223 research outputs found
Nuclear tracks from Cold Dark Matter interactions in mineral crystals: a computational study
No full textSurface sputtering from cold dark matter interactions: proposed search for its diurnal modulation
No full textThe experimental challenge of detecting solar axion-like particles to test the cosmological ALP-photon oscillation hypotheses
No full textCoherent Neutral Current Neutrino-Nucleus Scattering at a Spallation Source: a Valuable Experimental Probe
No full textThe coherent contribution of all neutrons in neutrino nucleus scattering due to the neutral current is examined considering the Spallation Neutron Source (SNS) as a source of neutrinos. SNS is a prolific pulsed source of electron and muon neutrinos as well as muon antineutrinos.The coherent contribution of all neutrons in neutrino nucleus scattering due to the neutral current is examined considering the Spallation Neutron Source (SNS) as a source of neutrinos. SNS is a prolific pulsed source of electron and muon neutrinos as well as muon antineutrinos
Can large scintillators be used for solar-axion searches to test the cosmological axion–photon oscillation proposal?
No full textAbstractSolar-axion interaction rates in NaI, CsI and Xe scintillators via the axio-electric effect were calculated. A table is presented with photo-electric and axio-electric cross sections, solar-axion fluxes, and the interaction rates from 2.0 to 10.0 keV. The results imply that annual-modulation data of large NaI and CsI arrays, and large Xe scintillation detectors, might be made sensitive enough to probe coupling to photons at levels required to explain axion–photon oscillation phenomena proposed to explain the survival of high-energy photons traveling cosmological distances. The DAMA/LIBRA data are used to demonstrate the power of the model-independent annual modulation due to the seasonal variation in the earth-sun distance
CAST constraints on the axion-electron coupling
No full textIn non-hadronic axion models, which have a tree-level axion-electron interaction, the Sun produces a strong axion flux by bremsstrahlung, Compton scattering, and axiorecombination, the "BCA processes." Based on a new calculation of this flux, including for the first time axio-recombination, we derive limits on the axion-electron Yukawa coupling gae and axion-photon interaction strength ga using the CAST phase-I data (vacuum phase). For ma <~ 10 meV/c2 we find ga gae < 8.1 × 10−23 GeV−1 at 95% CL. We stress that a next-generation axion helioscope such as the proposed IAXO could push this sensitivity into a range beyond stellar energy-loss limits and test the hypothesis that white-dwarf cooling is dominated by axion emission
Search for the double beta decay of Zr-96 with NEMO-3 and calorimeter development for the SuperNEMO experiment
No full textUsing 9.4 g of Zr-96 and 1221 days of data from the NEMO-3 detector corresponding to 0.031 kgy, the obtained 2vbb decay half-life measurement is [2.35 \pm 0.14(stat) \pm 0.16(syst)] \times 10_{19}yr. Different characteristics of the final state electrons have been studied, such as the energy sum, individual electron energy, and angular distribution. The 2v nuclear matrix element is extracted using the measured 2vbb half-life and is 0.049 \pm 0.002. The 0vbb decay half-life is excluded at the 90% CL to > 9.2 \times 10_^{21}yr corresponding to a limit on the effective Majorana neutrino mass of < 7.2 – 19.4 eV. Limits on other mechanisms of 0vbb have also been set.
Due for commissioning in 2012, SuperNEMO is the next generation detector which improves upon the proven technology and success of NEMO-3 to achieve a half-life sensitivity of ~10_{26} yr (90% CL) for Se-82 which corresponds to a neutrino mass of 50-100 meV. An energy resolution of 7% FWHM at 1 MeV has been obtained for the calorimeter baseline design of SuperNEMO which is currently in the R&D phase. This result not only meets the requirement stipulated by the R&D proposal, but is unprecedented for this type of calorimeter design
Tra Genova e Avignone: un Giudizio Finale per Opicino de Canistris
No full textThe essay examines an episode narrated by the Pavia cleric Opicino de Canistris in his autobiography, which is part of the manuscript Pal. Lat. 1993 in the Vatican Apostolic Library. During his stay in Genoa between 1316 and 1318, he had a terrible dream about the Last Judgement. It is hypothesised that this dream, like another one that the author recounts later, during his stay in Avignon, transfigures the experience of seeing a work of art that was particularly compelling for its spiritual meanings and its “public” significance
IAXO-the future axion helioscope
No full textCAST Experiment;CERN;DESY;et al.;PRISMA Cluster of Excellence at the Johannes Gutenberg University Mainz;University of HeidelbergInternational Axion Observatory (IAXO) is a new generation axion helioscope aiming to search for axions and axion-like particles with a sensitivity to the axion-photon coupling that is 1 to 1.5 orders of magnitude beyond the one achieved by currently the most sensitive axion helioscope, CAST. IAXO relies on large improvements in magnetic field volume, X-ray focusing optics and detector backgrounds with respect to CAST. Additional IAXO searches would include electron-coupled axions, relic axions, and other more generic axion-like particles. © 2013 Proceedings of the 9th Patras Workshop on Axions, WIMPs and WISPs, PATRAS 2013. All rights reserved.098-0982887-2872We acknowledge support from MSES (Croatia) under grant no. 098-0982887-2872
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