A direct probe of the in-medium pn scattering cross section

作者：Yong, Gao-Chan^*; Zuo, Wei; Zhang, Xun-Chao

来源：Physics Letters B, 2011, 705(3): 240-243.

DOI：10.1016/j.physletb.2011.10.020

• Neutron proton bremsstrahlung
• Hard photon production
• In-medium pn scattering cross section

Hard photon production from neutron-proton bremsstrahlung in intermediate energy heavy-ion reactions is examined as a probe of the in-medium pn scattering cross section within a transport model. Uncertainty of photon production probability pn -> pn gamma is cancelled out by using the ratio of hard photon spectra R-12C+ 12(C/p+n) (gamma) from two reactions. The in medium pn scattering cross section is constrained by using the ratio of hard photon production cross sections of proton-induced reactions p + C-12 and p + H-2. A reduction factor sigma(medium)(pn)/sigma(free)(pn) of about 0.5-0.7 around saturation density is obtained by comparing with the existing experimental data.

• 出版日期2011-11-11
• 单位中国科学院近代物理研究所