Abstract
The energy spectrum of inelastically scattered electrons at 180° was measured for 41.5 MeV electrons from the Stanford Mark II Linear Accelerator for the following elements: 1D 2, 3Li 6, 3Li 7, 7N 14, 8O 16, 9F 19, 10Ne 20, 11Na 23, 12Mg, 13Al 27, 15P 31, 16S 32, 18Ar 40, 19K 39, 20Ca 40 and 83Bi 209. Some of the elements investigated show clear evidence of excitation of nuclear levels. It is shown that these excitations are most likely due to magnetic dipole transitions. The experiment was performed under conditions in which the “long wave approximation” is approximately valid, so radiation widths were derived for the excited states. A comparison is made with the single particle model predictions. A systematic behaviour of some M1 transitions in light nuclei suggested recently by Kurath is supported by the data. The radiation tail was investigated in some detail and the large-angle bremsstrahlung formula of McCormick, Keiffer and Parzen was found to agree with the data for gas targets.
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