The beam from the Yale University Electron Accelerator has been used in systematic studies of the nuclear charge distributions of Ca 40 and Ca 48 . The beam energy has been varied between 20 and 60 MeV, and the angular distributions include angles between 70° and 150°. Elastic electron scattering has been used to obtain the rms radius of Ca 40 , and a value for the difference between the Ca 40 and Ca 48 radii. The results indicate that this difference is not as large as that predicted by the A 1/s rule, in agreement with the Stanford electron scattering work and the Chicago and CERN experiments on the spectra from muonic atoms. Inelastic scattering experiments also have been performed, yielding results for the reduced transition probability B(EL T ) and the transition radius R tr for the following states: Ca 40 , 3.73-MeV (3-), 3.90(2+), 6.94(2+, 3-); Ca 48 , 3.83-MeV (2+) and 4.51-MeV (3-).

Form factors obtained by the inelastic scattering of 60-MeV electrons from the first 2 + and 3" collective states of Sn 116 , Sn 118 , and Sn 120 are reported. The momentum transfer range covered is 0.3-0.6 F _1 . Reduced transition probabilities B(EL) and transition radii R tt 2 are extracted from the data, using a transition charge distribution with a radial dependence given by the derivative of a Fermi charge distribution, and the distorted-wave code DUELS. In addition, the parameters c and / for a ground-state Fermi charge distribution, obtained by elastic scattering, are reported for Sn 116 , Sn 118 , Sn 120 , and Sn 124 .

No abstract

No abstract