# ICHEP 2016 Chicago

3-10 August 2016
Chicago IL USA
US/Central timezone
There is a live webcast for this event.

## Normalization system for the Mu2e Experiment - The Stopping-Target Monitor

Aug 6, 2016, 6:00 PM
2h
Riverwalk A/B

### Riverwalk A/B

Poster Detector: R&D and Performance

### Description

The Mu2e experiment, a search for Charged-Lepton Flavor Violation (CLFV), aims to measure the rate of neutrinoless muon-to-electron conversion in the coulomb field of an aluminum nucleus, $R_{\mu e} = \Gamma(\mu\mathrm{Al} \to e\mathrm{Al}) / \Gamma_{\mathrm{capture}}(\mu\mathrm{Al})$. If CLFV is not observed, we will improve the current limit by a factor 10,000. In order to reach our goal, we must measure the denominator of $R_{\mu e}$ to about the 10% level. In Mu2e, muons will be stopped in a series of thin aluminum foils known as the Muon Stopping Target. As muons are captured in excited energy levels of aluminum atoms they promptly cascade down to the $1s$ state emitting characteristic X-rays. Captured muons also produce excited nuclei which emit gamma-rays with known energies and intensities. One sub-system of the Mu2e experiment, the Stopping-Target Monitor, will measure the X- and gamma-rays using a high-purity germanium detector. To overcome the extremely high background rates and avoid severe radiation damage we place the detector far downstream of the Muon Stopping Target, employ a dipole magnet to sweep away charged particles, a series of collimators to ensure the detector only views the Muon Stopping Target, and shielding from background radiation. We present a detailed description of the sub-system design, simulation results, and the normalization measurement technique.