[en] A review of results from Adone is given. Topics covered are: a) limits on e*→eγ; b)R values; c) multiplicities and G parities; d) partial cross sections

[en] A short review of recent experimental results obtained at Adone, on multihadronic e⁺e^- annihilation is given. Results and comments concern: (1) R values, compared QCD and EVMD predictions; (2) charged and neutral multiplicities, threshold for energy crisis, G parities and SU-3 checks; (3) sigma(2π⁺, 2π^-) - evidence for a large p''(1600); (4) sigma(π⁺π^-2π⁰) - lack of evidence for a p'(1250); (5) sigma(2π⁺, 2π^-, nπ⁰) - possible interpretation of the 1.82 GeV structure

[en] The experimental problem of the calibration of magnetic field in large iron detectors located in underground areas is discussed. Emphasis is laid on techniques based on ballistic measurements as the ones employed by MINOS or OPERA. An experimental investigation of the precision achievable by these methods has been carried out using a full-scale prototype of the OPERA spectrometer built in Frascati in 2001. We demonstrate that a field calibration at the level of 3% can be reached and discuss in details the limiting systematics. Moreover, we provide analytical formulas to model the behaviour of the apparatus in the transient regime, keeping into account eddy current effects and the finite penetration velocity of the driving fields. These formulas ease substantially the design of the calibration apparatus. Finally, ballistic techniques are shown to match the requirements for field calibration at the next generation long-baseline neutrino experiments and are well-suited to operate in underground laboratories

[en] It is here presented updated results of the measurement of the atmospheric neutrino flux with the Macro detector at Gran Sasso, using three data sets spread in a large energy range. In the high energy range, the upgoing throughgoing muon data set is in favor of νμ→ντ oscillation hypothesis with a probability of 36.6% against the 0.36% for the no oscillation hypothesis. In the low energy range, the two data set are also in favor to the oscillation hypothesis showing a large deficit for IU events and a reduced deficit for US+ID events, since only the US events (=50%) are expected to oscillate. Assuming a νμ→ντ oscillation scheme, the results suggest a large range of the parameter values centered around Δm²⁼0.0025 e V^2, sin²²θ=1

[en] A review on the streamer tubes developed in Frascati is presented: in particular their main features, the components and their various applications in high energy experiments. 28 refs.; 12 figs

[en] The requirement of high rate capability for operation at LHC, led 20 years ago to the achievement of Resistive Plate Chambers operated in avalanche mode, thanks to the introduction of new gas mixtures and to the development of the Front-End electronics. The need for a further increase of the rate capability, in view of the upgrades of LHC, is imposing new detector geometries with thinner gas gaps and electrodes. Streamer operation of RPCs may still be suitable for low rate experiments, and therefore in this paper a comparison between two different detector geometries, the old standard and the newly proposed one, is performed in streamer mode.

[en] In this paper, the possibility to exploit a high energy beta beam without massive detectors is discussed. The radioactive ions are boosted up to very high γ with the neutrino beam pointing towards an instrumented surface located at a moderate baseline (e.g. from CERN to the Gran Sasso Laboratories). ν_e →ν_μ oscillations and their CP conjugate are tagged as an excess of horizontal muons produced in the rock and tracked by the low-mass instrumented surface installed in one of the LNGS experimental halls. We show that the performance of this complex for what concerns the determination of the θ₁₃ angle of the leptonic mixing matrix is comparable with the current low-γ design based on a gigantic water Cherenkov at Frejus. (orig.)

[en] Resistive Plate Chambers (RPCs) are widely used in high energy physics. While avalanche mode operation is mandatory in high rate environments (ATLAS and CMS experiments at LHC), streamer mode operation is often preferred in low rate applications because of the high signal amplitude. Typical mixtures for streamer operation are composed of Argon, Tetrafluoroethane and Isobutane, with additions of SF₆ below 1% to reduce the charge delivered in the gas. In this paper, results about the streamer properties observed with different mixtures are presented.

[en] The present paper is meant as an update of the presentation given in a previous Resistive Plate Chamber (RPC) workshop, aimed at finding an eco-friendly gas mixture for streamer operation of RPCs. Indeed the streamer working regime is still suitable for building large RPC systems dedicated to low rate applications, such as cosmic ray and neutrino physics. In addition to other studies about gas mixtures for streamer mode operation, in this paper the replacement of R134a with CF₄, a gas widely used in other gaseous detectors, has been investigated. The effect of the gas gap thickness on the discharge quenching has also been studied; this is an important check because thin gas gaps of 1 mm, one half of the typical used value, have been introduced for high rate applications. Finally preliminar results about the streamer formation timing are also reported.

No abstract available