Chemically homogeneous boron carbide 10B/11B isotope modulated neutron interference mirrors
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866917633180303360 |
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| author | Birch, J. Stendah, S. Dorri, S. Zubayer, A. Ghafoor, N. Eriksson, F. |
| author_facet | Birch, J. Stendah, S. Dorri, S. Zubayer, A. Ghafoor, N. Eriksson, F. |
| contents | We introduce a novel type of neutron interference mirrors based on a chemically homogeneous BxC (x>4) matrix with internal high precision 10B/11B isotope modulation. Simulations predict that these mirrors exhibit very high neutron reflectivities for a small number of bilayer periods. This is experimentally confirmed by neutron reflectivity measurements of mirrors synthesized by ion-assisted magnetron sputter deposition. For example, a 120 nm thick multilayer consisting of just 20 bilayer periods of 10B5.7C/11B5.7C, with a periodicity of 61.5 Å, exhibits a neutron reflectivity of 13 percent at an incidence angle of 4.7 deg for neutrons with a wavelength of 4.825 Å. This is attributed to a high scattering length density contrast between the layers with an interface width <5 Å. Structural analyses by X-ray diffraction, X-ray reflectivity, and transmission electron microscopy demonstrate that the 10B5.7C/11B5.7C multilayer mirrors are composed of amorphous, chemically homogenous B5.7C, without any internal chemical modulation. The data show that 10BxC/11BxC multilayer mirrors have the potential for higher neutron reflectivities at higher q-values using fewer and thinner layers, compared to todays state-of-the-art chemically modulated neutron multilayer mirrors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_04934 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Chemically homogeneous boron carbide 10B/11B isotope modulated neutron interference mirrors Birch, J. Stendah, S. Dorri, S. Zubayer, A. Ghafoor, N. Eriksson, F. Materials Science We introduce a novel type of neutron interference mirrors based on a chemically homogeneous BxC (x>4) matrix with internal high precision 10B/11B isotope modulation. Simulations predict that these mirrors exhibit very high neutron reflectivities for a small number of bilayer periods. This is experimentally confirmed by neutron reflectivity measurements of mirrors synthesized by ion-assisted magnetron sputter deposition. For example, a 120 nm thick multilayer consisting of just 20 bilayer periods of 10B5.7C/11B5.7C, with a periodicity of 61.5 Å, exhibits a neutron reflectivity of 13 percent at an incidence angle of 4.7 deg for neutrons with a wavelength of 4.825 Å. This is attributed to a high scattering length density contrast between the layers with an interface width <5 Å. Structural analyses by X-ray diffraction, X-ray reflectivity, and transmission electron microscopy demonstrate that the 10B5.7C/11B5.7C multilayer mirrors are composed of amorphous, chemically homogenous B5.7C, without any internal chemical modulation. The data show that 10BxC/11BxC multilayer mirrors have the potential for higher neutron reflectivities at higher q-values using fewer and thinner layers, compared to todays state-of-the-art chemically modulated neutron multilayer mirrors. |
| title | Chemically homogeneous boron carbide 10B/11B isotope modulated neutron interference mirrors |
| topic | Materials Science |
| url | https://arxiv.org/abs/2404.04934 |