Hard Photodisintegration of a Proton Pair

arxiv: 0908.2968 · v2 · submitted 2009-08-20 · ⚛️ nucl-ex · hep-ex

Hard Photodisintegration of a Proton Pair

I. Pomerantz , N. Bubis , K. Allada , A. Beck , S. Beck , B.L. Berman , W. Boeglin , A. Camsonne

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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. Jiang A.T. Katramatou E. Khrosinkova B. 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

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keywords photodisintegrationcrosspairscalingsectiondeuteronenergiesenergy

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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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Hard Photodisintegration of a Proton Pair

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