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Title: Extraction of the neutron magnetic form factor from quasielastic {sup 3}He-vector(e-vector,e{sup '}) at Q{sup 2}=0.1-0.6 (GeV/c){sup 2}

Abstract

We have measured the transverse asymmetry A{sub T{sup '}} in the quasielastic {sup 3}He-vector(e-vector,e{sup '}) process with high precision at Q{sup 2} values from 0.1 to 0.6 (GeV/c){sup 2}. The neutron magnetic form factor G{sub M}{sup n} was extracted at Q{sup 2} values of 0.1 and 0.2 (GeV/c){sup 2} using a nonrelativistic Faddeev calculation which includes both final-state interactions (FSI) and meson-exchange currents (MEC). Theoretical uncertainties due to the FSI and MEC effects were constrained with a precision measurement of the spin-dependent asymmetry in the threshold region of {sup 3}He-vector(e-vector,e{sup '}). We also extracted the neutron magnetic form factor G{sub M}{sup n} at Q{sup 2} values of 0.3 to 0.6 (GeV/c){sup 2} based on plane wave impulse approximation calculations.

Authors:
; ; ; ;  [1]; ; ; ; ; ; ;  [2]; ; ; ; ;  [3]; ; ;  [4]
  1. Kent State University, Kent, Ohio 44242 (United States)
  2. Temple University, Philadelphia, Pennsylvania 19122 (United States)
  3. College of William and Mary, Williamsburg, Virginia 23187 (United States)
  4. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States) (and others)
Publication Date:
OSTI Identifier:
20995112
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.75.034003; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ASYMMETRY; BOSON-EXCHANGE MODELS; ELECTRONS; EXTRACTION; FINAL-STATE INTERACTIONS; GEV RANGE 01-10; HELIUM 3; IMPULSE APPROXIMATION; MAGNETIC FORMING; NEUTRONS; VECTORS

