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Title: Hard Photodisintegration of a Proton Pair

We present the first 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. An s^{-11} scaling of the cross section was observed, as predicted by the constituent counting rule. The onset of the scaling is at a higher energy and the cross section is significantly lower then for 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.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [9] ;  [6] ;  [10] ;  [9] ;  [7] ;  [11] ;  [12] ;  [6] ;  [13] more »;  [14] ;  [14] ;  [15] ;  [6] ;  [8] ;  [16] ;  [6] ;  [6] ;  [17] ;  [14] ;  [18] ;  [19] ;  [2] ;  [5] ;  [20] ;  [6] ;  [16] ;  [21] ;  [22] ;  [18] ;  [18] ;  [14] ;  [6] ;  [23] ;  [6] ;  [15] ;  [22] ;  [2] ;  [8] « less
  1. Tel Aviv Univ., Tel Aviv Israel
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Nuclear Research Center -Negev, Beer-Sheva, Israel
  4. George Washington Univ., Washington, DC (United States)
  5. Florida Intl Univ., Miami, FL (United States)
  6. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  7. Old Dominion Univ., Norfolk, VA (United States)
  8. Univ. of Virginia, Charlottesville, VA (United States)
  9. National Inst. of Nuclear Physics (INFN), Rome (Italy)
  10. Univ. of Kentucky, Lexington, KY (United States)
  11. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Rutgers Univ., Piscataway, NJ (United States)
  12. Saint Mary's Univ., Halifax, Nova Scotia, Canada; Dalhousie Univ., Halifax, Nova Scotia, Canada
  13. Rutgers Univ., Piscataway, NJ (United States)
  14. Kent State Univ., Kent, OH (United States)
  15. Seoul National Univ. (Korea, Republic of)
  16. Saint Mary's Univ., Halifax, Nova Scotia, Canada
  17. College of William and Mary, Williamsburg, VA (United States)
  18. Tel Aviv Univ., Tel Aviv, Israel
  19. Duke Univ., Durham, NC (United States)
  20. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  21. Univ. of Virginia, Charlottesville, VA (United States); Temple Univ., Philadelphia, PA
  22. Temple Univ., Philadelphia, PA
  23. Univ. of Illinois, Urbana, IL (United States)
Publication Date:
OSTI Identifier:
980896
Report Number(s):
JLAB-PHY--09-1050; DOE/OR/23177--0957
Journal ID: ISSN 0370-2693; TRN: US1003961
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 684; Journal Issue: 2-3; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 74 ATOMIC AND MOLECULAR PHYSICS; CROSS SECTIONS; DEUTERONS; ENERGY; NEUTRONS; PHOTONS; PHOTONUCLEAR REACTIONS; PROTONS; SCALING; YIELDS