Abstract
Small-angle neutron scattering (SANS) is an important tool to investigate material properties in nanometer to micrometer scale. The opportunity to conduct SANS experiments is, however, limited because of the low number of available SANS beam lines. Compact neutron sources are expected to play a significant role to increase neutron scattering facilities including SANS beam lines. The problem is that the flux of compact neutron sources can be very low, which makes it difficult to measure scattered neutrons from a sample. A SANS geometry with ring-shaped collimated beam (r-SANS) is developed to conduct SANS experiments at very low flux neutron sources. By using ring-shaped collimated neutrons to hit a large sample, the scattered neutron flux becomes high on the ring center line because the scattered neutrons with each scattered angle overlaps on each point of the ring center line. By setting a 3He point detector on the center line and shielding the surrounding of the small detection area well, high signal to noise ratio experiments are possible. In this paper, we show the concept of this new geometry and a preliminary experimental result of a glassy carbon sample taken with the r-SANS geometry constructed at Kyoto University proton Accelerator Neutron Source (KUANS).
Highlights
Small-angle neutron scattering (SANS) aims to study the structure of matter ranging from nanometer to micrometer scales [1]
The measured scattering intensity of the glassy carbon sample is shown in Fig. 3 as well as the reference result of a SANS measurement for the same product sample [6]
In order to conduct SANS experiments at very low flux neutron sources, we propose a new geometry with ringshaped collimated beam (r-SANS)
Summary
Small-angle neutron scattering (SANS) aims to study the structure of matter ranging from nanometer to micrometer scales [1]. Focusing SANS geometries enable us to utilize more neutrons from a pinhole slit using ellipsoidal focusing mirrors [3] These methods have its own advantages and disadvantages, which depend on different conditions such as the momentum transfer resolution needed in the experiment, the available neutron energy, and the scattering intensity of a sample. A SANS geometry with ring-shaped collimated beams (rSANS) is developed in order to utilize more neutrons at compact neutron sources whose flux is very low. For other fields such as steel industries, which are interested on the average structure of their products, the sample size can be acceptable Another limitation of the geometry is that anisotropic scattering of the sample is not distinguished because the detected neutrons are coming from different positions of the sample to the ring center line. Since r-SANS geometry uses cross-talk neutrons collimated with the three ring-shaped slits, it causes additional scattered neutrons from the sample
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