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

Abstract

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 languageEnglish
Pages (from-to)106-109
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume684
Issue number2-3
DOIs
StatePublished - 8 Feb 2010

Funding

FundersFunder number
US-Israeli Bi-National Scientific Foundation
National Science Foundation
U.S. Department of EnergyDE-AC05-06OR23177
Thomas Jefferson National Accelerator Facility
Israel Science Foundation

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