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

Abstract

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.

9 pages, 3 figures, accepted by PLB

References in corpus (9)

• In-medium NN cross sections determined from stopping and collective flow in intermediate-energy heavy-ion collisions
• Transport parameters in neutron stars from in-medium NN cross sections
• In-medium effects on particle production in heavy ion collisions
• Neutron-proton bremsstrahlung from intermediate energy heavy-ion reactions as a probe of the nuclear symmetry energy?
• Effect of the momentum dependence of nuclear symmetry potential on pion-/pion+ ratio in heavy-ion collisions
• Differential cross section for neutron-proton bremsstrahlung
• Initialization effect in heavy-ion collisions at intermediate energies
• Can the nuclear symmetry potential at supra-saturation densities be negative?
• Nuclear collision in strong magnetic field

Cited by in corpus (11)

• Determination of the nuclear incompressibility from the rapidity-dependent elliptic flow in heavy-ion collisions at beam energies 0.4\emph{A} - 1.0\emph{A} GeV
• Probing nuclear symmetry energy at high densities using pion, kaon, eta and photon productions in heavy-ion collisions
• The interplay of short-range correlations and nuclear symmetry energy in hard photon productions from heavy-ion reactions at Fermi energies
• Cross-checking the symmetry energy at high densities
• Constraining nucleon high momentum in nuclei
• Probing proton transition momentum in neutron-rich matter
• Model dependence of isospin sensitive observables at high densities
• Effect of Delta potential on the pion-/pion+ ratio in heavy-ion collisions at intermediate energies
• Effects of nuclear symmetry energy and in-medium NN cross section in heavy-ion collisions at beam energies below the pion production threshold
• Probing in-medium nucleon-nucleon inelastic scattering cross section by using energetic n/p ratio
• Experimental Study of Bremsstrahlung Gamma Ray Emission and Short-Range Correlations in ${}^{124}$Sn+${}^{124}$Sn Collisions at 25 MeV/u