S — D Transition in the Nucleon-Nucleon System

  • Ingo Sick
Part of the Few-Body Systems book series (FEWBODY, volume 6)


Important properties of the fundamental nucleon-nucleon (N-N) interaction, especially for the isoscalar component, are still poorly known. This concerns in particular the SD transition amplitude. The accurate knowledge of this quantity is important for the calculation of some of the central quantities of nuclear physics:
  1. (i)

    For a nucleon-nucleon potential that explains the deuteron binding energy, the binding energy of the A =3,4 systems and nuclear matter strongly depend on the S—D transition; a stronger tensor force leads to a reduced binding energy. Of particular importance is the question whether these binding energies can be explained without introducing a three-body force. Only for a very weak tensor force can the binding energy be explained without invoking a three-body force.

  2. (ii)

    The probability of L =2 states in light nuclei depends directly on the strength of the S—D transition. Without accurate knowledge of these D-states, an understanding of light nuclei — test cases for the description of nuclei in terms of nucleons, as the Schrödinger equation can be exactly solved — remains incomplete.

  3. (iii)

    These L = 2 states have also important consequences for an understanding of non-nucleonic degrees of freedom. In the observables most sensitive to these non-nucleonic degrees of freedom — magnetic isovector form factors of light nuclei — S—D transitions and meson exchange currents have effects of the same size, but opposite sign. To determine the mesonic effects, one needs to accurately know the S—D transition contribution.



Neutron Beam Light Nucleus Tensor Force Phase Shift Analysis Meson Exchange Current 
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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Ingo Sick
    • 1
  1. 1.Universität BaselBaselSwitzerland

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