Short-range correlated pair formation and nuclear shell structure

Abstract

Short-range correlated (SRC) nucleon pairs, caused by brief, high-momentum interactions between two nucleons, are dominated by neutron-proton pairs with large relative and smaller center-of-mass momenta. However, which nucleons form pairs is not fully understood. Measurements of 40,48Ca and 54Fe showed that intra-shell pairing was much stronger than inter-shell pairing. We measured high- missing-momentum protons knocked out in electron scattering from selected nuclei with a range of shell configurations, A, and N/Z, including 9Be, 10,11B, 12C, 40,48Ca, 54Fe, and 197Au, focusing on the four light nuclei. Unexpectedly, we found that adding one proton to 9Be (to make 10B) increased the number of correlated protons far more than adding one neutron to 10B or adding one proton to 11B, perhaps due to the large spin (J = 3) of 10B or the unusual structure of 9Be. In addition, the increase in pairing probability from 9Be to 12C and from 40Ca to 54Fe was much steeper than the increase from 9Be to 197Au. This shows the importance of low-momentum nuclear structure on the probability of high-momentum nucleon pairing.

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BibTeX RIS

BibTeX

@misc{nguyen2026shortrange,
  title = {{Short-range correlated pair formation and nuclear shell structure}},
  author = {D. Nguyen and C. Yero and H. Szumila-Vance and F. Hauenstein and N. Swan and L. B. Weinstein and J. Kahlbow and A. Schmidt and E. Piasetzky and O. Hen and C. Ayerbe Gayoso and E. Cohen and P. Datta and A. Denniston and B. R. Devkota and M. Diefenthaler and C. Fogler and B. R. Gamage and D. Higinbotham and I. Korover and C. Morean and M. Nycz and M. Satnik and S. Seeds and P. Sharp and I. Shlush and M. Suresh and A. S. Tadepalli and R. Wagner and E. W. Wertz},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2606.07754},
  eprint = {2606.07754},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.07754},
}

RIS

TY  - UNPB
TI  - Short-range correlated pair formation and nuclear shell structure
AU  - D. Nguyen
AU  - C. Yero
AU  - H. Szumila-Vance
AU  - F. Hauenstein
AU  - N. Swan
AU  - L. B. Weinstein
AU  - J. Kahlbow
AU  - A. Schmidt
AU  - E. Piasetzky
AU  - O. Hen
AU  - C. Ayerbe Gayoso
AU  - E. Cohen
AU  - P. Datta
AU  - A. Denniston
AU  - B. R. Devkota
AU  - M. Diefenthaler
AU  - C. Fogler
AU  - B. R. Gamage
AU  - D. Higinbotham
AU  - I. Korover
AU  - C. Morean
AU  - M. Nycz
AU  - M. Satnik
AU  - S. Seeds
AU  - P. Sharp
AU  - I. Shlush
AU  - M. Suresh
AU  - A. S. Tadepalli
AU  - R. Wagner
AU  - E. W. Wertz
PY  - 2026
DA  - 2026/10/27
PB  - arXiv
DO  - 10.48550/arxiv.2606.07754
UR  - https://arxiv.org/abs/2606.07754
AB  - Short-range correlated (SRC) nucleon pairs, caused by brief, high-momentum interactions between two nucleons, are dominated by neutron-proton pairs with large relative and smaller center-of-mass momenta. However, which nucleons form pairs is not fully understood. Measurements of 40,48Ca and 54Fe showed that intra-shell pairing was much stronger than inter-shell pairing. We measured high- missing-momentum protons knocked out in electron scattering from selected nuclei with a range of shell configurations, A, and N/Z, including 9Be, 10,11B, 12C, 40,48Ca, 54Fe, and 197Au, focusing on the four light nuclei. Unexpectedly, we found that adding one proton to 9Be (to make 10B) increased the number of correlated protons far more than adding one neutron to 10B or adding one proton to 11B, perhaps due to the large spin (J = 3) of 10B or the unusual structure of 9Be. In addition, the increase in pairing probability from 9Be to 12C and from 40Ca to 54Fe was much steeper than the increase from 9Be to 197Au. This shows the importance of low-momentum nuclear structure on the probability of high-momentum nucleon pairing.
ER  -

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