Abstract
High-resolution measurements of the temperature dependence of the roton lifetime and energy shift in superfluid 4He have been performed using the IN20 thermal neutron triple-axis spectrometer spin-echo option (TASSE). This experiment constitutes the first implementation of the spin-echo technique for inelastic neutron scattering measurements on IN20 using the optimized field-shape superconducting precession coils. An energy resolution of 0.7 μeV was achieved and the results are in agreement with previous studies. The use of additional gradient coils enables to substantially improve the energy and the momentum transfer resolution, and to match excitation dispersion slopes and curvatures. This setup is designed to reach the nano-eV energy resolution in the case of quasi-elastic scattering experiments.
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