| Issue |
EPJ Web Conf.
Volume 219, 2019
International Workshop on Particle Physics at Neutron Sources (PPNS 2018)
|
|
|---|---|---|
| Article Number | 10005 | |
| Number of page(s) | 6 | |
| Section | Instrumentation and Techniques | |
| DOI | https://doi.org/10.1051/epjconf/201921910005 | |
| Published online | 12 December 2019 | |
https://doi.org/10.1051/epjconf/201921910005
Neutron scattering cross section of diamond nanoparticles
1 Neutron Science Section, Materials & Life Science Division, J-PARC Center, Tokai, Ibaraki, Japan
2 Neutron Science Laboratory, High Energy Accelerator Research Organization, Tokai, Ibaraki, Japan
a e-mail: kenji.mishima@kek.jp
Published online: 12 December 2019
Due to their large coherent scattering cross section, diamond nanoparticles (DNPs) are considered as a promising candidate material for a new neutron reflector. For investigation of scattering cross sections of packed samples, we have developed a technique for mechanical compression of DNP powder. Application of 220 MPa allowed us to increase the bulk density from 0.40 g/cm3 to 1.1 g/cm3. The differential cross sections of uncompressed and packed samples were measured using the high-intensity total diffractometer instrument NOVA at J-PARC, covering transfer wavenumbers (q) from 0.6 to 100 nm−1. The q dependence for the compressed sample agreed with the theoretical expectation derived from the Born approximation applied to homogeneous spheres with inclusion of a hard-sphere model to account for the inter-particle structure, whereas the results obtained from the powder sample disagreed. This implies that the theoretical description does not well represent the mesoscopic structure of the DNP powder sample.
© The Authors, published by EDP Sciences, 2019
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