Abstract
An intense source of positrons in the MeV range is described. The positrons were produced by pair production of high energy prompt γ-rays from neutron capture reactions. The source consisted of layers of titanium and platinum and it was placed in the high thermal neutron flux (3.3 × 10 14 n/cm 2s) at the BILL beta spectrometer of the High Flux Reactor, Grenoble. The beta spectrometer served as a tunable monochromator. The system yielded 2.5 × 10 6 e +/s in 10 cm of the focal plane, with a momentum dispersion of Δp/ p = 1.5 × 10 −3 cm −1. A model for the numerical simulation of this positron production method was developed and the data are compared with the calculated spectra. A future application of the present positron production technique is presented, using the layers of cadmium and tungsten to produce a beam of moderated positrons.
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