# 18th International Workshop on Low Temperature Detectors (LTD-18)

Jul 22 – 26, 2019
Milano
Europe/Rome timezone

## Development of MMC based combined photon and phonon detector for rare event searches

Jul 23, 2019, 5:45 PM
1h 15m
Piazza Città di Lombardia (Milano)

### Piazza Città di Lombardia

#### Milano

Piazza Città di Lombardia, 1, 20124 Milano MI
Poster Low Temperature Detector fabrication techniques and materials

### Speaker

Andreas Fleischmann (Kirchhoff Institute for Physics, Heidelberg University)

### Description

In the search for rare events, a simultaneous measurement of photons and phonons produced after an event in a scintillating crystal operated at mK temperatures enables an efficient background rejection. This is due to the fact that the light yield depends on the mass, allowing for particle discrimination. This approach can be used for both neutrinoless double beta decay and dark matter searches. We present the design of a combined photon and phonon detector based on metallic magnetic calorimeters (MMCs). Simulations predict an energy resolution of $\Delta E_{\mathrm{FWHM}}\,<\,10\,$eV, a signal risetime of $\tau_0\,<\,50\,\mu$s and a signal decay time $\tau_1\,<\,10\,$ms for the photon detector and $\Delta E_{\mathrm{FWHM}}\,<\,100\,$eV, $\tau_0\,<\,200\,\mu$s and $\tau_1\,<\,10\,$ms for the phonon detector. The combined photon and phonon detector concept will be described with emphasis on the tower design of a multi-crystal setup. The challenges of the fabrication steps will be discussed. In addition, we will present the results of characterizations of first prototypes of such photon and phonon detectors.

Student (Ph.D., M.Sc. or B.Sc.) N N

### Primary author

Andreas Fleischmann (Kirchhoff Institute for Physics, Heidelberg University)

### Co-authors

Felix Ahrens (Kirchhoff Institute for Physics, Heidelberg University) Christian Enss (Kirchhoff Institute for Physics, Heidelberg University) Freerik Forndran (Kirchhoff Institute for Physics, Heidelberg University) Loredana Gastaldo (Kirchhoff Institute for Physics, Heidelberg University) Sebastian Kempf (Kirchhoff Institute for Physics, Heidelberg University) Daniel Unger (Kirchhoff Institute for Physics, Heidelberg University) Clemens Velte (Kirchhoff Institute for Physics, Heidelberg University)

### Presentation materials

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