A boron-coated CCD camera for direct detection of Ultracold Neutrons (UCN)

Abstract

A new boron-coated CCD camera is described for direct detection of ultracold neutrons (UCN) through the capture reactions ${}^{10}$B (n,$\alpha$0$\gamma$)${}^7$Li (6%) and ${}^{10}$B(n,$\alpha$1$\gamma$)${}^7$Li (94%). The experiments, which extend earlier works using a boron-coated ZnS:Ag scintillator, are based on direct detections of the neutron-capture byproducts in silicon. The high position resolution, energy resolution and particle ID performance of a scientific CCD allows for observation and identification of all the byproducts $\alpha$, ${}^7$Li and $\gamma$ (electron recoils). A signal-to-noise improvement on the order of 10${}^4$ over the indirect method has been achieved. Sub-pixel position resolution of a few microns is demonstrated. The technology can also be used to build UCN detectors with an area on the order of 1 m${}^2$. The combination of micrometer scale spatial resolution, few electrons ionization thresholds and large area paves the way to new research avenues including quantum physics of UCN and high-resolution neutron imaging and spectroscopy.

arXiv comment10 pages, 8 figures

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Cited by in corpus (2)

• Needs, trends, and advances in scintillators for radiographic imaging and tomography
• Demonstration of Sub-micron UCN Position Resolution using Room-temperature CMOS Sensor