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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:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
903398
Report Number(s):
JLAB-PHY-07-629; DOE/ER/40150-4281
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US0703260
DOE Contract Number:
AC05-84ER40150
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. Lett.; Journal Volume: 98
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BENCHMARKS; DEUTERONS; ISOVECTORS; PHOTONS; PHOTONUCLEAR REACTIONS; POLARIZATION; QUANTUM CHROMODYNAMICS

Citation Formats

X. Jiang, J. Arrington, F. Benmokhtar, A. Camsonne, J. P. Chen, S. Choi, E. Chudakov, F. Cusanno, A. Deur, D. Dutta, F. Garibaldi, D. Gaskell, O. Gayou, R. Gilman, C. Glashauser, D. Hamilton, O. Hansen, D. W. Higinbotham, R. J. Holt, C. W. de Jager, M. K. Jones, L. J. Kaufman, E. R. Kinney, K. Kramer, L. Lagamba, R. de Leo, J. Lerose, D. Lhuillier, R. Lindgren, N. Liyanage, K. McCormick, Z.-E. Meziani, R. Michaels, B. Moffit, P. Monaghan, S. Nanda, K. D. Paschke, C. F. Perdrisat, V. Punjabi, I. A. Qattan, R. D. Ransome, P. E. Reimer, B. Reitz, A. Saha, E. C. Schulte, R. Sheyor, K. Slifer, P. Solvignon, V. Sulkosky, G. M. Urciuoli, E. Voutier, K. Wang, K. Wijesooriya, B. Wojtsekhowski, and and L. Zhu. Recoil-Proton Polarization in High-Energy Deuteron Photodisintegration with Circularly Polarized Photons. United States: N. p., 2007. Web. doi:10.1103/PhysRevLett.98.182302.
X. Jiang, J. Arrington, F. Benmokhtar, A. Camsonne, J. P. Chen, S. Choi, E. Chudakov, F. Cusanno, A. Deur, D. Dutta, F. Garibaldi, D. Gaskell, O. Gayou, R. Gilman, C. Glashauser, D. Hamilton, O. Hansen, D. W. Higinbotham, R. J. Holt, C. W. de Jager, M. K. Jones, L. J. Kaufman, E. R. Kinney, K. Kramer, L. Lagamba, R. de Leo, J. Lerose, D. Lhuillier, R. Lindgren, N. Liyanage, K. McCormick, Z.-E. Meziani, R. Michaels, B. Moffit, P. Monaghan, S. Nanda, K. D. Paschke, C. F. Perdrisat, V. Punjabi, I. A. Qattan, R. D. Ransome, P. E. Reimer, B. Reitz, A. Saha, E. C. Schulte, R. Sheyor, K. Slifer, P. Solvignon, V. Sulkosky, G. M. Urciuoli, E. Voutier, K. Wang, K. Wijesooriya, B. Wojtsekhowski, & and L. Zhu. Recoil-Proton Polarization in High-Energy Deuteron Photodisintegration with Circularly Polarized Photons. United States. doi:10.1103/PhysRevLett.98.182302.
X. Jiang, J. Arrington, F. Benmokhtar, A. Camsonne, J. P. Chen, S. Choi, E. Chudakov, F. Cusanno, A. Deur, D. Dutta, F. Garibaldi, D. Gaskell, O. Gayou, R. Gilman, C. Glashauser, D. Hamilton, O. Hansen, D. W. Higinbotham, R. J. Holt, C. W. de Jager, M. K. Jones, L. J. Kaufman, E. R. Kinney, K. Kramer, L. Lagamba, R. de Leo, J. Lerose, D. Lhuillier, R. Lindgren, N. Liyanage, K. McCormick, Z.-E. Meziani, R. Michaels, B. Moffit, P. Monaghan, S. Nanda, K. D. Paschke, C. F. Perdrisat, V. Punjabi, I. A. Qattan, R. D. Ransome, P. E. Reimer, B. Reitz, A. Saha, E. C. Schulte, R. Sheyor, K. Slifer, P. Solvignon, V. Sulkosky, G. M. Urciuoli, E. Voutier, K. Wang, K. Wijesooriya, B. Wojtsekhowski, and and L. Zhu. Tue . "Recoil-Proton Polarization in High-Energy Deuteron Photodisintegration with Circularly Polarized Photons". United States. doi:10.1103/PhysRevLett.98.182302. https://www.osti.gov/servlets/purl/903398.
@article{osti_903398,
title = {Recoil-Proton Polarization in High-Energy Deuteron Photodisintegration with Circularly Polarized Photons},
author = {X. Jiang and J. Arrington and F. Benmokhtar and A. Camsonne and J. P. Chen and S. Choi and E. Chudakov and F. Cusanno and A. Deur and D. Dutta and F. Garibaldi and D. Gaskell and O. Gayou and R. Gilman and C. Glashauser and D. Hamilton and O. Hansen and D. W. Higinbotham and R. J. Holt and C. W. de Jager and M. K. Jones and L. J. Kaufman and E. R. Kinney and K. Kramer and L. Lagamba and R. de Leo and J. Lerose and D. Lhuillier and R. Lindgren and N. Liyanage and K. McCormick and Z.-E. Meziani and R. Michaels and B. Moffit and P. Monaghan and S. Nanda and K. D. Paschke and C. F. Perdrisat and V. Punjabi and I. A. Qattan and R. D. Ransome and P. E. Reimer and B. Reitz and A. Saha and E. C. Schulte and R. Sheyor and K. Slifer and P. Solvignon and V. Sulkosky and G. M. Urciuoli and E. Voutier and K. Wang and K. Wijesooriya and B. Wojtsekhowski and and L. Zhu},
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 = {Phys. Rev. Lett.},
number = ,
volume = 98,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 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.