Hard photodisintegration of a proton pair

I. Pomerantz, N. Bubis, K. Allada, A. Beck, S. Beck, B. L. Berman, W. Boeglin, A. Camsonne, M. Canan, K. Chirapatpimol, E. Cisbani, F. Cusanno, C. W. de Jager, C. Dutta, F. Garibaldi, O. Geagla, R. Gilman, J. Glister, D. W. Higinbotham*, X. JiangA. T. Katramatou, E. Khrosinkova, B. W. Lee, J. J. LeRose, R. Lindgren, E. McCullough, D. Meekins, R. Michaels, B. Moffit, G. G. Petratos, E. Piasetzky, X. Qian, Y. Qiang, I. Rodriguez, G. Ron, A. Saha, A. J. Sarty, B. Sawatzky, E. Schulte, R. Shneor, N. Sparveris, R. Subedi, S. Strauch, V. Sulkosky, Y. Wang, B. Wojtsekhowski, X. Yan, H. Yao, X. Zhan, X. Zheng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


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

Original languageAmerican English
Pages (from-to)106-109
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number2-3
StatePublished - 8 Feb 2010
Externally publishedYes

Bibliographical note

Funding Information:
We thank M.M. Sargsian for initiating and escorting this study and S.J. Brodsky, L.L. Frankfurt and M. Strikman for helpful discussions. We thank the JLab physics and accelerator divisions for their support and especially the CLAS Collaboration of Hall B, for allowing us access to their data. This work was supported by the US Department of Energy , the US National Science Foundation , the Israel Science Foundation , and the US-Israeli Bi-National Scientific Foundation . Jefferson Science Associates operates the Thomas Jefferson National Accelerator Facility under DOE contract DE-AC05-06OR23177.


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