6 documents found, page 1 of 1
Demonstration of neutrinoless double beta decay searches in gaseous xenon with ...
Fernandes, L. M. P.; Freitas, E. D. C.; Henriques, C. A. O.; Mano, R.D.P.; Monteiro, C. M. B.; Santos, J. M. F. dos; Teixeira, J. M. R.The NEXT experiment aims at the sensitive search of the neutrinoless double beta decay in $^{136}$Xe, using high-pressure gas electroluminescent time projection chambers. The NEXT-White detector is the first radiopure demonstrator of this technology, operated in the Laboratorio Subterr\'aneo de Canfranc. Achieving an energy resolution of 1% FWHM at 2.6 MeV and further background rejection by means of the topolo...
NEXT-CRAB-0: a high pressure gaseous xenon time projection chamber with a direc...
Borges, F. I. G. M.; Conde, C. A. N.; Escada, J.; Fernandes, L. M. P.; Freitas, E. D. C.; Henriques, C. A. O.; Mano, R.D.P.; Marques, A. P.The search for neutrinoless double beta decay (0) remains one of the most compelling experimental avenues for the discovery in the neutrino sector. Electroluminescent gas-phase time projection chambers are well suited to 0 searches due to their intrinsically precise energy resolution and topological event identification capabilities. Scalability to ton- and multi-ton masses requires readout of large-area electr...
Sensitivity of the NEXT experiment to Xe-124 double electron capture
Fernandes, A. F. M.; Fernandes, L. M. P.; Henriques, C. A. O.; Freitas, E. D. C.; Mano, R.D.P.; Monteiro, C. M. B.; Santos, J. M. F. dos; Santos, F. P.Double electron capture by proton-rich nuclei is a second-order nuclear process analogous to double beta decay. Despite their similarities, the decay signature is quite different, potentially providing a new channel to measure the hypothesized neutrinoless mode of these decays. The Standard-Model-allowed two-neutrino double electron capture (2 ECEC) has been predicted for a number of isotopes, but only observed...
Demonstration of background rejection using deep convolutional neural networks ...
Borges, F. I. G. M.; Conde, C. A. N.; Fernandes, A. F. M.; Fernandes, L. M. P.; Freitas, E. D. C.; Henriques, C. A. O.; Escada, J.; Mano, R.D.P.Convolutional neural networks (CNNs) are widely used state-of-the-art computer vision tools that are becoming increasingly popular in high-energy physics. In this paper, we attempt to understand the potential of CNNs for event classification in the NEXT experiment, which will search for neutrinoless double-beta decay in 136Xe. To do so, we demonstrate the usage of CNNs for the identification of electron-positro...
Electroluminescence TPCs at the thermal diffusion limit
Henriques, C. A. O.; Monteiro, C. M. B.; Freitas, E. D. C.; Mano, R.D.P.; Jorge, M R; Fernandes, A. F. M.; Fernandes, L. M. P.; Santos, F. P.The NEXT experiment aims at searching for the hypothetical neutrinoless double-beta decay from the 136Xe isotope using a high-purity xenon TPC. Efficient discrimination of the events through pattern recognition of the topology of primary ionisation tracks is a major requirement for the experiment. However, it is limited by the diffusion of electrons. It is known that the addition of a small fraction of a molecu...
Sensitivity of NEXT-100 to neutrinoless double beta decay
NEXT Collaboration; Martín-Albo, J.; Vidal, J. Muñoz; Ferrario, P.; Nebot-Guinot, M.; Gomez-Cadenas, J. J.; Álvarez, V.; Azevedo, C. D. R.