 In R2013, two BC501 neutron
counters ($5''$ diameter  and $5''$ depth) were borrowed from the
MuSun experiment, and placed outside the vacuum chamber on
both sides of the muon beam and centred on the stopping
target. Neutron spectra between 1 to about 20 MeV were obtained.  The lower
threshold is limited by pulse shape discrimination (PSD) which
identifies neutron from photon events.  Calibration of the detector
energy primarily used Cs-137 and Co-60, however these sources proved
inadequate. The Cs-127 Compton edge was too low in energy to be useful
and the Co-60 has two overlapping Compton edges. An average of the
two edge energies was used for calibration. An AmBe source was
originally intended to provide a known neutron spectrum and it did prove
useful in providing a 4.19 MeV gamma line for calibration. A ratio of the fast to slow
integrated waveform components  
was used to provide neutron/gamma discrimination. 
Discrimination is excellent above 1 MeVee, Figure~\ref{psdplot_2013}. 
Analysis of the R2013 data demonstrated that a waveform digitiser of
at least 250 MHz sampling rate is needed to optimise the pulse shape
discrimination.  A raw neutron spectrum is shown in Figure
~\ref{neutron_spectrum}. Initial work on unfolding the
spectrum has begun and is described in a later section. \\

\begin{figure}[btp] 
	\centering
	\includegraphics[width=0.55\textwidth]{figs/PSD1} 
	\caption{Pulse shape discrimination between
    neutrons (top band)  and gammas (bottom band). The true neutron
    energy is approximately twice the energy deposited in
    MeVee.} \label{psdplot_2013}
\end{figure} 


\begin{figure}[btp] 
	\centering
	\includegraphics[width=0.55\textwidth]{figs/Neutron_Spectrum} 
	\caption{Raw neutron spectrum from an $Al$
          target. The horizontal axis is electron equivalent energy
          which is approximately a factor of 2 greater than the recoil
          proton energy, which is of course folded by the detector
          response function. \label{neutron_spectrum}. }
\end{figure} 


