Predictions for neutron-tagged Coulomb dissociation in ultraperipheral Ru+Ru and Zr+Zr collisions
Abstract
The photonuclear response reflects nuclear structure and the dynamics of excitation and decay, with neutron-emission channels retaining information that can be obscured in inclusive dissociation yields. We calculate specified-side and mutual neutron-tagged Coulomb-dissociation cross sections in ultraperipheral 9644Ru+9644Ru and 9640Zr+9640Zr collisions at √(sNN)=200 GeV using an impact-parameter-dependent equivalent-photon framework with photonuclear inputs from TALYS calculations and ENDF evaluations. Across the two input sets, the predicted Ru/Zr ratios span $1.54−1.71$ for exact 1n and $2.49−3.09$ for 1n1n, while inclusive Xn (at least one neutron) and XnXn ratios remain near unity at $0.96−0.99$ and $1.05−1.10$, respectively. The one-neutron ratios lie well above the corresponding flux-only Z2 and Z4 charge-scaling references, reflecting differences in the low-energy one-neutron response that are amplified by mutual tagging. This topology hierarchy identifies neutron-tagged isobar ratios as sensitive probes of photonuclear response, revealing response differences hidden in inclusive dissociation. These calculations also provide neutron-emission inputs for neutron-tagged vector-meson photoproduction in isobar collisions.
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BibTeX
@misc{nasrulloh2026predictions,
title = {{Predictions for neutron-tagged Coulomb dissociation in ultraperipheral Ru+Ru and Zr+Zr collisions}},
author = {Huda Nasrulloh and Xinbai Li and Zebo Tang and Kaiyang Wang and Luobing Wang and Xin Wu and Wangmei Zha},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.12951},
eprint = {2610.12951},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.12951},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Predictions for neutron-tagged Coulomb dissociation in ultraperipheral Ru+Ru and Zr+Zr collisions
AU - Huda Nasrulloh
AU - Xinbai Li
AU - Zebo Tang
AU - Kaiyang Wang
AU - Luobing Wang
AU - Xin Wu
AU - Wangmei Zha
PY - 2026
DA - 2026/10/09
PB - arXiv
DO - 10.48550/arxiv.2610.12951
UR - https://arxiv.org/abs/2610.12951
AB - The photonuclear response reflects nuclear structure and the dynamics of excitation and decay, with neutron-emission channels retaining information that can be obscured in inclusive dissociation yields. We calculate specified-side and mutual neutron-tagged Coulomb-dissociation cross sections in ultraperipheral ^96_44Ru+^96_44Ru and ^96_40Zr+^96_40Zr collisions at √(s_NN)=200 GeV using an impact-parameter-dependent equivalent-photon framework with photonuclear inputs from TALYS calculations and ENDF evaluations. Across the two input sets, the predicted Ru/Zr ratios span $1.54−1.71$ for exact 1n and $2.49−3.09$ for 1n1n, while inclusive Xn (at least one neutron) and XnXn ratios remain near unity at $0.96−0.99$ and $1.05−1.10$, respectively. The one-neutron ratios lie well above the corresponding flux-only Z^2 and Z^4 charge-scaling references, reflecting differences in the low-energy one-neutron response that are amplified by mutual tagging. This topology hierarchy identifies neutron-tagged isobar ratios as sensitive probes of photonuclear response, revealing response differences hidden in inclusive dissociation. These calculations also provide neutron-emission inputs for neutron-tagged vector-meson photoproduction in isobar collisions.
ER -