Cross-sections for deuteron photo-disintegration from 139 to 832 MeV

Dougan, Peter; Ramsay, V.; Stiefler, W.

doi:10.1007/bf01414594

Cited by 59 publications

(13 citation statements)

References 32 publications

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“…Interestingly, at 90 and 114 Lee's results fall less slowly than the data, while at the furthest backward angle, the theoretical cross sections fall more rapidly. Lee [29] [26], crosses from Ref. [27], diamonds from Ref.…”

Section: Of Resultsmentioning

confidence: 99%

Two-body disintegration of the deuteron with 0.8–1.8 GeV photons

et al. 1993

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The differential cross section for the reaction H(p, p)n has been measured at several center-ofmass angles ranging from 50 to 143 for photon energies between 0.8 and 1.8 GeV. The experiment was performed at the SLAC-NPAS facility with the use of the 1.6 GeV/c spectrometer to detect the high energy protons produced by a bremsstrahlung beam directed at a liquid deuterium target.Contributions from concurrent disintegration by the residual electron beam were determined by measuring the proton yield without the Cu photon radiator. At angles not very far from 90', the energy dependence of the cross sections is consistent with predictions of scaling using counting rules for consitituent quarks. At least one theoretical calculation based on a meson-baryon picture of the reaction is able to reproduce the magnitude and energy dependence of the 90 cross section. The angular distribution exhibits a large enhancement at backward angles at the higher energies.PACS number(s): 25.20. Lj, 24.85. +p, 12.38. Qk, 25.10.+s t Permanent address:

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Section: Of Resultsmentioning

confidence: 99%

Two-body disintegration of the deuteron with 0.8–1.8 GeV photons

et al. 1993

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“…Three lower energy data points were taken during E96-003. [2,3,22]. The solid line is the QGS calculation [10].…”

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confidence: 99%

“…These results, u cm 53 ± at E g 2.0 GeV, u cm 37 ± and 53 ± at E g 2.5 GeV, overlapped both the JLab E89-012 and SLAC NE17 data and agree quite well with the previous cross section measurements near these energies and angles. Also shown are results from Jefferson Lab experiment E89-012 [4] and data from previous experiments [2,3,22].…”

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confidence: 99%

Measurement of the High Energy Two-Body Deuteron Photodisintegration Differential Cross Section

Schulte¹,

Ahmidouch²,

Armstrong³

et al. 2001

Phys. Rev. Lett.

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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 straight theta(cm) = 37 degrees are consistent with the constituent counting rules for E(gamma) greater, similar 4 GeV, while those at 70 degrees are consistent with the constituent counting rules for E(gamma) greater, similar 1.5 GeV.

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“…This work is supported in part by the research grants from the U.S. Department of Energy and the U.S. National Science Foundation. [18] are shown as crosses. The solid line is the meson-exchange model calculation of Lee [9].…”

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confidence: 99%

Measurements of Deuteron Photodisintegration up to 4.0 GeV

Bochna¹,

Terburg²,

Abbott³

et al. 1998

Phys. Rev. Lett.

101

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The first measurements of the differential cross section for the d͑g, p͒n reaction up to 4.0 GeV were performed at the Continuous Electron Beam Accelerator Facility (CEBAF) at Thomas Jefferson Laboratory. We report the cross sections at the proton center-of-mass angles of 36 ± , 52 ± , 69 ± , and 89 ± . These results are in reasonable agreement with previous measurements at lower energy. The 89 ± and 69 ± data show constituent-counting-rule behavior up to 4.0 GeV photon energy. The 52 ± and 36 ± data disagree with the counting-rule behavior. The quantum chromodynamics (QCD) model of nuclear reactions involving reduced amplitudes disagrees with the present data. To reconcile low energy and high energy descriptions of hadronic matter, nuclear physics must determine when it is justified to make a transition from meson-nucleon degrees of freedom to quark-gluon degrees of freedom in the description of a nuclear reaction. The QCD content of nuclei was studied first by Brodsky and Chertok [1]. A possible signature for this transition is that the reaction cross section begins to scale at some incident energy. If scaling were indeed observed, characterization of the approach to scaling would be essential to understand how the dynamics are simplified. High energy twobody photodisintegration of the deuteron ͑gd ! pn͒ is 4576 0031-9007͞98͞81(21)͞4576(4)$15.00

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Cross-sections for deuteron photo-disintegration from 139 to 832 MeV

Cited by 59 publications

References 32 publications

Two-body disintegration of the deuteron with 0.8–1.8 GeV photons

Two-body disintegration of the deuteron with 0.8–1.8 GeV photons

Measurement of the High Energy Two-Body Deuteron Photodisintegration Differential Cross Section

Measurements of Deuteron Photodisintegration up to 4.0 GeV

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