Hard Photodisintegration of a Proton Pair
Abstract
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.
Keywords
Cite
@article{arxiv.0908.2968,
title = {Hard Photodisintegration of a Proton Pair},
author = {I. Pomerantz and N. Bubis and K. Allada and A. Beck and S. Beck and B. L. Berman and W. Boeglin and A. Camsonne and M. Canan and K. Chirapatpimol and E. Cisbani and F. Cusanno and C. W. de Jager and C. Dutta and F. Garibaldi and O. Geagla and R. Gilman and J. Glister and D. W. Higinbotham and X. Jiang and A. T. Katramatou and E. Khrosinkova and B. Lee and J. J. LeRose and R. Lindgren and E. McCullough and D. Meekins and R. Michaels and B. Moffit and G. G. Petratos and E. Piasetzky and X. Qian and Y. Qiang and I. Rodriguez and G. Ron and A. Saha and A. J. Sarty and B. Sawatzky and E. Schulte and R. Shneor and N. Sparveris and R. Subedi and S. Strauch and V. Sulkosky and Y. Wang and B. Wojtsekhowski and X. Yan and H. Yao and X. Zhan and X. Zheng},
journal= {arXiv preprint arXiv:0908.2968},
year = {2010}
}
Comments
7 pages, 3 figures, for submission to Phys. Lett. B