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Title: Recoil-Proton Polarization in High-Energy Deuteron Photodisintegration with Circularly Polarized Photons

Abstract

We measured the angular dependence of the three recoil-proton polarization components in two-body photodisintegration of the deuteron at a photon energy of 2 GeV. These new data provide a benchmark for calculations based on quantum chromodynamics. Two of the five existing models have made predictions of polarization observables. Both explain the longitudinal polarization transfer satisfactorily. Transverse polarizations are not well described, but suggest isovector dominance.

Authors:
; ; ; ;  [1]; ; ; ; ;  [2];  [3]; ; ; ; ; ; ; ; ;  [4]
  1. Rutgers, State University of New Jersey, Piscataway, New Jersey 08854 (United States)
  2. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  3. Universite Blaise Pascal/IN2P3, F-63177 Aubiere (France)
  4. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States) (and others)
Publication Date:
OSTI Identifier:
20951334
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 18; Other Information: DOI: 10.1103/PhysRevLett.98.182302; (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; DEUTERONS; GEV RANGE 01-10; ISOVECTORS; PHOTONS; PHOTONUCLEAR REACTIONS; POLARIZATION; PROTONS; QUANTUM CHROMODYNAMICS; TWO-BODY PROBLEM

Citation Formats

Jiang, X., Benmokhtar, F., Glashauser, C., McCormick, K., Ransome, R. D., Arrington, J., Holt, R. J., Reimer, P. E., Schulte, E. C., Wijesooriya, K., Camsonne, A., Chen, J. P., Chudakov, E., Gaskell, D., Hansen, O., Higinbotham, D. W., Jager, C. W. de, Jones, M. K., Lerose, J., and Michaels, R. Recoil-Proton Polarization in High-Energy Deuteron Photodisintegration with Circularly Polarized Photons. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.182302.
Jiang, X., Benmokhtar, F., Glashauser, C., McCormick, K., Ransome, R. D., Arrington, J., Holt, R. J., Reimer, P. E., Schulte, E. C., Wijesooriya, K., Camsonne, A., Chen, J. P., Chudakov, E., Gaskell, D., Hansen, O., Higinbotham, D. W., Jager, C. W. de, Jones, M. K., Lerose, J., & Michaels, R. Recoil-Proton Polarization in High-Energy Deuteron Photodisintegration with Circularly Polarized Photons. United States. doi:10.1103/PHYSREVLETT.98.182302.
Jiang, X., Benmokhtar, F., Glashauser, C., McCormick, K., Ransome, R. D., Arrington, J., Holt, R. J., Reimer, P. E., Schulte, E. C., Wijesooriya, K., Camsonne, A., Chen, J. P., Chudakov, E., Gaskell, D., Hansen, O., Higinbotham, D. W., Jager, C. W. de, Jones, M. K., Lerose, J., and Michaels, R. Fri . "Recoil-Proton Polarization in High-Energy Deuteron Photodisintegration with Circularly Polarized Photons". United States. doi:10.1103/PHYSREVLETT.98.182302.
@article{osti_20951334,
title = {Recoil-Proton Polarization in High-Energy Deuteron Photodisintegration with Circularly Polarized Photons},
author = {Jiang, X. and Benmokhtar, F. and Glashauser, C. and McCormick, K. and Ransome, R. D. and Arrington, J. and Holt, R. J. and Reimer, P. E. and Schulte, E. C. and Wijesooriya, K. and Camsonne, A. and Chen, J. P. and Chudakov, E. and Gaskell, D. and Hansen, O. and Higinbotham, D. W. and Jager, C. W. de and Jones, M. K. and Lerose, J. and Michaels, R.},
abstractNote = {We measured the angular dependence of the three recoil-proton polarization components in two-body photodisintegration of the deuteron at a photon energy of 2 GeV. These new data provide a benchmark for calculations based on quantum chromodynamics. Two of the five existing models have made predictions of polarization observables. Both explain the longitudinal polarization transfer satisfactorily. Transverse polarizations are not well described, but suggest isovector dominance.},
doi = {10.1103/PHYSREVLETT.98.182302},
journal = {Physical Review Letters},
number = 18,
volume = 98,
place = {United States},
year = {Fri May 04 00:00:00 EDT 2007},
month = {Fri May 04 00:00:00 EDT 2007}
}
  • We measured the angular dependence of the three recoil-proton polarization components in two-body photodisintegration of the deuteron at a photon energy of 2 GeV. These new data provide a benchmark for calculations based on quantum chromodynamics. Two of the five existing models have made predictions of polarization observables. Both explain the longitudinal polarization transfer satisfactorily. Transverse polarizations are not well described, but suggest isovector dominance.
  • We measured the angular dependence of the three recoil-proton polarization components in two-body photodisintegration of the deuteron at a photon energy of 2 GeV. These new data provide a benchmark for calculations based on quantum chromodynamics. Two of the five existing models have made predictions of polarization observables. Both explain the longitudinal polarization transfer satisfactorily. Transverse polarizations are not well described, but suggest isovector dominance.
  • The proton polarization in deuteron photodisintegration by linearly polarized and unpolarized photons at theta = 90/sup 0/ (theta is the angle between the momenta of the proton and photon in the c.m.s.) has been measured in the photon-energy range 300--500 MeV. This permitted us to obtain under similar experimental conditions the observable polarization parameters: P-italic/sub Y-italic/: the proton polarization in the unpolarized beam; ..sigma..: the asymmetry of the cross section, and (for the first time) T-italic/sub 1/: the asymmetry of the proton polarization. Asymmetries arise from linear polarization of the photon. Comparison of the obtained polarization parameters with calculations accordingmore » to the gauge-invariant pole model (GIPM), which takes into account isobar-exchange currents and includes various numbers of dibaryon resonances (/sup 1/D/sub 2/, /sup 3/F/sub 3/, /sup 1/S/sub 0/, and /sup 3/P/sub 1/) with isospin 1, has shown that the best agreement is observed for the model which includes four dibaryons.« less
  • We describe the experimental methods and the results of measurements of the asymmetry of the cross section of the eld pn reaction induced by linearly polarized photons over the energy range E/sub el/ = 0.4 to 0.8 GeV and proton angles in the c.m. system theta* = 45 to 95. Experiments were conducted on a two-arm spectrometer installation. The results obtained do not agree either with calculations within the framework of phenomenological models, or with predictions of a partial-wave analysis that includes the contribution of dibaryon resonances.
  • The polarization of the recoil protons at the angle theta(/sub p/ = 90/sup 0/ has been measured in the photodisintegration of the deuteron by linearly polarized 400- and 500-MeV ..gamma.. rays. For the first time, all of the following observables have been determined under identical experimental conditions: ..sigma.., the asymmetry of the cross sections; P/sub y/, the polarization of the recoil proton; and T/sub 1/, the asymmetry of the nucleon polarization for the case of linearly polarized ..gamma.. rays.