Absolute Energy Standards for Van de Graaff Accelerators
The Van de Graaff accelerator provides a useful instrument for the determination of nuclear reaction Q-values and thus for the measurement of nuclidic mass-differences. This unique accelerator is usually operated so as to have beam energy-homogeneity of the order of one part in several thousand. To use particle beams of such precisely defined energy to determine nuclidic mass-differences however, it is necessary to ascertain, in an absolute manner, the energy of the particles. This paper will present the work done at Rice University on establishing such an energy standard. All of the Rice work has been on simple energy standards. It is our view that the calibration measurement of energy should be a simple one; they should all be laboratory standards that can be easily reproduced anywhere with a minimum of effort. Nevertheless, target preparation techniques are very important and it is unfortunate that space will not allow this subject to be discussed here. Professor Herb has discussed some aspects of this problem in a preceeding paper.
KeywordsMagnetic Spectrometer Energy Standard Tandem Accelerator Proton Resonance Frequency Graaff Accelerator
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