S. Barshay et A. Bramon, PHOTOPRODUCTION OF ETA-MESONS ON NUCLEI AS A UNIQUE PROBE OF THE COHERENT, ISOSCALAR VECTOR-MESON FIELD NEAR THE NUCLEAR-SURFACE, Modern physics letters A, 9(19), 1994, pp. 1727-1733
With the partial width for eta --> 2gamma determined by recent measure
ments in the process e+e- --> e+e-eta, we re-examine older data on the
Primakoff effect. We show that photoproduction on nuclei can be used
to determine the strength and the A-dependence of the coherent, isosca
lar vector-meson field of the nuclei.