Abstract
A modulated intensity by zero effort (MIEZE) spectrometer is a type of neutron-resonance spin-echo spectrometer and can be used to analyze the slow dynamics of condensed matter by measuring the intermediate scattering function I(Q,τ). A crucial feature of a MIEZE spectrometer is it leaves completely free the space between the sample and the detector because the sample is placed after the neutron-spin analyzer. Measuring the magnetic dynamics with a conventional neutron-spin-echo spectrometer is difficult, but with a MIEZE spectrometer such a measurement may be done simply by introducing a second analyzer after the sample. Measuring the magnetic dynamics with high precision requires the background to be reduced to a minimum and is a job for which a 3He neutron-spin filter (3He-NSF) is a promising candidate as a second analyzer. However, one difficulty with this approach is the diffusion of 3He gas from the 3He-NSF, which may be measured and interpreted as dynamics. Therefore, we investigate herein whether the dynamics of gas diffusion is detected when using a 3He-NSF as second analyzer in a MIEZE spectrometer. Toward this end, we experimented with the MIEZE spectrometer installed at beamline 06 (BL06) at the Materials and Life Science Experimental Facility at Japan Proton Accelerator Research Complex (J-PARC MLF). The results confirm that the gas-diffusion dynamics of the 3He-NSF are not detected, and that the 3He-NSF, therefore, can be used as a second analyzer in this MIEZE spectrometer.
Highlights
A modulated intensity by zero effort (MIEZE) spin-echo spectrometer is a type of resonance spin-echo spectrometer
We measured in this study the MIEZE signal with and without the 3He neutron-spin filter (3He-NSF) as second analyzer to investigate whether the diffusion of 3He gas is detected
Before observing the MIEZE signal, we ensured that the guide magnetic field of the MIEZE spectrometer and the magnetic field of the solenoid coil of 3He-NSF were adiabatically connected for polarized neutrons
Summary
A MIEZE spin-echo spectrometer is a type of resonance spin-echo spectrometer. As with conventional spin-echo spectrometers, it offers high energy resolution and is a powerful tool for studying slow dynamics in condensed matter because it can measure the intermediate scattering function I(Q,τ), where Q and τ are the momentum transfer of neutrons and the Fourier time, respectively [1,2,3]. We measured in this study the MIEZE signal with and without the 3He-NSF as second analyzer to investigate whether the diffusion of 3He gas is detected.
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