27 documents found, page 1 of 3
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...
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...
Effects of functional oils on the growth, carcass and meat characteristics, and...
Ferket, P. R.; Malheiros, R. D.; Moraes, V. M. B. [UNESP]; Ayoola, A. A.; Barasch, I; Toomer, O. T.; Torrent, J.Made available in DSpace on 2020-12-11T21:11:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-07-01; Oligo Basics USA, LLC (Cary, NC); North Carolina Agricultural Foundation, Inc. (Raleigh, NC); USDA-NIFA Project; Two experiments were conducted to evaluate the effects of functional oils containing cashew nutshell and castor oil on turkey performance and intestinal morphology. In experiment 1, 585 hatch...
Crop use and profile distribution of phosphorus in soils that developed on mafi...
Monteiro, M.C.H.; Monteiro, Fernando; Madeira, Manuel; Torrent, J.The phytoavailability of soil phosphorus (P) depends on the different forms in which it occurs and how these forms change after the application of P fertiliser to the soil. Forms of P in the A, B and C horizons of eleven pedons that developed on mafic rocks were characterised by a fractionation method before and after fertilisation with single superphosphate, and a micropot experiment was conducted to assess th...
Quantificação de óxidos de ferro de Latossolos brasileiros por espectroscopia d...
Fernandes, R. B. A.; Barrón, V.; Torrent, J.; Fontes, M. P. F.A cor é um dos principais atributos considerados na classificação dos solos, indicando a riqueza em matéria orgânica e a natureza mineralógica dos óxidos de ferro presentes. Este trabalho teve por objetivo avaliar a capacidade preditiva da cor do solo, determinada pela técnica de refletância difusa, na quantificação dos óxidos de Fe hematita e goethita em diferentes Latossolos brasileiros. Os espectros de refle...
Organic amendments as a source of phosphorus: agronomic and environmental impac...
Monteiro, M.C.H.; Roboredo, Marta; Carneiro, J.P.; Duarte, A.C.; Torrent, J.; Sharpley, AndrewPhosphorus (P) is a non-renewable resource highlighting the significance of developing and using alternative P sources for a sustainable agriculture. The work aims to compare the effects of different organic amendments (OA) and a mineral P fertiliser as reference on P use efficiency by the crop, and on P losses to runoff waters and eroded sediments. A two-year field trial was conducted in a Dystric Regosol with...
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.