Isoscalar and Isovector Electromagnetic Properties of Few-Nucleon Systems

摘要

The recent results from electron scattering (elastic and threshold break-up) on 2- and 3-nucleon systems are presented. The separation of the charge (timelike) or magnetic (spacelike) and isoscalar or isovector components of the observables will be of greatest help for the forthcoming necessary global and coherent comparison and description of the A=2 and A=3 systems. The presented experimental results will be illustrated by some of the most recent theoretical calculations including non nucleonic degrees of freedom: comparisons will mainly be done with mesonic approaches; calculations introducing explicitly quark degrees of freedom will be illustrated simply in the case of the /sup 3/He charge form factor. Details on the different theoretical approaches illustrated in the present report are to be found in the theoretical contributions to this Conference, and in the quoted references. (ERA citation 13:041931)