Pulsed neutron time-dependent intensity modulation for quasi-elastic neutron scattering spectroscopy

We propose a basic formula and demonstration for a high-resolution quasi-elasticneutron scattering (QENS) by combining thetime-of-flight(TOF) method with Modulation of Intensity by Zero Effort (MIEZE) typeneutronspin echospectroscopy. The MIEZE technique has the potential to develop a unique approach to study on slow dynamics of condensed matter; however, the energy resolution is limited owing to the hypersensitivity of the MIEZE signal contrast to the echo condition, which is strongly affected by the alignment of the instruments and the sample. The narrow allowance of the optimal alignment is a major obstacle to the wide use of this technique. Combining theTOF method with MIEZE (TOF-MIEZE), the hypersensitivity of MIEZE signals is significantly alleviated with a short pulsed beam. This robustness is very useful to optimize experimental alignments and enables accuratemeasurements of QENS. The experimental results demonstrate the characteristic of the TOF-MIEZE technique and are well described by the formula presented in this study.

Source: Review of Scientific Instruments - October 27, 2016 Category: Physics Authors: T. Oda, M. Hino, M. Kitaguchi, P. Geltenbort and Y. Kawabata Source Type: research