From 84a3d4ae5962bb6ce15e126c196b483f9817f856 Mon Sep 17 00:00:00 2001 From: nam Date: Thu, 30 Oct 2014 19:00:12 +0900 Subject: [PATCH] chap8 --- thesis/chapters/chap8_conclusions.tex | 31 +++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 thesis/chapters/chap8_conclusions.tex diff --git a/thesis/chapters/chap8_conclusions.tex b/thesis/chapters/chap8_conclusions.tex new file mode 100644 index 0000000..ca92006 --- /dev/null +++ b/thesis/chapters/chap8_conclusions.tex @@ -0,0 +1,31 @@ +\chapter{Conclusions} +\label{cha:conclusions} +AlCap is an experiment proposed at PSI to study charged particles, neutrons +and photons emitting after nuclear muon capture on aluminium. These +measurements are important for backgrounds and hit rates estimation of the new +generation of \mueconv experiments, COMET and Mu2e. In the first stage of the +COMET experiment, hit rate on its main tracking detector is anticipated to be +dominated by low energy protons following muon capture on an aluminium target, +which has never been measured. + +The first run of the AlCap which aims for proton measurement has been carried +out in 2013. Data analysis is in progress. An initial analysis on partial data +was done with the main results are: +\begin{enumerate} + \item Demonstration of the analysis chain from raw waveforms to physics + events; + \item Validation of the experimental method including: number of nuclear + capture muons normalisation by muonic X-ray measurement, charged particle + identification by specific energy loss, and unfolding of the proton energy + spectrum using the iterative Bayesian method; + \item Obtaining preliminary results on proton emission rate and spectrum: + the proton spectrum has a peak at \SI{4}{\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 + emission rate assuming the shape holds for the whole spectrum is + $(3.5\pm0.2)$. +\end{enumerate} +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.