final-state angular momenta.

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BibTeX RIS

BibTeX

@misc{zhao2026textitab,
  title = {{\textitAb initio no-core shell model calculations of the electric dipole polarizabilities and photoabsorption cross sections of the $A=3$ mirror nuclei}},
  author = {H. T. Zhao and C. Y. Zhai and J. P. Vary and H. Li and J. M. Dong and H. J. Ong and X. Zhao and P. J. Fasano and A. M. Shirokov and J. Chen and D. Y. Tao and B. Zhou and C. Ji and P. Yin},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.29711},
  eprint = {2610.29711},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.29711},
}

RIS

TY  - UNPB
TI  - \textit{Ab initio} no-core shell model calculations of the electric dipole polarizabilities and photoabsorption cross sections of the A=3 mirror nuclei
AU  - H. T. Zhao
AU  - C. Y. Zhai
AU  - J. P. Vary
AU  - H. Li
AU  - J. M. Dong
AU  - H. J. Ong
AU  - X. Zhao
AU  - P. J. Fasano
AU  - A. M. Shirokov
AU  - J. Chen
AU  - D. Y. Tao
AU  - B. Zhou
AU  - C. Ji
AU  - P. Yin
PY  - 2026
DA  - 2026/10/22
PB  - arXiv
DO  - 10.48550/arxiv.2610.29711
UR  - https://arxiv.org/abs/2610.29711
AB  - We present \textit{ab initio} no-core shell-model calculations of the electric dipole (E1) polarizabilities and photoabsorption cross sections of the A=3 mirror nuclei ^3H and ^3He using the Daejeon16 nucleon-nucleon interaction. The polarizabilities are obtained by direct summation over discretized continuum states in the harmonic-oscillator basis, while the same spectral information is used to reconstruct the cross sections. This work provides the first extension of the approach from the spin-zero ^4He to nonzero-spin nuclei by calculating the 1/2^- and 3/2^- final-state contributions separately and demonstrating their model-space convergence. In both nuclei, the 3/2^- contribution is approximately twice the 1/2^- contribution. After quantifying finite-basis and excitation-energy-truncation uncertainties, we identify a clear difference between the mirror polarizabilities, induced entirely by the Coulomb interaction because the Daejeon16 interaction is isospin symmetric. The reconstructed cross sections remain stable under variations of the inversion parameters of the Lorentz integral transform and exhibit the same angular-momentum hierarchy. These results extend the discretized-continuum approach to integrated and energy-resolved E1 observables in nonzero-spin nuclei with multiple final-state angular momenta.
ER  -

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