Kern-Anregung durch elektronen

Cross-sections for the electron excitation of γ-ray fluorescence

“…Zα(E/pc) ≪ 1, where Z is the proton number of the nucleus. As discussed by Robl, [2] there is also an upper limitation of the photon energy E γ of about 10 MeV which is not of concern for the present work, because we are studying transitions of much lower energy.…”

“…The cross section for the excitation by an incident electron of an M L transition from a ground nuclear state |g to an excited nuclear state |e can be written in the Born approximation as [2] σ M L = 2I e + 1 2I g + 1h…”

“…This type of nuclear excitation is no longer restricted by the requirement of the existence of a near resonance between the atomic and nuclear transition energies, and is in principle open to all nuclear species. Cross sections for the nuclear activation by electrons of γ-ray fluorescence have been calculated in this work using the results of Robl, [2] who gave expressions of the cross sections in the Born approximation, for magnetic and electric multipole transitions of arbitrary order.…”