2025/11/14 by Zhang, Shu-Tong, Luo, Wen, Pang, Dan-Yang +6
#FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th)
paper · doi:10.48550/arxiv.2511.10955
We demonstrate to extract 88Y(n,γ) cross sections using the (p,p'γ) surrogate reaction with proper treatment of the spin-parity distribution of the compound nucleus 89Y. Experimental data of both γ-decay probability and γ-ray strength function are used to constrain the nuclear model parameters within a computational framework combining the Bayesian optimization and Markov chain Monte Carlo method, which helps to significantly reduce the (n,γ) data uncertainty. The 88Y(n,γ) cross sections are then extracted with a narrow uncertainty of 7.6%-23.1% within neutron energy range of 0.01 to 3.0 MeV for the first time, where no experimental data are available. Moreover, our method is verified with the 88Sr(p,γ) reaction, of which the measured data are available for comparison. This work opens interesting perspectives on the matter of extracting (n,γ) reaction cross sections on unstable nuclei as surrogate reaction experiments are becoming widely available.