Evidence for a three-nucleon-force effect in proton-deuteron elastic scattering

Abstract

Developments in spin-polarized internal targets for storage rings have permitted measurements of 197 MeV polarized protons scattering from vector polarized deuterons. This work presents measurements of the polarization observables A_y, iT_11, and C_y,y in proton-deuteron elastic scattering. When compared to calculations with and without three-nucleon forces, the measurements indicate that three-nucleon forces make a significant contribution to the observables. This work indicates that three-body forces derived from static nuclear properties appear to be crucial to the description of dynamical properties.

8 pages 2 figures Latex, submitted to Phys. Rev. Letters

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• Chiral Symmetry and Three-Nucleon Forces
• Weak capture of protons by protons
• Phenomenological spin-orbit three-body force
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• Resolving the Discrepancy of 135 MeV pd Elastic Scattering Cross Sections and Relativistic Effects
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• Precision measurement of vector and tensor analyzing powers in elastic deuteron-proton scattering
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• Testing nuclear forces by polarization transfer coefficients in d(\vec p, \vec p)d and d(\vec p,\vec d)p reactions at E^{lab}_p = 22.7 MeV
• Three-body break-up in deuteron-deuteron scattering at 65~MeV/nucleon
• A laser-driven target of high-density nuclear polarized hydrogen gas
• A new form of three-body Faddeev equations in the continuum
• Theoretical uncertainties of the elastic nucleon-deuteron scattering observables
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• Analyzing powers Ayy, Axx, Axz and Ay in the dd->3Hen reaction at 270 MeV
• The three-nucleon system as a laboratory for nuclear physics: the need for 3N forces
• Angular distributions of the vector Ay and tensor Ayy, Axx, Axz analyzing powers in the dd->3Hp reaction at 200 MeV
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• Few Body Reserch - Summary
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