Abstract
The background due to neutron scattering from the tantalum backing for lithium targets has been measured at neutron energies from 2 to 300 keV for neutrons emitted at an angle of 120° with respect to the direction of the proton beam. The method consists in measuring the unfiltered neutron flux in this direction with and without a second piece of tantalum attached to the backing of the targets and making the appropriate transmission corrections for the scattered neutrons. The background fraction is large at low energies but falls steeply with increasing neutron energy to about 6.5% at 10 keV. It subsequently decreases gradually to about 2.8% at 100 keV, where it begins to rise again and reaches a maximum of about 6.3% at 250 keV.
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