14 documents found, page 1 of 2
Reflectance and fluorescence characteristics of PTFE coated with TPB at visible...
Haefner, J.; Fahs, A.; Ho, J.; Stanford, C.; Guenette, R.; Adams, C.; Almazán, H.; Álvarez, V.; Aparicio, B.; Aranburu, A.I.; Arazi, L.; Arnquist, I.J.Polytetrafluoroethylene (PTFE) is an excellent diffuse reflector widely used in light collection systems for particle physics experiments. In noble element systems, it is often coated with tetraphenyl butadiene (TPB) to allow detection of vacuum ultraviolet scintillation light. In this work this dependence is investigated for PTFE coated with TPB in air for light of wavelengths of 200 nm, 260 nm, and 450 nm. Th...
A compact dication source for Ba2+ tagging and heavy metal ion sensor development
Navarro, K.E.; Baeza-Rubio, J.; Boyd, M.; Foss, F.W.; Giri, S.; Jones, B.J.P.; Miller, R.L.; Nygren, D.R.; Samaniego, F.J.; Stogsdill, K.We present a tunable metal ion beam that delivers controllable ion currents in the picoamp range for testing of dry-phase ion sensors. Ion beams are formed by sequential atomic evaporation and single or multiple electron impact ionization, followed by acceleration into a sensing region. Controllability of the ionic charge state is achieved through tuning of electrode potentials that influence the retention time...
Sensitivity of a tonne-scale NEXT detector for neutrinoless double-beta decay s...
Adams, C.; Álvarez, V; Arazi, L.; Arnquist, I. J.; Azevedo, C. D. R; Bailey, K.; Ballester, F.; Benlloch-Rodríguez, J. M.; Borges, F. I. G. M.The Neutrino Experiment with a Xenon TPC (NEXT) searches for the neutrinoless double-beta (0 ) decay of 136Xe using high-pressure xenon gas TPCs with electroluminescent amplification. A scaled-up version of this technology with about 1 tonne of enriched xenon could reach in less than 5 years of operation a sensitivity to the half-life of 0 decay better than 1027 years, improving the current limits by at least o...
Boosting background suppression in the NEXT experiment through Richardson-Lucy ...
Simón, A.; Ifergan, Y.; Redwine, A. B.; Weiss-Babai, R.; Arazi, L.; Adams, C.; Almazán, H.; Álvarez, V.; Aparicio, B.; Aranburu, A. I.; Arnquist, I. J.Submitted to JHEP; Next-generation neutrinoless double beta decay experiments aim for half-life sensitivities of ~$10^{27}$ yr, requiring suppressing backgrounds to <1 count/tonne/yr. For this, any extra background rejection handle, beyond excellent energy resolution and the use of extremely radiopure materials, is of utmost importance. The NEXT experiment exploits differences in the spatial ionization patterns...
A lead isotope database for copper mineralization along the Guadalquivir River ...
Sáez, R.; Nocete, F.; Gil Ibarguchi, J. I.; Rodríguez-Bayona, M.; Inácio, Nuno; Quispe, D.; Rodríguez, J.; Zalduegui, J. F. SantosThe Guadalquivir River Valley constitutes the main geographic environment for the earliest development of political structures in the South of the Iberian Peninsula. The inception of Cu-metallurgy over the millennia 4th to 2nd BC in this region coincides with the rise of social complexity as well as the strategic control of the territory based on the command of the supply of mineral resources. One of the main t...
Low-diffusion Xe-He gas mixtures for rare-event detection: electroluminescence ...
Fernandes, A. F. M.; Henriques, C. A. O.; Mano, R.D.P.; González-Díaz, D.; Azevedo, C. D. R; Silva, P. A. O. C.; Gomez-Cadenas, J. J.; Freitas, E. D. C.High pressure xenon Time Projection Chambers (TPC) based on secondary scintillation (electroluminescence) signal amplification are being proposed for rare event detection such as directional dark matter, double electron capture and double beta decay detection. The discrimination of the rare event through the topological signature of primary ionisation trails is a major asset for this type of TPC when compared t...
Estudio experimental y numérico de una pared solar en clima templado
Vitale, G.; Rodríguez, J.; Berges, I.; Bove, I.; Larsen, S. FloresRESUMEN: Las paredes solares se utilizan desde épocas remotas y en lugares donde el clima presenta una considerable amplitud térmica. Hoy se utilizan incluso para ventilación en veranos de climas templados. Sin embargo, hay pocos estudios sobre el uso de esta tecnología en climas templados o húmedos. En este trabajo se realiza un estudio experimental y numérico de un cuarto de ensayo en Uruguay con un muro acum...
Homogeneização do fluxo em concentradores solares de elevada intensidade
Pereira, J.C.G.; Fernandes, Jorge Cruz; Rodríguez, J.; Rosa, Luís GuerraRESUMO: Quer as medições experimentais realizadas com radiómetros, quer as simulações ópticas já efectuadas, evidenciam a dificuldade de obtenção de fluxos homogéneos de radiação solar, nos atuais fornos solares de elevada concentração. Apesar de se recorrer a dispositivos ópticos denominados homogeneizadores do fluxo da radiação, os atuais fornos solares não conseguem contornar satisfatoriamente este problema....
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.
Radiopurity assessment of the tracking readout for the NEXT double beta decay e...
Cebrián, S.; Pérez, J.; Bandac, I.; Labarga, L.; Álvarez, V.; Barrado, A. I.; Bettini, A.; Borges, F. I. G. M.; Camargo, M.; Cárcel, S.; Cervera, A.