6051555
Absorption of scintillation light in a 100 l liquid xenon γ-ray detector and expected detector performance
Abstract An 800 l liquid xenon scintillation γ -ray detector is being developed for the MEG experiment which will search for μ + → e + γ  decay at the Paul Scherrer Institut. Absorption of scintillation light of xenon by impurities might possibly limit the performance of such a detector. We used a 100 l prototype with an active volume of 372 × 372 × 496 mm 3 to study the scintillation light absorption. We have developed a method to evaluate the light absorption, separately from elastic scattering of light, by measuring cosmic rays and α sources. By using a suitable purification technique, an absorption length longer than 100 cm has been achieved. The effects of the light absorption on the energy resolution are estimated by Monte Carlo simulation.
190503738
Studio di fattibilita' della misura dell'angolo gamma del triangolo di unitarieta' a CDF
117188598
The MEG experiment at PSI: status and prospects
The present status of the MEG experiment at PST is reviewed. This experiment aims at measuring the branching ratio of the lepton flavor violating process μ+ → e+γ with a sensitivity two orders of magnitude below the present experimental limit, set to 1.2 × 10 −11 by the MEGA experiment. The positron momentum will be measured by a set of drift chambers inside a non‐homogeneous magnetic field while the photon four‐momentum will be measured by an innovative homogeneous liquid xenon scintillation calorimeter. The experiment is now in an advanced construction stage and it is scheduled to start engineering runs during the year 2006.
120834757
A cryogenic facility for testing the PMTs of the MEG liquid xenon calorimeter
We built and operated a cryogenic facility for testing in liquid xenon the photomultipliers (PMTs) to be used in the electromagnetic calorimeter of the MEG experiment. In this paper we describe the working principle of the facility and we report on the characteristics measured for some PMTs.
122842980
The MEG experiment at PSI: status and prospects
The present status of the MEG experiment, an experiment to search for the μ+ → e+ + γ decay at PSI, is described. The experiment will utilize an innovative liquid xenon calorimeter in which only the information provided by the scintillation light is used for the photon energy reconstruction. A major emphasis is given to the recently measured transparency characteristics of the liquid xenon.
62890385
Frequentist analyses of solar neutrino data
The solar neutrino data are analysed in a frequentist framework, using the Crow-Gardner and Feldman-Cousins prescriptions for the construction of confidence regions. Including in the fit only the total rates measured by the various experiments, both methods give results similar to the commonly used Δχ2-cut approximation. When fitting the full data set, the Δχ2-cut still gives a good approximation of the Feldman-Cousins regions. However, a careful statistical analysis significantly reduces the goodness-of-fit of the SMA and LOW solutions.
119072823
Absence of Definite Scaling Laws in Raman Scattering from Fractals
The frequency dependence of the Raman coupling coefficient $C(\omega)$ is calculated numerically for square and cubic percolation clusters. No general scaling law in terms of the macroscopic parameters such as the fractal dimension $D$ or the spectral dimension $\overline d$ is found. $C(\omega)$ is sensitive to the microscopic structure of the clusters and depends on: site- or bond-percolation, presence or absence of dangling bonds, scattering mechanism and polarization, presence or absence of polarizability disorder. This situation makes the derivation of macroscopic parameters from Raman experiments unreliable.