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

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

2011-10-11

arxiv.org/abs/1110.2242v1

Physics Letters B 705 (2011) 240--243

Physics

Nuclear Physics

Nuclear Theory

9 pages, 3 figures, accepted by PLB

Scientific paper

10.1016/j.physletb.2011.10.020

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-pngamma is cancelled out by using the ratio of hard photon spectra R_{12C+12C/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+12C and p+2H. A reduction factor sigma_pn^medium/sigma_pn^free of about 0.5 ~ 0.7 around saturation density is obtained by comparing with the existing experimental data.

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