Momentum space approach to microscopic effects in elastic proton scattering

Technical Report · Fri Jun 01 04:00:00 EDT 1984

OSTI ID:6539285

Picklesimer, A; Tandy, P C; Thaler, R M; Wolfe, D H

The microscopic non-relativistic first-order optical potential for proton-nucleus scattering is studied in some detail. Momentum-space calculations have been performed for a number of different target nucli at proton energies above approx.100 MeV and these microscopic predictions are compared with experimental cross section, analyzing power, and spin-rotation function data. The input to these calculations consists of the free on-shell nucleon-nucleon t-matrix, its non-local and off-shell structure, the treatment of the full-folding integral, and target densities obtained from electron scattering. Off-shell and non-local effects, as well as various factorization approximations, are studied. The sensitivity to uncertainies in the off-shell extension of the t-matrix, within the context of the Love-Franey model, is explicitly displayed. Similarly, uncertainties due to non-localities and incomplete knowledge of nuclear densities are shown. Explicit calculations using the t-matrix of Love and Franey indicate that these effects play significant roles only for relatively large angles (THETA less than or equal to 60/sup 0/) and/or lower energies (approx.150 MeV). These studies reinforce the conclusion that the lack of agreement between such first-order predictions and the data for spin observable at small angles arises from a physical effect not included in the non-relativistic first-order theory, rather than from any uncertainty in the calculation or in its input. 31 references.

• Research Organization: Maryland Univ., College Park (USA). Dept. of Physics and Astronomy
• DOE Contract Number: AS05-76ER05126
• OSTI ID: 6539285
• Report Number(s): DOE/ER/05126-232; ORO-5126-232; ON: DE85001613
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
ANGULAR MOMENTUM
BARYON REACTIONS
CALCIUM 40 TARGET
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ENERGY RANGE
FACTORIZATION
HADRON REACTIONS
IMPULSE APPROXIMATION
MATRICES
MEV RANGE
MEV RANGE 100-1000
MOMENTUM TRANSFER
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUCLEON REACTIONS
OPTICAL MODELS
OXYGEN 16 TARGET
PARTICLE PROPERTIES
POTENTIALS
PROTON REACTIONS
S MATRIX
SCATTERING
SPIN
TARGETS