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thesis/chapters/frontmatter.tex

@@ -25,11 +25,21 @@ approach in which the first phase, COMET Phase-I [3], starts in 2013 and
 initial data taking in around 2017. 
 
 In order to optimize detector design for the Phase-I, backgrounds from nuclear
-muon capture are crucial. We have proposed a dedicated experiment , namely
-AlCap, at PSI, Switzerland to study the backgrounds, including: heavy charged
-particles, neutrons and photons. The measurements of heavy charged particles
-have been carried out in the 2013 run and the preliminary analysis results are
-presented in this thesis.
+muon capture are crucial. We have proposed a dedicated experiment, namely
+AlCap, at PSI, Switzerland to study the backgrounds, including protons,
+neutrons and photons. The measurements of proton rate and spectrum on
+aluminium have been carried out in the 2013 run. The second run to study
+neutrons and photons is planned in 2015.
+
+The preliminary results from the analysis of the 2013 run are presented in this
+thesis. The measured proton spectrum peaks at \SI{4}{\MeV} and decays
+exponentially with the decay constant of \SI{2.6}{\MeV}. The emission
+rate of protons in the energy range from \SIrange{4}{8}{\MeV} is
+$(1.7\pm0.1)\%$. The total proton emission rate is estimated to be
+$(3.5\pm0.2)\%$ assuming the spectrum shape holds.
+The resulted proton rate and spectrum were used to optimise the tracking
+detector hit rate of the COMET Phase-I.
+
 \end{abstract}
 
 
@@ -58,7 +68,7 @@ presented in this thesis.
 %\begin{preface}
   %\thispagestyle{empty}
   %The thesis is about measurements of products of nuclear muon capture on an
-  %aluminum target, which is important for optimization of a tracking detector
+  %aluminium target, which is important for optimization of a tracking detector
   %of a search for muon to electron conversion, the E21 experiment - so called
   %COMET - at Japan Proton Accelerator Complex (J-PARC).
 %\end{preface}