Physics Letters B
We present a Study of high energy photodisintegration of proton-pairs through the gamma + (3)He -> p + p + n channel. Photon energies, E(gamma), from 0.8 to 4.7 GeV were used in kinematics corresponding to a proton pair with high relative momentum and a neutron nearly at rest. The s(-11) scaling of the cross section, as predicted by the constituent counting rule for two nucleon photodisintegration, was observed for the first time. The onset of the scaling is at a higher energy and the cross section is significantly lower than for deuteron (pn pair) photoclisintegration. For E(gamma) below the scaling region, the scaled cross section was found to present a strong energy-dependent structure not observed in deuteron photodisintegration. (C) 2010 Elsevier B.V. All rights reserved.
Pomerantz, I., Bubis, N., Allada, K., Beck, A., Beck, S., Berman, B. L., ... & Cisbani, E. (2010). Hard photodisintegration of a proton pair. Physics Letters B, 684(2-3), 106-109.