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Title: Search for Proton Medium Modifications in the 4He(e,e'p)3H Reaction

Abstract

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 4He(e,e'p)3H reaction at a Q^2 of 0.8 (GeV/c)^2 and 1.3 (GeV/c)^2 with unprecedented precision. These data complement earlier data between 0.4 and 2.6 (GeV/c)^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.

Authors:
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
917016
Report Number(s):
JLAB-PHY-07-724; DOE/OR/23177-0153; arXiv:0709.4034
TRN: US0804409
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: NuInt07, May 30-June 2, 2007, Batavio, IL
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CHARGE EXCHANGE; FINAL-STATE INTERACTIONS; FORM FACTORS; MODIFICATIONS; NUCLEONS; POLARIZATION; PROTONS

Citation Formats

S. Strauch. Search for Proton Medium Modifications in the 4He(e,e'p)3H Reaction. United States: N. p., 2007. Web.
S. Strauch. Search for Proton Medium Modifications in the 4He(e,e'p)3H Reaction. United States.
S. Strauch. Wed . "Search for Proton Medium Modifications in the 4He(e,e'p)3H Reaction". United States. doi:. https://www.osti.gov/servlets/purl/917016.
@article{osti_917016,
title = {Search for Proton Medium Modifications in the 4He(e,e'p)3H Reaction},
author = {S. Strauch},
abstractNote = {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 4He(e,e'p)3H reaction at a Q^2 of 0.8 (GeV/c)^2 and 1.3 (GeV/c)^2 with unprecedented precision. These data complement earlier data between 0.4 and 2.6 (GeV/c)^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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed May 30 00:00:00 EDT 2007},
month = {Wed May 30 00:00:00 EDT 2007}
}

Conference:
Other availability
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