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PreprintCC BY-SA 4.0arXiv

Emergence of the nuclear halo in 22C: Bridging shape and shell

  • Xiang-Xiang Sun
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Abstract

The structure of 22C remains unsettled more than a decade after the 2010 reaction-cross-section measurement. The nucleus sits at N=16, where the spherical closure of 24O competes with the deformation of 20C. We develop a multi-reference density functional approach that restores particle number and angular momentum and mixes quadrupole shapes while retaining the continuum. The calculation gives a deformed two-neutron halo with matter radius of 3.29 fm, closer to the carbon-target extraction, and a long s-wave tail. The ground state 01+ is dominated by oblate configurations, with B(E2) values comparable to those of 20C. The valence neutrons occupy mixed sd orbits; the N=16 closure established in 24O is substantially weakened in 22C.

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Cite

BibTeXRIS
BibTeX
@misc{sun2026emergence,
  title = {{Emergence of the nuclear halo in $^22$C: Bridging shape and shell}},
  author = {Xiang-Xiang Sun},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.39753},
  eprint = {2609.39753},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.39753},
  note = {CC BY-SA 4.0},
}
RIS
TY  - UNPB
TI  - Emergence of the nuclear halo in ^22C: Bridging shape and shell
AU  - Xiang-Xiang Sun
PY  - 2026
DA  - 2026/09/30
PB  - arXiv
DO  - 10.48550/arxiv.2609.39753
UR  - https://arxiv.org/abs/2609.39753
AB  - The structure of ^22C remains unsettled more than a decade after the 2010 reaction-cross-section measurement. The nucleus sits at N=16, where the spherical closure of ^24O competes with the deformation of ^20C. We develop a multi-reference density functional approach that restores particle number and angular momentum and mixes quadrupole shapes while retaining the continuum. The calculation gives a deformed two-neutron halo with matter radius of 3.29 fm, closer to the carbon-target extraction, and a long s-wave tail. The ground state 0_1^+ is dominated by oblate configurations, with B(E2) values comparable to those of ^20C. The valence neutrons occupy mixed sd orbits; the N=16 closure established in ^24O is substantially weakened in ^22C.
ER  -