PhD Thesis defense: Development of sensors for individual barium ion identification in the context of the NEXT experiment

PhD Program

Speaker

by Pablo Herrero Gómez

When

2023/06/23
11:00

Place

CFM auditorium, Donostia / San Sebastián

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Supervisors: Celia Rogero Blanco (CFM, DIPC) and Francesc Monrabal Capilla (DIPC, Ikerbasque)

This thesis encompasses the first steps in the development of a chemo-sensor for individual Barium dication detection to be implemented in the NEXT experiment. The sensor works by converting chemical properties of the ion into a detectable optical signal. Using fluorescent chemo-sensors may be a unique tool in the field of neutrino physics. The NEXT experiment searches for the neutrinoless double beta decay of Xe-136. In this reaction two electrons and the Ba++ dication are produced. Detecting the Ba ion in delayed coincidence with the two electrons would make the NEXT experiment background free. This required adapting fluorescence chemo-sensors to the ultra-dry environment of NEXT. The sensor is built by immobilising fluorescent molecules on an appropriate surface which preserves its photochemical properties. To this end, atomically-precise molecular deposition and characterization techniques were used. Additionally, a fluorescence microscope has been developed to meet these conditions and requirements.