Author: Brendan David Fox
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Languages : en
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We have measured the absolute $rmsp2H(gamma,p)n$ angular distribution using the Illinois LASA detector at the Saskatchewan Accelerator Laboratory's tagged photon facility. Using 40 to 90 MeV photons, we aimed to measure the differential cross section with a statistical precision of typically 5% in angular bins of $3spcirc$ and energy bins of 2 MeV. Although our measurement achieved this goal, the contribution of systematic errors was larger than anticipated and thus compromised the utility of this result. Without these systematic errors, this measurement (when combined with the world data set) would have provided an extensive experimental data set with an accuracy which was better than the scatter between the various theoretical calculations for the interaction. Refinements to the treatment of the interaction would then have been testable. In particular, because the shape of the angular distribution in this energy regime is sensitive to meson exchange currents, it would have been possible to investigate the methods for incorporating these currents into calculations.

Author: P. T. Debevec
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Languages : en
Pages : 0

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Author: Troy Soos
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Languages : en
Pages : 170

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Author: Brendan David Fox
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Category :
Languages : en
Pages : 398

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Author: Elaine Carol Schulte
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Category :
Languages : en
Pages : 266

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Author: Thih-Yuen Tung
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Languages : en
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Languages : en
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New measurements of the high energy deuteron photodisintegration differential cross section were made at the Thomas Jefferson National Accelerator Facility in Newport News, Virginia. Two experiments were performed. Experiment E96-003 was performed in experimental Hall C. The measurements were designed to extend the highest energy differential cross section values to 5.5 GeV incident photon energy at forward angles. This builds upon previous high energy measurements in which scaling consistent with the pQCD constituent counting rules was observed at 90 degrees and 70 degrees in the center of mass. From the new measurements, a threshold for the onset of constituent counting rule scaling seems present at transverse momentum approximately 1.3 GeV/c. The second experiment, E99-008, was performed in experimental Hall A. The measurements were designed to explore the angular distribution of the differential cross section at constant energy. The measurements were made symmetric about 90 degrees.

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Languages : en
Pages : 4

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The first measurements of the d(gamma, p)n differential cross section at forward angles and photon energies above 4 GeV were performed at the Thomas Jefferson National Accelerator Facility (JLab). The results indicate evidence of an angular dependent scaling threshold. Results at theta{sub cm} = 37{sup o} are consistent with the constituent counting rules for E{sub gamma}H" 4 GeV, while those at 70{sup o} are consistent with the constituent counting rules for E{sub gamma} H" 1.5 GeV.

Author: Bjorn H. Wiik
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Category :
Languages : en
Pages : 12

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The differential cross-section for the photodisintegration of the deuteron was measured at laboratory photon energies of 222, 254, 302, 342 MeV in CM angle steps of 10 deg between 20 deg CM and 160 deg CM. (Author).

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Languages : en
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