Citation Formats

Anderson, B., Petratos, G. G., Prout, D., Suleiman, R., Watson, J., Auberbach, L., Choi, Seonho, Incerti, S., Lakuriqi, E., Meziani, Z.-E., Schnee, M., Slifer, K., Averett, T., Djawotho, P., Finn, J. M., Jones, M., Kramer, K., Bertozzi, W., Black, T., and Chai, Z. W. Extraction of the neutron magnetic form factor from quasielastic {sup 3}He-vector(e-vector,e{sup '}) at Q{sup 2}=0.1-0.6 (GeV/c){sup 2}. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.034003.
Anderson, B., Petratos, G. G., Prout, D., Suleiman, R., Watson, J., Auberbach, L., Choi, Seonho, Incerti, S., Lakuriqi, E., Meziani, Z.-E., Schnee, M., Slifer, K., Averett, T., Djawotho, P., Finn, J. M., Jones, M., Kramer, K., Bertozzi, W., Black, T., & Chai, Z. W. Extraction of the neutron magnetic form factor from quasielastic {sup 3}He-vector(e-vector,e{sup '}) at Q{sup 2}=0.1-0.6 (GeV/c){sup 2}. United States. doi:10.1103/PHYSREVC.75.034003.
Anderson, B., Petratos, G. G., Prout, D., Suleiman, R., Watson, J., Auberbach, L., Choi, Seonho, Incerti, S., Lakuriqi, E., Meziani, Z.-E., Schnee, M., Slifer, K., Averett, T., Djawotho, P., Finn, J. M., Jones, M., Kramer, K., Bertozzi, W., Black, T., and Chai, Z. W. 2007. "Extraction of the neutron magnetic form factor from quasielastic {sup 3}He-vector(e-vector,e{sup '}) at Q{sup 2}=0.1-0.6 (GeV/c){sup 2}". United States. doi:10.1103/PHYSREVC.75.034003.
@article{osti_20995112,
title = {Extraction of the neutron magnetic form factor from quasielastic {sup 3}He-vector(e-vector,e{sup '}) at Q{sup 2}=0.1-0.6 (GeV/c){sup 2}},
author = {Anderson, B. and Petratos, G. G. and Prout, D. and Suleiman, R. and Watson, J. and Auberbach, L. and Choi, Seonho and Incerti, S. and Lakuriqi, E. and Meziani, Z.-E. and Schnee, M. and Slifer, K. and Averett, T. and Djawotho, P. and Finn, J. M. and Jones, M. and Kramer, K. and Bertozzi, W. and Black, T. and Chai, Z. W.},
abstractNote = {We have measured the transverse asymmetry A{sub T{sup '}} in the quasielastic {sup 3}He-vector(e-vector,e{sup '}) process with high precision at Q{sup 2} values from 0.1 to 0.6 (GeV/c){sup 2}. The neutron magnetic form factor G{sub M}{sup n} was extracted at Q{sup 2} values of 0.1 and 0.2 (GeV/c){sup 2} using a nonrelativistic Faddeev calculation which includes both final-state interactions (FSI) and meson-exchange currents (MEC). Theoretical uncertainties due to the FSI and MEC effects were constrained with a precision measurement of the spin-dependent asymmetry in the threshold region of {sup 3}He-vector(e-vector,e{sup '}). We also extracted the neutron magnetic form factor G{sub M}{sup n} at Q{sup 2} values of 0.3 to 0.6 (GeV/c){sup 2} based on plane wave impulse approximation calculations.},
doi = {10.1103/PHYSREVC.75.034003},
journal = {Physical Review. C, Nuclear Physics},
number = 3,
volume = 75,
place = {United States},
year = 2007,
month = 3
}
  • We report a measurement of the asymmetry in spin-dependent quasielastic scattering of longitudinally polarized electrons from a polarized {sup 3}He target. The neutron magnetic form factor {ital G}{sup {ital n}}{sub {ital M}} has been extracted from the measured asymmetry based on recent PWIA calculations using spin-dependent spectral functions. This work represents the first measurement of {ital G}{sup {ital n}}{sub {ital M}} using spin-dependent electron scattering. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
  • We report a measurement of the asymmetry in spin-dependent quasielastic scattering of longitudinally polarized electrons from a polarized {sup 3}He target. The neutron magnetic form factor {ital G}{sup {ital n}}{sub {ital M}} has been extracted from the measured asymmetry based on recent PWIA calculations using spin-dependent spectral functions. This experiment represents the first measurement of the neutron magnetic form factor using spin-dependent electron scattering. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
  • We report a measurement of the asymmetry in spin-dependent quasielastic scattering of longitudinally polarized electrons from a polarized [sup 3]He target. The neutron magnetic form factor [ital G][sup [ital n]][sub [ital M]] has been extracted from the measured asymmetry based on recent PWIA calculations using spin-dependent spectral functions. Our determination of [ital G][sup [ital n]][sub [ital M]] at [ital Q][sup 2]=0.19 (GeV/[ital c])[sup 2] agrees with the dipole parametrization. This experiment represents the first measurement of the neutron magnetic form factor using spin-dependent electron scattering.
  • We analyze cross sections for quasielastic inclusive scattering of electrons on nuclei and show that the observed isolated peaks for relatively low Q{sup 2} are unique for the lightest targets. Focusing, in particular, on D and {sup 4}He, we investigate in two ways to what measure the above peaks can be allocated to nucleon-elastic processes. We first compute approximate upper limits for the nucleon-inelastic background in the quasielastic region due to inclusive {delta} excitation, and find those to be small. Far more precise is a semiphenomenological approach, where the dominance of nucleon-elastic processes is translated into a set of stringentmore » requirements. We show that those are very well fulfilled for recent D data, and to a somewhat lesser extent for older D and {sup 4}He data. With knowledge of G{sub E,M}{sup p} and information on G{sub E}{sup n}, we then extract G{sub M}{sup n} and find agreement with values obtained by alternative methods. We discuss the sensitivity of the extraction method and mention future applications.« less
  • We have measured the transverse asymmetry A{sub T{prime}} in {rvec {sup 3}He}({rvec e},e{prime}) quasielastic scattering in Hall A at Jefferson Laboratory with high precision for Q{sup 2} values from 0.1 to 0.6 (GeV/c){sup 2} . The neutron magnetic form factor G{sup n}{sub M} was extracted based on Faddeev calculations for Q{sup 2}=0.1 and 0.2 (GeV/c){sup 2} with an experimental uncertainty of less than 2% .