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The AlCap is an experiment which precisely measures products of
nuclear muon capture on aluminum. It is a joint project between COMET and Mu2e
collaborations since both experiments intend to search for lepton flavor
violating conversion $\mu^-+A\rightarrow e^-+A$ where the capture products
would cause significant issues on detector hit rates, radiation damage, and
backgrounds.

The first run of AlCap has been carried out at PSI in December 2013 for
protons measurement. Initial analysis showed that emission rate of protons from
4 to 8 MeV is $(1.7 \pm 0.1)$ per nuclear muon capture. The proton spectrum
peaks at 3.7 MeV and decreases exponentially with a decay constant of 2.6 MeV.
Two more runs are scheduled in June (for neutrons and photons), and October
(for protons) 2015.


%The AlCap experiment is a joint project between the COMET and Mu2e
%collaborations. Both experiments intend to look for the lepton-flavour
%violating conversion $\mu^-+A\rightarrow e^-+A$, using tertiary muons from high-power pulsed
%proton beams. In these experiments the products of ordinary muon capture in the
%muon stopping target are an important concern, both in terms of hit rates in
%tracking detectors and radiation damage to equipment. The goal of the AlCap
%experiment is to provide precision measurements of the products of nuclear
%capture on Aluminium, which is the favoured target material for both COMET and
%Mu2e. The results will be used for optimising the design of both conversion
%experiments, and as input to their simulations. Data was taken in December 2013
%and is currently being analysed. 
  
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