Proton propagation studied through the A dependence of the (e,e prime p) reaction in the quasi-free region

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1990

OSTI ID:5224391

Garino, G

Proton propagation has been studied using the (e,e{prime}p) reaction in the quasifree region. The coincidence (e,e{prime}p) cross section was measured at proton angles of 50.1{degree}, 58.2{degree}, 67.9{degree} and 72.9{degree} at a beam energy of 779.5 MeV and an electron angle of 50.4{degree} for {sup 12}C, {sup 27}Al, {sup 58}Ni and {sup 181}Ta targets. The average proton energy was 175 MeV. The inclusive (e,e{prime}) cross sections were measured simultaneously. The ratio of the (e,e{prime}p) yield to the (e,e{prime}) yield was compared to that calculated in the PWIA and an experimental transmission defined. Comparison of the experimental transmissions to those obtained from a classical calculation of the transmission, in which a density dependent nucleon-nucleon cross section incorporated the medium effects, yielded a proton mean free path in nuclear matter of 3.8 {plus minus} .25 fm. This is longer than the 2.4 fm obtained from the simple approximation {lambda} = 1/{rho}{sigma} using the free nucleon-nucleon cross section and including a correction for Pauli blocking. Global fits to the proton-nucleus elastic scattering data yields a mean free path of 7.1 fm for protons of energy 175 MeV, but gave results larger at the conjugate angle by 20-60% and smaller at 72.9{degree} by 10-50%. The author concludes that the proton mean path in nuclear matter is less than that obtained from phenomenological optical model analyses but longer than that from {lambda} = 1/{rho}{sigma} corrected for Pauli Blocking.

• Research Organization: Northwestern Univ., Evanston, IL (United States)
• OSTI ID: 5224391
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27 TARGET
BARYONS
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
COMPARATIVE EVALUATIONS
CROSS SECTIONS
DATA
DIRECT REACTIONS
ELASTIC SCATTERING
ELECTRON REACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
EVALUATION
FERMIONS
HADRONS
INCLUSIVE INTERACTIONS
INFORMATION
INTERACTIONS
KNOCK-OUT REACTIONS
LEPTON REACTIONS
MEAN FREE PATH
MEV RANGE
MEV RANGE 100-1000
NICKEL 58 TARGET
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUCLEONS
OPTICAL MODELS
PARTICLE INTERACTIONS
PROTONS
QUASI-ELASTIC SCATTERING
QUASI-FREE REACTIONS
SCATTERING
TANTALUM 181 TARGET
TARGETS
YIELDS