No abstract available

[en] Next to the hydrogen atom, the μ^-p system is the most fundamental lepton-hadron system. Hence, it can be used to test and extend basic knowledge of the weak interaction between leptons and quarks. The radiative muon capture (RMC) reaction is much more sensitive to g_P, the induced pseudoscalar coupling constant, than the ordinary muon capture (OMC) reaction because of the much larger range of momentum transfer which can occur in the RMC reaction. A status report and preliminary results from TRIUMF E452, Radiative Muon Capture on Hydrogen, are presented in this paper

[en] A gas scintillation time projection chamber has been constructed and is being tested for use as an active target for TRIUMF experiment 683. The goal of this experiment is to measure the neutrino angular correlations via triton asymmetry following muon capture by polarized muonic ³He. This paper will describe the motivation for this measurement, the design of this detector and preliminary results from the testing of this detector

[en] This article provides the complete description of results from the Phase I data set of the Sudbury Neutrino Observatory (SNO). The Phase I data set is based on a 0.65 kiloton-year exposure of ²H₂O (in the following denoted as D₂O) to the solar ⁸B neutrino flux. Included here are details of the SNO physics and detector model, evaluations of systematic uncertainties, and estimates of backgrounds. Also discussed are SNO's approach to statistical extraction of the signals from the three neutrino reactions (charged current, neutral current, and elastic scattering) and the results of a search for a day-night asymmetry in the ν_e flux. Under the assumption that the ⁸B spectrum is undistorted, the measurements from this phase yield a solar ν_e flux of φ(ν_e)=1.76_-0.05^+0.05(stat.)_-0.09^+0.09(syst.)x10⁶ cm^-2 s^-1 and a non-ν_e component of φ(ν_μτ)=3.41_-0.45^+0.45(stat.)_-0.45^+0.48(syst.)x10⁶ cm^-2 s^-1. The sum of these components provides a total flux in excellent agreement with the predictions of standard solar models. The day-night asymmetry in the ν_e flux is found to be A_e=7.0±4.9(stat.)_-1.2^+1.3%(syst.), when the asymmetry in the total flux is constrained to be zero.

[en] We describe the first measurement of the spin dependence of the reaction: μ^- + ³He → ³H + ν_μ. This spin dependence is quite sensitive to the induced pseudoscalar form factor, F_p, a piece of the weak charged nuclear current of ³He about which, experimentally, relatively little is known. The data are presently being analyzed and we plan to quote a number for F_p shortly. (orig.)

[en] The first measurement of the elementary process μ^-p→ν_μnγ is reported. A photon pair spectrometer was used to measure the partial branching ratio (2.10±0.22)x10^-8 for photons of k>60 MeV. The value of the weak pseudoscalar coupling constant determined from the partial branching ratio is g_p(q²=-0.88m_μ²)=(9.8±0.7±0.3)g_a(0), where the first error is the quadrature sum of statistical and systematic uncertainties and the second error is due to the uncertainty in λ_op, the decay rate of the ortho to para pμp molecule. This value of g_p is ∼1.5 times the prediction of partial conservation of axial current and pion-pole dominance. copyright 1996 The American Physical Society

[en] The photon energy spectrum from the elementary process μ^-p→ν_μnγ was measured using a photon pair-spectrometer at the TRIUMF cyclotron. Various sources of backgrounds are discussed in detail and evaluated. From the final spectrum the partial branching ratio R_γ and the pseudoscalar coupling g_p were extracted. The values obtained are R_γ(k>60 MeV)=(2.10±0.21)x10^-8 and g_p(q²=-0.88m_μ²)=(9.8±0.7±0.3)g_a(0), respectively. The first error is the quadrature sum of statistical and systematic errors, while the second error is due to the uncertainty in λ_op, the transition rate of the pμp molecule from ortho to para states. This measurement of g_p, the most precise to date, agrees with all but one of the previous measurements. However it is 1.46 times the value predicted by the partially conserved axial current hypothesis and pion pole dominance. copyright 1998 The American Physical Society

[en] We report the observation of the elementary process μ^-p→nν_μγ at TRIUMF. copyright 1995 American Institute of Physics

No abstract available

[en] The Sudbury Neutrino Observatory (SNO) is a water imaging Cherenkov detector. Its usage of 1000 metric tons of D₂O as target allows the SNO detector to make a solar-model independent test of the neutrino oscillation hypothesis by simultaneously measuring the solar ν_e flux and the total flux of all active neutrino species. Solar neutrinos from the decay of ⁸B have been detected at SNO by the charged-current (CC) interaction on the deuteron and by the elastic scattering (ES) of electrons. While the CC reaction is sensitive exclusively to ν_e, the ES reaction also has a small sensitivity to ν_μ and ν_τ. In this paper, recent solar neutrino results from the SNO experiment are presented. It is demonstrated that the solar flux from ⁸B decay as measured from the ES reaction rate under the no-oscillation assumption is consistent with the high precision ES measurement by the Super-Kamiokande experiment. The ν_e flux deduced from the CC reaction rate in SNO differs from the Super-Kamiokande ES results by 3.3σ. This is evidence for an active neutrino component, in additional to ν_e, in the solar neutrino flux. These results also allow the first experimental determination of the total active ⁸B neutrino flux from the Sun, and is found to be in good agreement with solar model predictions