status saved

thesis/chapters/chap8_conclusions.tex

@@ -22,20 +22,26 @@ was made. The main results are:
   \item obtaining preliminary results on proton emission rate and spectrum:
     the proton spectrum has a peak at \SI{3.7}{\MeV}, then reduces exponentially
     with a decay constant of \SI{2.6}{\MeV}. The partial emission rate in the
-    energy range from \SIrange{4}{8}{\MeV} is $(1.7 \pm 0.1)\%$, and the total
+    energy range from \SIrange{4}{8}{\MeV} is $(1.7 \pm 0.1)\%$ per nuclear
+    muon capture, and the total
     emission rate assuming the shape holds for the whole spectrum is
-    $(3.5\pm0.2)\%$.
+    $(3.5\pm0.2)\%$ per nuclear muon capture.
 \end{enumerate}
 The emission rate is consistent with the lower limit of 2.8\% set by
 Wyttenbach et al.~\cite{WyttenbachBaertschi.etal.1978}. It is also compatible
 with the theoretical calculation by Lifshitz and
-Singer~\cite{LifshitzSinger.1980}. Compared with the emission rate from
-silicon, our result is smaller.
+Singer~\cite{LifshitzSinger.1980}. Compared with the existing result on
+silicon~\cite{SobottkaWills.1968}, the emission rate from aluminium is
+significantly smaller and the spectrum is softer.
 
 The proton rate and spectrum have been used to optimise the planned proton
 absorber for the drift chamber of the COMET Phase-I. The resulted proton hit
 rate with the baseline configuration is very small compared with the current
-figure. It is safe to remove the proton absorber altogether. This would make
-a strong impact to the drift chamber design. The AlCap experiment is going to
+figure.The recommendation to the COMET Phase-I is to remove the proton
+absorber altogether. The momentum resolution of the drift chamber will be
+slightly improved, and the level of integrated charge will still remain below
+the safe level for the chamber.
+
+The AlCap experiment is going to
 submit a beam time request for the 2015 run to collect more data and other
 measurements for neutrons and gamma rays.