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Published November 28, 1988 | Published
Journal Article Open

Measurement of the Differential Cross Section for the reaction 2H(γ,p)n at High Photon Energies and θc.m.=90°


We have measured the differential cross section for two-body deuteron photodisintegration at θc.m.=90° and for photon energies between 0.8 and 1.6 GeV. At energies above ≃ 1.2 GeV, the data appear to obey a simple scaling law predicted by constituent-counting rules assuming parton degrees of freedom for the deuteron and nucleons. Agreement with model calculations based on meson exchange or "reduced nuclear amplitudes" is discussed.

Additional Information

© 1988 The American Physical Society. Received 8 June 1988. We wish to thank Dr. B. Mecking for his work in identifying possible sources of background prior to the experiment. We are grateful to the SLAC cryogenics target group, especially J. Mark and J. Nicol, and the end station A support staff, in particular R. Eisele. This work was supported by the U.S. Department of Energy, Nuclear Physics Division, under Contracts No. W-31-109-ENG-38, No. DE-A505-76-ERO-4043, No. DE-AC02-76-ERO-3069, and No. DE-FG03-88-ERO-4039; and by the National Science Foundation under Grants No. PHY85-05682, No. PHY86-08247-01, and No. PHY87-15050. One of us (B.W.F.) acknowledges support from the Alfred P. Sloan Foundation.

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