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Copper activation deuterium-tritium neutron yield measurements at the National Ignition Facility
G W Cooper1, C L Ruiz, R J Leeper
1Chemical and Nuclear Engineering Department, University of New Mexico, Albuquerque, 87131, USA. gcoope@sandia.gov
Abstract:
A DT neutron yield diagnostic based on the reactions, (63)Cu(n,2n)(62)Cu(β(+)) and (65)Cu(n,2n)( 64) Cu(β(+)), has been fielded at the National Ignition Facility (NIF). The induced copper activity is measured using a NaI γ-γ coincidence system. Uncertainties in the 14-MeV DT yield measurements are on the order of 7% to 8%. In addition to measuring yield, the ratio of activities induced in two, well-separated copper samples are used to measure the relative anisotropy of the fuel ρR to uncertainties as low as 5%.
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