  Position-sensitive detection of ultracold neutrons (UCNs) is demonstrated
using an imaging charge-coupled device (CCD) camera. A spatial resolution less
than 15 $\mu$m has been achieved, which is equivalent to an UCN energy
resolution below 2 pico-electron-volts through the relation $\delta E = m_0g
\delta x$. Here, the symbols $\delta E$, $\delta x$, $m_0$ and $g$ are the
energy resolution, the spatial resolution, the neutron rest mass and the
gravitational acceleration, respectively. A multilayer surface convertor
described previously is used to capture UCNs and then emits visible light for
CCD imaging. Particle identification and noise rejection are discussed through
the use of light intensity profile analysis. This method allows different types
of UCN spectroscopy and other applications.
