title: Medium modified two-body scattering amplitude from proton-nucleus total cross-sections.
abstract: Recently (R.K. Tripathi, J.W. Wilson, F.A. Cucinotta, Nucl. Instr. and Meth. B 145 (1998) 277; R.K. Tripathi, F.A. Cucinotta, J.W. Wilson, NASA-TP-1998-208438), we have extracted nucleon-nucleon (N-N) cross-sections in the medium directly from experiment. The in-medium N-N cross-sections form the basic ingredients of several heavy-ion scattering approaches including the coupled-channel approach developed at the NASA Langley Research Center. Here, we investigate the ratio of real to imaginary part of the two-body scattering amplitude in the medium. These ratios are used in combination with the in-medium N-N cross-sections to calculate total proton-nucleus cross-sections. The agreement is excellent with the available experimental data. These cross-sections are needed for the radiation risk assessment of space missions.
authors.affiliation: NASA Langley Research Center, Hampton, VA 23681-0001, USA. r.k.tripathi@larc.nasa.gov
authors.forename: R K
authors.initials: RK
authors.lastname: Tripathi
authors.forename: J W
authors.initials: JW
authors.lastname: Wilson
authors.forename: F A
authors.initials: FA
authors.lastname: Cucinotta
mesh_terms: D000535:Aluminum; D001608:Beryllium; D002244:Carbon; D019471:Elementary Particle Interactions; D004601:Elementary Particles; D020450:Heavy Ions; D007501:Iron; D007854:Lead; D011522:Protons; D011829:Radiation Dosage; D012542:Scattering, Radiation; D013026:Space Flight; D014501:Uranium
chemical_list: D011522:Protons; D007854:Lead; D014501:Uranium; D002244:Carbon; D000535:Aluminum; D007501:Iron; D001608:Beryllium