Abstract
We present a study of high energy photodisintegration of proton-pairs through the γ+He3→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.
Highlights
We present a study of high energy photodisintegration of proton-pairs through the γ + 3He → p+ p+n channel
In an attempt to more clearly identify the underlying dynamics at play, we present in structure of the hadrons and nuclei, since they this work the first high-energy measurement of involve short distance scales
To θc.m. = 90◦ break-up of proton pairs were selected with various cuts on neutron momenformalism [20] after normalization to the deuteron data [26] yields cross sections tum
Summary
I. Pomerantza, N. Bubisa, K. Alladab, A. Beckc, S. Beckc, B. L. Bermand, W. Boegline, A. Camsonnef, M. Canang, K. Chirapatpimolh, E. Cisbanii, F. Cusannoi, C. W. de Jagerf, C. Duttab, F. Garibaldii, O. Geaglah, R. Gilmanf,j, J. Glisterk,l, D. W. Higinbothamf, X. Jiangj, A. T. Katramatoum, E. Khrosinkovam, B. W. Leen, J. J. LeRosef, R. Lindgrenh, E. McCulloughk, D. Meekins1, R. Michaelsf, B. Moffito, G. G. Petratosm, E. Piasetzkya, X. Qianp, Y. Qiangq, I. Rodrigueze, G. Ronr, A. Sahaf, A. J. Sartyk, B. Sawatzkyh,s, E. Schultej, R. Shneora, N. Sparverisq, R. Subedim, S. Straucht, V. Sulkoskyf, Y. Wangu, B. Wojtsekhowskif, X. Yann, H. Yaos, X. Zhanq, X. Zhengh aTel Aviv University, Tel Aviv 69978, Israel bUniversity of Kentucky, Lexington, Kentucky 40506, USA cNRCN, P.O.Box 9001, Beer-Sheva 84190, Israel dGeorge Washington University, Washington D.C. 20052, USA eFlorida International University, Miami, Florida 33199, USA fThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA gOld Dominion University, Norfolk, Virginia 23508, USA hUniversity of Virginia, Charlottesville, Virginia 22904, USA iINFN, gruppo collegato Sanitaand Istituto Superiore di Sanita, Department TESA, I-00161 Rome, Italy jRutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA kSaint Mary’s University, Halifax, Nova Scotia B3H 3C3, Canada lDalhousie University, Halifax, Nova Scotia B3H 3J5, Canada mKent State University, Kent, Ohio 44242, USA nSeoul National University, Seoul 151-747, Korea oCollege of William and Mary, Williamsburg, Virginia 23187, USA pDuke University, Durham, NC 27708, USA qMassachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA rLawrence Berkeley National Laboratory, Berkeley, California 94720, USA sTemple University, Philadelphia, Pennsylvania 19122, USA tUniversity of South Carolina, Columbia, South Carolina 29208, USA uUniversity of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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