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Financement de l’UE (9 373 587 €) : A background-free experiment to discover the nature of neutrinos based on single Barium Atom Light Detection Hor26/02/2021 Programme de recherche et d'innovation de l'UE « Horizon »
Texte
A background-free experiment to discover the nature of neutrinos based on single Barium Atom Light Detection
Searching for neutrinoless double beta decays (NLDBD) is the only practical way to establish if the neutrinos are their own antiparticles, a discovery of enormous importance for particle physics and cosmology. Due to the smallness of neutrino masses, the lifetime of NLDBD is expected to be much longer than the ones from the noise associated with the natural radioactive chains. A positive identification of NLDBD decays requires finding a signal that cannot be mimicked by radioactive backgrounds. In particular, the NLDBD decay of Xe-136 could be established by detecting the doubly ionized daughter atom, Ba2+ created in the decay. Such a detection could be achieved via a sensor made of a monolayer of molecular indicators. The Ba2+ would be captured by one of the molecules in the sensor, and the presence of the single Ba2+-complexed indicator would be subsequently revealed by a fluorescent response after interrogation with a laser system. Our proposed sensor is based on a new type of molecular bicolor fluorescent indicators, able to shift their emission spectra when complexed with Ba2+. The interrogation and detection system will be based in fast, two photon absorption microscopy. The primary goals of this proposal are: 1, a full demonstration of the feasibility of a sensor capable of detecting single Ba2+ ions in a High Pressure Xenon Chamber (HPXe), and 2) the construction of a large HPXe demonstrator, the BOLD detector, which will implement a full Barium Tagging Detector System and will demonstrate the feasibility of building a background-free experiment at the ton-scale, with large discovery potential.
| Asociacion de Investigacion MPC - Materials Physics Center | 125 000 € |
| BEN-GURION UNIVERSITY OF THE NEGEV | 400 000 € |
| Fundacion Donostia International Physics Center | 3 224 375 € |
| HARVARD GLOBAL RESEARCH AND SUPPORT SERVICES Inc. | 644 500 € |
| PRESIDENT AND FELLOWS OF HARVARD COLLEGE | 0,00 € |
| The University of Manchester | 2 105 500 € |
| Universidad del Pais Vasco/ Euskal Herriko Unibertsitatea | 2 424 212 € |
| Universitat de Valencia | 150 000 € |
| Universitat Politecnica de Valencia | 300 000 € |
https://cordis.europa.eu/project/id/951281
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