Welcome

• Philippe Di Stefano

Welcome

Double Beta Decay with double-readout bolometers

• Stefano Pirro (INFN)

The key-features of the Heat+Scintillation light detection in the case of Double Beta Decay searches with bolometers will be presented. The new results obtained in the optimization of the ibryd detectors will be presented. Outline for the future tests will be discussed.

Work at PSI

• Johann Gironnet (IAS/PSI)

We dexcrive the status of our work at PSI.

To be announced

• Irina Bavykina

TBA

Cryogenic Light Detectors with Neganov-Luke Amplification

• Christian Isaila (TU Muenchen)

Cryogenic Light Detectors with Neganov-Luke Amplification

Monte-Carlo simulations of heavy inorganic scintillators

• David Wahl (Universidad Nacional de Ingeniería, Lima, Perú)

Cryogenic scintillator experiments are typically difficult to optimise by trial and error due to the difficulty of performing repetitive experiments at low temperatures. Monte-Carlo simulations are therefore an attractive option for optimising the light collection from cryogenic scintillators. The talk presents two of the most commonly used packages for the simulation of scintillators: Geant4 and Litrani. A difficulty in performing simulations is determining the input parameters such as the bulk properties (the intrinsic light yield, the scattering and absorption coefficients) and the surface properties. The MCRIM technique for determining the bulk properties is presented as well as AFM measurements of CaWO4 crystals in order to estimate surface properties. Results of simulations with CaWO4 are presented and compared with some published results.

SciCryo update

• Philippe Di Stefano

Extension of the multi-photon counting technique for scintillator characterisation in the milli-kelvin temperature range

• Vitalii Mikhailik (Univ of Oxford)

The multi-photon counting technique (NIMA, 553 (2005) 522) was essentially modified to investigate scintillation characteristics of crystals at milli-Kelvin temperatures using a 3He/4He dilution refrigerator. The temperature dependence of the scintillation decay time and light yield of CaWO4 were measured down to 20 mK for the first time. The scintillation light yield is found to be invariant below 10 K – a tenet crucial to a decade of cryogenic scintillator experiments, yet previously unproved. The temperature change of the decay kinetic of CaWO4 is analysed in terms of a simple three-level model of the emission centre. The model agrees well with the data over the temperature range (0.02-350 K) investigated, and is used to determine the parameters of the relaxed excited state.

Report on the status of the ROSEBUD experiment

• Lidia Torres

The ROSEBUD experiment has resumed its activity in the Laboratorio Subterráneo de Canfranc (LSC). A multi-target arrangement including three different scintillating bolometers, i.e. undoped sapphire (50 g), BGO (46 g) and LiF (33 g) has been mounted. We report on the discrimination of electronic vs. nuclear recoils achieved with each bolometer, as well as on the preliminary results on sensitivity.

Czochralski Growth of CaWO4 Crystals for the CRESST experiment

• Christian Ciemniak (TU Muenchen)

Czochralski Growth of CaWO4 Crystals for the CRESST experiment

Discussion