Welcome to the AlCap Experiment
PSI Experiment R-13-03, spokespersons
P. Kammel and Y. Kuno
Set-up Run 2013
Charged particle spectra after muon capture
- WP1: Charged Particle Emission after Muon
Protons emitted after nuclear muon capture in the
stopping target dominate the single-hit rates in the
tracking chambers for both the Mu2e and COMET Phase-I
experiments. We plan to measure both the total rate
and the energy spectrum to a precision of 5% down to
proton energies of 2.5 MeV.
- WP2: Gamma and X-ray Emission after Muon Capture.
A Ge detector will be used to measure X-rays from the
muonic atomic cascade, in order to provide the
muon-capture normalization for WP1, and is essential
for very thin stopping targets. It is also the primary
method proposed for calibrating the number of muon
stops in the Mu2e and COMET experiments. Two
additional calibration techniques will also be
explored; (1) detection of delayed gamma rays from
nuclei activated during nuclear muon capture, and (2)
measurement of the rate of photons produced in
radiative muon decay.
- WP3: Neutron Emission after Muon Capture.
Neutron rates and spectra after capture in Al and Ti
are not well known. In particular, the low energy
region below 10 MeV is important for determining
backgrounds in the Mu2e/COMET detectors and veto
counters as well as evaluating the radiation damage to
electronic components. Carefully calibrated liquid
scintillation detectors, employing neutron-gamma
discrimination and spectrum unfolding techniques, will
measure these spectra. The measurement will attempt to
obtain spectra as low or lower than 1 MeV up to 10
Argonne National Laboratory – Boston University – Brookhaven National Laboratory –
Fermilab National Accelerator Laboratory – Imperial College London – INFN Lecce – INFN Pisa –
Institute of High Energy Physics, China – Laboratori Nazionali di Frascati, INFN – Nanjing University –
Osaka University – University College London – University of Houston – University of Washington, Seattle
Photo during 2013 experiment.
Internal Information (please ask Peter for password)
Most of the dynamic AlCap information is
organized via this Twiki page. Some pages are public,
some are restricted to the collaboration.