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...
Diffusion of muonic hydrogen in hydrogen gas and the measurement of the 1s hype...
Nuber, Jonas; Adamczak, A.; Abdou Ahmed, M.; Affolter, L.; Amaro, F. D.; Amaro, Pedro; Antognini, A.; Carvalho, P.; Chang, Y. -H.; Chen, T. -L.The CREMA collaboration is pursuing a measurement of the ground-state hyperfine splitting (HFS) in muonic hydrogen (μp) with 1 ppm accuracy by means of pulsed laser spectroscopy. In the proposed experiment, the μp atom is excited by a laser pulse from the singlet to the triplet hyperfine sub-levels, and is quenched back to the singlet state by an inelastic collision with a H2 molecule. The resulting increase of...
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...
The CYGNO experiment, a directional detector for direct Dark Matter searches
Amaro, F. D.; Baracchini, E.; Benussi, L.; Bianco, S.; Capoccia, C.; Caponero, M.; Cardoso, D. S.; Cavoto, G.; Cortez, A.; Costa, I. A.; Dané, E.The CYGNO project aims at the development of a high precision optical readout gaseous Tima Projection Chamber (TPC) for directional dark matter (DM) searches, to be hosted at Laboratori Nazionali del Gran Sasso (LNGS). CYGNO employs a He:CF$_4$ gas mixture at atmospheric pressure with a Gas Electron Multiplier (GEM) based amplification structure coupled to an optical readout comprised of sCMOS cameras and photo...
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...
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...
Neutral Bremsstrahlung Emission in Xenon Unveiled
Henriques, C. A. O.; Amedo, P.; Teixeira, J. M. R.; González-Díaz, D.; Azevedo, C. D. R.; Para, A.; Martín-Albo, J; Hernandez, A. SaaPOPULAR SUMMARY When ionizing radiation interacts with xenon, copious amounts of ultraviolet light are emitted at particular wavelengths—an “electroluminescence” that is leveraged in dark matter searches and neutrino detectors. But researchers were not aware of the presence of another, fainter, light emission over a broader wavelength range, from the ultraviolet to the near infrared. Therefore, scientists expla...
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...
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...