Ba+2 ion trapping using organic submonolayer for ultra-low background neutrinoless double beta detector

P. Herrero-Gómez, J. P. Calupitan, M. Ilyn, A. Berdonces-Layunta, T. Wang, D. G. Oteyza, M. Corso, R. González-Moreno, I. Rivilla, B. Aparicio, A. I. Aranburu, Z. Freixa, F. Monrabal, F. P. Cossío, J. J. Gómez-Cadenas and C. Rogero ()
Additional contact information
P. Herrero-Gómez: Centro de Física de Materiales (CSIC-UPV/EHU)
J. P. Calupitan: Centro de Física de Materiales (CSIC-UPV/EHU)
M. Ilyn: Centro de Física de Materiales (CSIC-UPV/EHU)
A. Berdonces-Layunta: Centro de Física de Materiales (CSIC-UPV/EHU)
T. Wang: Centro de Física de Materiales (CSIC-UPV/EHU)
D. G. Oteyza: Centro de Física de Materiales (CSIC-UPV/EHU)
M. Corso: Centro de Física de Materiales (CSIC-UPV/EHU)
R. González-Moreno: Centro de Física de Materiales (CSIC-UPV/EHU)
I. Rivilla: Donostia International Physics Center (DIPC)
B. Aparicio: Centro de Innovación en Química Avanzada (ORFEO-CINQA), University of the Basque Country (UPV/EHU)
A. I. Aranburu: University of the Basque Country (UPV/EHU)
Z. Freixa: Ikerbasque, Basque Foundation for Science
F. Monrabal: Donostia International Physics Center (DIPC)
F. P. Cossío: Donostia International Physics Center (DIPC)
J. J. Gómez-Cadenas: Donostia International Physics Center (DIPC)
C. Rogero: Centro de Física de Materiales (CSIC-UPV/EHU)

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract If neutrinos are their own antiparticles the otherwise-forbidden nuclear reaction known as neutrinoless double beta decay can occur. The very long lifetime expected for these exceptional events makes its detection a daunting task. In order to conduct an almost background-free experiment, the NEXT collaboration is investigating novel synthetic molecular sensors that may capture the Ba dication produced in the decay of certain Xe isotopes in a high-pressure gas experiment. The use of such molecular detectors immobilized on surfaces must be explored in the ultra-dry environment of a xenon gas chamber. Here, using a combination of highly sensitive surface science techniques in ultra-high vacuum, we demonstrate the possibility of employing the so-called Fluorescent Bicolor Indicator as the molecular component of the sensor. We unravel the ion capture process for these molecular indicators immobilized on a surface and explain the origin of the emission fluorescence shift associated to the ion trapping.

Date: 2022
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DOI: 10.1038/s41467-022-35153-0

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