Relativistic treatment of spin-transfer observables in quasielastic ([ital [rvec p]],[ital [rvec n]]) scattering

Journal Article · Tue Nov 01 04:00:00 EST 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.50.2540· OSTI ID:6904938

Horowitz, C J ^[1]; Piekarewicz, J ^[2]

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1. Nuclear Theory Center and Department of Physics, Indiana University, Bloomington, Indiana 47505 (United States)
2. Supercomputer Computations Research Institute, Florida State University, Tallahassee, Florida 32306 (United States)

We calculate all spin-transfer observables for the quasielastic ([ital [rvec p]],[ital [rvec n]]) reaction in a relativistic plane-wave impulse approximation. The nuclear structure information is contained in a large set of nuclear response functions that are computed in nuclear matter using a relativistic random-phase approximation to the Walecka model. A reduced value of the nucleon mass in the medium induces important dynamical changes in the residual isovector interaction relative to its nonrelativistic counterpart. As a result, good agreement is found for all spin observables---including the spin-longitudinal to spin-transverse ratio---when compared to the original ([ital q]=1.72 fm[sup [minus]1]) NTOF (neutron time-of-flight facility) experiment. In contrast, the spin-longitudinal to spin-transverse ratio is underpredicted at [ital q]=1.2 fm[sup [minus]1] and overpredicted at [ital q]=2.5 fm[sup [minus]1]. We comment on the role of distortions as a possible solution to this discrepancy.

• DOE Contract Number: FG05-85ER25000; FG05-92ER40750
• OSTI ID: 6904938
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 50:5; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

662340 -- Hadron Interactions-- (1992-)
663120 -- Nuclear Structure Models & Methods-- (1992-)
663300 -- Nuclear Reactions & Scattering
General-- (1992-)
663430* -- Nucleon-Induced Reactions & Scattering-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BARYON-BARYON INTERACTIONS
BARYONS
BEAMS
BOSONS
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
DIRECT REACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FUNCTIONS
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
HADRONS
IMPULSE APPROXIMATION
INTERACTIONS
MATHEMATICAL MODELS
MESONS
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PIONS
POLARIZATION
POLARIZED BEAMS
PROTON REACTIONS
PSEUDOSCALAR MESONS
QUASI-ELASTIC SCATTERING
QUASI-FREE REACTIONS
RANDOM PHASE APPROXIMATION
RELATIVISTIC RANGE
RESPONSE FUNCTIONS
SCATTERING
SPIN FLIP
WALECKA MODEL