The neutron-proton charge-exchange amplitudes measured in the dp → ppn reaction

  • D. Mchedlishvili
  • S. Barsov
  • J. Carbonell
  • D. Chiladze
  • S. Dymov
  • A. Dzyuba
  • R. Engels
  • R. Gebel
  • V. Glagolev
  • K. Grigoryev
  • P. Goslawski
  • M. Hartmann
  • A. Kacharava
  • V. Kamerdzhiev
  • I. Keshelashvili
  • A. Khoukaz
  • V. Komarov
  • P. Kulessa
  • A. Kulikov
  • A. Lehrach
  • N. Lomidze
  • B. Lorentz
  • G. Macharashvili
  • R. Maier
  • S. Merzliakov
  • M. Mielke
  • M. Mikirtychyants
  • S. Mikirtychyants
  • M. Nioradze
  • H. Ohm
  • M. Papenbrock
  • D. Prasuhn
  • F. Rathmann
  • V. Serdyuk
  • H. Seyfarth
  • H. J. Stein
  • E. Steffens
  • H. Stockhorst
  • H. Ströher
  • M. Tabidze
  • S. Trusov
  • Yu. Uzikov
  • Yu. Valdau
  • C. Wilkin
Open Access
Regular Article - Experimental Physics

Abstract.

The unpolarised differential cross section and the two deuteron tensor analysing powers Axx and Ayy of the \(\vec dp \to \{ pp\} _s n\) charge-exchange reaction have been measured with the ANKE spectrometer at the COSY storage ring. Using deuteron beams with energies 1.2, 1.6, 1.8, and 2.27GeV, data were obtained for small momentum transfers to a {pp}s system with low excitation energy. The results at the three lower energies are consistent with impulse approximation predictions based upon the current knowledge of the neutron-proton amplitudes. However, at 2.27GeV, where these amplitudes are far more uncertain, agreement requires a reduction in the overall double-spin-flip contribution, with an especially significant effect in the longitudinal direction. These conclusions are supported by measurements of the deuteron-proton spin-correlation parameters Cx,x and Cy,y that were carried out in the \(\vec d\vec p \to \{ pp\} _s n\) reaction at 1.2 and 2.27GeV. The values obtained for the proton analysing power Ayp also suggest the need for a radical re-evaluation of the neutron-proton elastic scattering amplitudes at the higher energy. It is therefore clear that such measurements can provide a valuable addition to the neutron-proton database in the charge-exchange region.

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Copyright information

© The Author(s) 2013

Authors and Affiliations

  • D. Mchedlishvili
    • 1
    • 2
  • S. Barsov
    • 3
  • J. Carbonell
    • 4
  • D. Chiladze
    • 1
    • 2
  • S. Dymov
    • 5
    • 6
  • A. Dzyuba
    • 3
  • R. Engels
    • 2
  • R. Gebel
    • 2
  • V. Glagolev
    • 7
  • K. Grigoryev
    • 2
    • 3
  • P. Goslawski
    • 8
  • M. Hartmann
    • 2
  • A. Kacharava
    • 2
  • V. Kamerdzhiev
    • 2
  • I. Keshelashvili
    • 1
    • 9
  • A. Khoukaz
    • 8
  • V. Komarov
    • 5
  • P. Kulessa
    • 10
  • A. Kulikov
    • 5
  • A. Lehrach
    • 2
  • N. Lomidze
    • 1
  • B. Lorentz
    • 2
  • G. Macharashvili
    • 1
    • 5
  • R. Maier
    • 2
  • S. Merzliakov
    • 2
    • 5
  • M. Mielke
    • 8
  • M. Mikirtychyants
    • 2
    • 3
  • S. Mikirtychyants
    • 2
    • 3
  • M. Nioradze
    • 1
  • H. Ohm
    • 2
  • M. Papenbrock
    • 8
  • D. Prasuhn
    • 2
  • F. Rathmann
    • 2
  • V. Serdyuk
    • 2
  • H. Seyfarth
    • 2
  • H. J. Stein
    • 2
  • E. Steffens
    • 6
  • H. Stockhorst
    • 2
  • H. Ströher
    • 2
  • M. Tabidze
    • 1
  • S. Trusov
    • 11
  • Yu. Uzikov
    • 5
    • 12
  • Yu. Valdau
    • 2
    • 3
  • C. Wilkin
    • 13
  1. 1.High Energy Physics InstituteTbilisi State UniversityTbilisiGeorgia
  2. 2.Institut für Kernphysik and Jülich Centre for Hadron PhysicsForschungszentrum JülichJülichGermany
  3. 3.High Energy Physics DepartmentPetersburg Nuclear Physics InstituteGatchinaRussia
  4. 4.Institut de Physique NucléaireUniversité Paris-Sud, IN2P3-CNRSOrsay CedexFrance
  5. 5.Laboratory of Nuclear ProblemsJINRDubnaRussia
  6. 6.Physikalisches Institut IIUniversität Erlangen-NürnbergErlangenGermany
  7. 7.Laboratory of High EnergiesJINRDubnaRussia
  8. 8.Institut für KernphysikUniversität MünsterMünsterGermany
  9. 9.Department of PhysicsUniversity of BaselBaselSwitzerland
  10. 10.H. Niewodniczański Institute of Nuclear Physics PANKrakówPoland
  11. 11.Institut für Kern- und HadronenphysikForschungszentrum RossendorfDresdenGermany
  12. 12.Department of PhysicsM. V. Lomonosov Moscow State UniversityMoscowRussia
  13. 13.Physics and Astronomy DepartmentUCLLondonUK

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