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PreprintarXiv licencearXiv

Intruder-driven mirror energy differences between 29Cl and 29Mg studied with antisymmetrized molecular dynamics

  • Dae Ik Kim
  • Masaaki Kimura
  • Chang-Hwan Lee
  • Youngman Kim
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Abstract

To clarify the mirror energy differences (MEDs) of the proton-unbound nucleus 29Cl and their microscopic origins, we investigate the low-lying states of the 29Cl-29Mg mirror pair using antisymmetrized molecular dynamics. The calculation reasonably reproduces the normal and intruder states of 29Mg, while suggesting alternative spin-parity assignments for 29Cl. The 1/2+ and 3/2+ states are predicted to form a nearly degenerate ground-state doublet with a small MED because of their similar intrinsic structures. In contrast, the 3/2- and 7/2- intruder states exhibit large negative MEDs and are assigned to the observed resonances at approximately 500~keV and 1.1~MeV, respectively. Their large MEDs originate from the reduced Coulomb energies associated with the stronger deformation and spatially extended proton distributions in the intruder configurations.

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Cite

BibTeXRIS
BibTeX
@misc{kim2026intruderdriven,
  title = {{Intruder-driven mirror energy differences between $^29$Cl and $^29$Mg studied with antisymmetrized molecular dynamics}},
  author = {Dae Ik Kim and Masaaki Kimura and Chang-Hwan Lee and Youngman Kim},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2607.26546},
  eprint = {2607.26546},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.26546},
}
RIS
TY  - UNPB
TI  - Intruder-driven mirror energy differences between ^29Cl and ^29Mg studied with antisymmetrized molecular dynamics
AU  - Dae Ik Kim
AU  - Masaaki Kimura
AU  - Chang-Hwan Lee
AU  - Youngman Kim
PY  - 2026
DA  - 2026/09/30
PB  - arXiv
DO  - 10.48550/arxiv.2607.26546
UR  - https://arxiv.org/abs/2607.26546
AB  - To clarify the mirror energy differences (MEDs) of the proton-unbound nucleus ^29Cl and their microscopic origins, we investigate the low-lying states of the ^29Cl-^29Mg mirror pair using antisymmetrized molecular dynamics. The calculation reasonably reproduces the normal and intruder states of ^29Mg, while suggesting alternative spin-parity assignments for ^29Cl. The 1/2^+ and 3/2^+ states are predicted to form a nearly degenerate ground-state doublet with a small MED because of their similar intrinsic structures. In contrast, the 3/2^- and 7/2^- intruder states exhibit large negative MEDs and are assigned to the observed resonances at approximately 500~keV and 1.1~MeV, respectively. Their large MEDs originate from the reduced Coulomb energies associated with the stronger deformation and spatially extended proton distributions in the intruder configurations.
ER  -