A neutron lens

@article{Kumakhov1992ANL,
  title={A neutron lens},
  author={Muradin Abubekirovich Kumakhov and V. A. Sharov},
  journal={Nature},
  year={1992},
  volume={357},
  pages={390-391}
}
SMOOTH hollow glass capillaries can be used to guide neutrons by multiple reflection at grazing angles along the inner walls. Here we show that a concentric arrangement of bent capillaries makes it possible to focus and increase the flux density of a neutron beam—a phenomenon that will have applications in areas such as prompt-gamma activation analysis and neutron depth profiling. 
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A METHOD for focusing X-rays by means of internal reflection inside hollow glass capillaries1–3has also been shown to be capable of guiding a neutron beam4 and now a neutron lens using this principleExpand
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