Medium Modifications from {sup 4}He(e-vector,e'p-vector){sup 3}H

Journal Article · Mon Oct 13 00:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3013033· OSTI ID:21251441

Malace, S; Paolone, M; Strauch, S ^[1]

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1. University of South Carolina, Columbia, South Carolina 29208 (United States)

Polarization transfer in quasi-elastic nucleon knockout is sensitive to the properties of the nucleon in the nuclear medium, including possible modification of the nucleon form factor and/or spinor. In our recently completed experiment E03-104 at Jefferson Lab we measured the proton recoil polarization in the {sup 4}He(e-vector,e'p-vector){sup 3}H reaction at a Q{sup 2} of 0.8 (GeV/c){sup 2} and 1.3 (GeV/c){sup 2} with unprecedented precision. These data complement earlier data between 0.4 and 2.6 (GeV/c){sup 2} from both Mainz and Jefferson Lab. The measured ratio of polarization-transfer coefficients differs from a fully relativistic calculation, favoring either the inclusion of a medium modification of the proton form factors predicted by a quark-meson coupling model or strong charge-exchange final-state interactions. The measured induced polarizations agree well with the fully relativistic calculation and indicate that these strong final-state interactions may not be applicable.

• OSTI ID: 21251441
• Journal Information: AIP Conference Proceedings, Vol. 1056, Issue 1; Conference: 6. international conference on perspectives in hadronic physics, Trieste (Italy), 12-16 May 2008; Other Information: DOI: 10.1063/1.3013033; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CEBAF ACCELERATOR
CHARGE EXCHANGE
DEEP INELASTIC SCATTERING
ELECTROMAGNETIC FORM FACTORS
ELECTRON BEAMS
ELECTRON REACTIONS
FINAL-STATE INTERACTIONS
HELIUM 4 TARGET
KNOCK-OUT REACTIONS
MESONS
POLARIZATION
POLARIZED BEAMS
PROTONS
QUANTUM CHROMODYNAMICS
QUARKS
RELATIVISTIC RANGE
SPIN ORIENTATION
SUM RULES
TRANSFER REACTIONS
TRITIUM