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

## TL;DR

This paper introduces a boron-coated CCD camera capable of directly detecting ultracold neutrons with high spatial and energy resolution, significantly improving detection sensitivity and enabling advanced research in quantum physics and neutron imaging.

## Contribution

The paper presents a novel boron-coated CCD detector for direct UCN detection, achieving high resolution and signal-to-noise ratio improvements over previous indirect methods.

## Key findings

- Achieved a signal-to-noise ratio improvement of 10^4
- Demonstrated sub-pixel position resolution of a few microns
- Enabled large-area UCN detection suitable for advanced research

## 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.

---
Source: https://tomesphere.com/paper/1903.01335