Contamination from the next higher incident energy in inelastic neutron scattering measurements with multiple incident energies on chopper spectrometers

A highly efficient measurement technique utilizing multiple incident energies (Eis) simultaneously on a neutron chopper spectrometer has recently become popular in inelastic neutron scattering studies of condensed matter. However, the inelastic scattering spectrum of a target incident energy can be contaminated by the scattering process of other Eis. In this study, we quantitatively evaluated the extent to which the spectrum of a target Ei in this type of measurement can be contaminated by the scattering process of the next higher Ei. We estimated the relative intensity of the scattering from the next higher Ei for the neutron chopper spectrometers 4SEASONS and AMATERAS at the Japan Proton Accelerator Research Complex (J-PARC).