Comparison of Dirac and Schroedinger descriptions of spin observables for proton-nucleus elastic scattering at 650 and 800 MeV

Journal Article · Wed Aug 01 04:00:00 EDT 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.42.659· OSTI ID:6479330

Coker, W R; Ray, L ^[1]

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1. Department of Physics, The University of Texas at Austin, Austin, Texas 78712 (USA)

We compute the analyzing power, {ital A}{sub {ital y}}, and spin rotation, {ital Q}, for proton elastic scattering at 650 and 800 MeV from target nuclei {sup 16}O, {sup 40}Ca, and {sup 208}Pb, using both nonrelativistic multiple-scattering theory and a relativistic impulse approximation model. We show that the nonrelativistic theory, based on the Schroedinger equation with relativistic kinematics, and the relativistic model, based on the Dirac equation, provide very similar and equally good descriptions of these spin observables when electromagnetic spin-orbit contributions are included in both approaches. The nonrelativistic model calculations include contributions from nuclear medium effects (Pauli blocking and binding energy corrections) and also target nucleon two-body correlations. Medium effects and correlations are not expected to be significant in the relativistic model based on the Dirac equation, and were not included.

• OSTI ID: 6479330
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 42:2; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
ANGULAR MOMENTUM
BARYON REACTIONS
BINDING ENERGY
CALCIUM 40 TARGET
CHARGED-PARTICLE REACTIONS
COUPLING
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DIFFERENTIAL EQUATIONS
DIRAC EQUATION
ELASTIC SCATTERING
ENERGY
ENERGY RANGE
EQUATIONS
FIELD THEORIES
GENERAL RELATIVITY THEORY
HADRON REACTIONS
IMPULSE APPROXIMATION
INTERMEDIATE COUPLING
L-S COUPLING
LEAD 208 TARGET
MEV RANGE
MEV RANGE 100-1000
MULTIPLE SCATTERING
NUCLEAR REACTIONS
NUCLEON REACTIONS
OXYGEN 16 TARGET
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE PROPERTIES
PROTON REACTIONS
RELATIVITY THEORY
SCATTERING
SCHROEDINGER EQUATION
SPIN
TARGETS
WAVE EQUATIONS