Archive of seminars
M. Loidl (LNHB, Сакле, Франция)
The Laboratoire National Henri Becquerel is the French national laboratory for ionizing radiation metrology.In this context we are developing cryogenic detectors, principally for the determination of nuclear and atomic data,but we also contribute to a project aiming at the research of neutrinoless double beta decay.
In the first part of the seminar the operating principle and some details on the design of these detectors, metallic magnetic calorimeters (MMCs) developed in part in collaboration with the university of Heidelberg, will be presented.
The second part will be dedicated to the application of MMCs for nuclear and atomic data determination. We are working on the measurement of the precise shapes of beta spectra as well as on the measurement of X-ray emission intensities with high energy resolution. In terms of physics, we could demonstrate the importance of the atomic exchange effect in beta spectra at very low energy as well as the presence of intense, unknown satellite lines in the L X-ray spectra of several nuclides of heavy elements.
In the third part the possible utilization of MMCs in the project LUMINEU aiming at the research of neutrinoless double beta decay with scintillating bolometers will be outlined. The main motivation for this development is the relatively fast response of MMCs compared with NTD germanium thermistors which are the baseline solution for the readout of these bolometers. This can help to reduce the pile-up of two-neutrino double beta decay events which may be the main source of background in a future large scale version of this experiment. First results of a light detector read out by MMCs will be presented as well as the concept of integrated light-and-heat detectors and ideas for the application of similar concepts in dark matter search.