Hard Photodisintegration of a Proton Pair

Details Hard Photodisintegration of a Proton Pair Hard Photodisintegration of a Proton Pair

2009-08-20

arxiv.org/abs/0908.2968v2

Phys.Lett.B684:106-109,2010

Physics

Nuclear Physics

Nuclear Experiment

7 pages, 3 figures, for submission to Phys. Lett. B

Scientific paper

10.1016/j.physletb.2009.12.050

We present a study of high energy photodisintegration of proton-pairs through the gamma + 3He -> p+p+n channel. Photon energies 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) photodisintegration. For photon energies below the scaling region, the scaled cross section was found to present a strong energy-dependent structure not observed in deuteron photodisintegration.

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