A. Bellerive

Systematic study of trace radioactive impurities in candidate construction materials for EXO-200

The Enriched Xenon Observatory (EXO) will search for double beta decays of 136Xe. We report the results of a systematic study of trace concentrations of radioactive impurities in a wide range of raw materials and finished parts considered for use in the construction of EXO-200, the first stage of the EXO experimental program. Analysis techniques employed, and described here, include direct gamma counting, alpha counting, neutron activation analysis, and high-sensitivity mass spectrometry.

Wavelength shifters for water Cherenkov detectors

The light yield of a water-based Cherenkov detector can be significantly improved by adding a wavelength shifter (WLS). WLS molecules absorb ultraviolet photons and re-emit them at longer wavelengths where typical photomultiplier tubes are more sensitive. In this study, several WLS compounds are tested for possible deployment in the Sudbury Neutrino Observatory (SNO). Test results on optical properties and chemical compatibility for a few WLS candidates are reported; together with timing and gain measurements. A Monte Carlo simulation of the SNO detector response is used to estimate the total light gain with WLS. Finally, a cosmic ray Cherenkov detector was built to investigate the optical properties of WLS.

REVIEW OF SOLAR NEUTRINO EXPERIMENTS

This paper reviews the constraints on the solar neutrino mixing parameters with data collected by the Homestake, SAGE, GALLEX, Kamiokande, SuperKamiokande, and SNO experiments. An emphasis will be given to the global solar neutrino analyses in terms of matter-enhanced oscillation of two active flavors. The results to-date, including both solar model dependent and independent measurements, indicate that electron neutrinos are changing to other active types on route to the Earth from the Sun. The total flux of solar neutrinos is found to be in very good agreement with solar model calculations. Future measurements will focus on greater accuracy for mixing parameters and on better sensitivity to low neutrino energies.

The Sudbury Neutrino Observatory

This review paper provides a summary of the published results of the Sudbury Neutrino Observatory (SNO) experiment that was carried out by an international scientific collaboration with data collected during the period from 1999 to 2006. By using heavy water as a detection medium, the SNO experiment demonstrated clearly that solar electron neutrinos from 8B decay in the solar core change into other active neutrino flavors in transit to Earth. The reaction on deuterium that has equal sensitivity to all active neutrino flavors also provides a very accurate measure of the initial solar flux for comparison with solar models. This review summarizes the results from three phases of solar neutrino detection as well as other physics results obtained from analyses of the SNO data.

Performance of a Full-Size Small-Strip Thin Gap Chamber Prototype for the ATLAS New Small Wheel Muon Upgrade

Author(s): Abusleme, A; Belanger-Champagne, C; Bellerive, A; Benhammou, Y; Botte, J; Cohen, H; Davies, M; Du, Y; Gauthier, L; Koffas, T; Kuleshov, S; Lefebvre, B; Li, C; Lupu, N; Mikenberg, G; Mori, D; Ochoa-Ricoux, JP; Codina, E Perez; Rettie, S; Robichaud-Veronneau, A; Rojas, R; Shoa, M; Smakhtin, V; Stelzer, B; Stelzer-Chilton, O; Toro, A; Torres, H; Ulloa, P; Vachon, B; Vasquez, G; Vdovin, A; Viel, S; Walker, P; Weber, S; Zhu, C | Abstract: The instantaneous luminosity of the Large Hadron Collider at CERN will be increased up to a factor of five with respect to the present design value by undergoing an extensive upgrade program over the coming decade. The most important upgrade project for the ATLAS Muon System is the replacement of the present first station in the forward regions with the so-called New Small Wheels (NSWs). The NSWs will be installed during the LHC long shutdown in 2018/19. Small-Strip Thin Gap Chamber (sTGC) detectors are designed to provide fast trigger and high precision muon tracking under the high luminosity LHC conditions. To validate the design, a full-size prototype sTGC detector of approximately 1.2

Observation of High Momentum {ital {eta}}{sup {prime}} Production in {ital B} Decays

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New Measurement of {ital B} {r_arrow} {ital D}{sup {asterisk}}{ital {pi}} Branching Fractions

1.0\, \mathrm{m}^2

Two-Body {ital B} Meson Decays to {ital {eta}} and {ital {eta}}{sup {ital {prime}}} : Observation of {ital B{r_arrow}{eta}}{sup {ital {prime}}}{ital K}

consisting of four gaps has been constructed. Each gap provides pad, strip and wire readouts. The sTGC intrinsic spatial resolution has been measured in a

Measurement of the {ovr {ital B}} {r_arrow} {ital Dl}{ovr {nu} } Partial Width and Form Factor Parameters

32\, \mathrm{GeV}