Electron scattering form factors of stretched transitions using Woods-Saxon wave functions.

Abstract

Electron scattering form factors for stretched transitions are computed using radial wave functions from realistic nuclear potentials, including the unbound nature of final states above particle decay thresholds. The calculated form factors are compared to data for 4/sup -/ states in /sup 12/C, /sup 14/C, and /sup 16/O, 6/sup -/ states in /sup 24/Mg, /sup 26/Mg, and /sup 28/Si, 8/sup -/ states in /sup 48/Ca, /sup 54/Fe, /sup 58/Ni, and /sup 60/Ni, the 10/sup -/ state in /sup 90/Zr, and the 14/sup -/ state in /sup 208/Pb. We assess the fraction of the single-particle sum rule strengths using these realistic nuclear potentials in place of the standard results using harmonic oscillator wave functions. Appreciably greater fractions are obtained for low mass nuclei in the present work, totalling 105% of the sum strength for /sup 12/C and 81% for /sup 16/O. Much less damping of the magnetic strength is thus experimentally observed than is the case when oscillator wave functions are used for comparison. The results of including meson exchange currents in the analysis are also discussed.