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

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 ${\theta }_{\mathrm{cm}}=37\mathrm{}°$ are consistent with the constituent counting rules for $E_{\gamma }\gtrsim 4\mathrm{GeV}$, while those at $70°$ are consistent with the constituent counting rules for $E_{\gamma }\gtrsim 1.5\mathrm{GeV}$.