Transverse isoscalar excitations in 24Mg by 180 degrees electron scattering.

Abstract

Transverse electron scattering form factors have been measured for isoscalar transitions to T=0 levels in $^{24}\mathrm{Mg}$ at 1.37 MeV (${J}^{\ensuremath{\pi}}$${=2}^{+}$), 5.24 MeV (${3}^{+}$), 6.01 MeV (${4}^{+}$), and for the unresolved T=0 doublet at 4.12 MeV (${4}^{+}$) and 4.24 MeV (${2}^{+}$). Because of the large longitudinal form factors for these transitions, sometimes exceeding the transverse form factor by more than a factor of ${10}^{4}$, it was necessary to observe electrons scattered at 180\ifmmode^\circ\else\textdegree\fi{} so that longitudinal scattering was minimized. Several incident energies from 80.1 to 200.5 MeV were used to span effective momentum transfers from 0.84 to 2.07 ${\mathrm{fm}}^{\mathrm{\ensuremath{-}}1}$. Results are compared with predictions calculated using Dirac wave functions for the nuclear bound states in a Woods-Saxon potential well.