[en] This paper presents the results of the first measurement on the yield of pions with momentum smaller than 220 MeV/c, produced by a 300 GeV/c proton beam. The measurements, performed at the CERN super proton synchrotron using tungsten production targets of different lengths, are discussed referring to the possibility of extending to high-energy laboratories the access to fundamental research involving low-energy pions and muons

[en] An experimental test of G-parity conservation is proposed, based on a measurement of the asymmetry around θ=π/2 in the center of mass of the π⁺π⁰ system for anti np annihilation in flight. The experiment can be performed by exploiting the high-intensity, low-energy anti n beam at LEAR and the OBELIX apparatus. (orig.)

[en] The influence of the value of g_A on the solar neutrino flux is discussed. It is shown that a more precise determination of g_A would be important to define the actual extent of the solar neutrino problem. (orig.)

[en] The results of an experiment aimed at verifying the conclusions drawn in the studies that were performed at the Institute of High-Temperature Electrochemistry (IHE, Yekaterinburg) and which report the observation of neutron emission due to low-temperature dd fusion in NaxWO3/deuterium systems are presented. Within statistical errors, the excess of the neutron yield above the background level is not observed in our experiment for the interaction of deuterium and deuterium-tritium mixture with oxide tungsten bronze. The hypothesis that hot dt fusion is possible in such systems is not confirmed either. The results of this study cast some doubt on the validity of the conclusions drawn in the IHE reports. At a 90% confidence level, an upper limit on the intensity In of a hypothetical neutron source associated with dd and dt fusion in the single crystals of oxide tungsten bronze is estimated to be 5x10-3 s-1

[en] The results of an experiment aimed at verifying the hypothesis that low-temperature nuclear fusion occurs in metal-hydrogen systems are presented. Titanium and an intermetallic compound ZrNbV saturated with a deuterium-tritium mixture are chosen for substances to be studied. Within experimental errors, no excess of neutron emission above the background level is observed for these substances saturated with a deuterium-tritium mixtures. The hypothesis that hot nuclear dt fusion occurs in metal/(D-T) systems is not confirmed in our experiment either

[en] The annihilation frequency of the reaction p(bar sign)p→π⁰π⁰ at rest in liquid hydrogen has been measured by the Obelix experiment by using different apparatus configurations and trigger conditions. The value obtained is f(π⁰π⁰, LH)=(2.8±0.1_stat±0.4_syst)x10^-4. With the same data samples, the π⁰η annihilation frequency has been determined to be f(π⁰η, LH)=(0.9±0.2_stat±0.1_syst)x10^-4. The results are discussed within the frame of the present experimental situation

[en] The relation between the branching ratios and direct CP asymmetries of B→Kπ decays and the angle γ of the CKM unitarity triangle is studied numerically in the general framework of the SU(3) approach, with minimal assumptions about the parameters not fixed by flavor-symmetry arguments. Experimental and theoretical uncertainties are subjected to a statistical treatment according to the Bayesian method. In this context, the experimental limits recently obtained by CLEO, BaBar and Belle for the direct CP asymmetries are translated into the bound vertical stroke γ-90 vertical stroke >21 at the 95% C.L. A detailed analysis is carried out to evaluate the conditions under which measurements of the CP averaged branching ratios may place a significant constraint on γ. Predictions for the ratios of charged (R_c) and neutral (R_n) B→Kπ decays are also presented. (orig.)

[en] Within errors of measurements, no tritium yield due to low-temperature nuclear dd fusion is observed in titanium of various modifications and in intermetallic compounds ZrNbV, LaCo5, LaNi4.9Al0.1, and MM0.7Ti0.3Mn2 saturated with deuterium. At a 90% confidence level, upper limits on the rate of dd fusion with tritium production in titanium and intermetallic compounds are found to be as follows: λf(Ti)≤2x10-23 s-1 (dd)-1 and λfeff (Ti; intermet.)≤6x10-24 s-1 (dd)-1

[en] In this document the pretrigger system developed for the electromagnetic calorimeter of the HERA-B experiment is described. The system owns a lot of frontier features for calorimetry-based triggers and its design for the future high-energy collider experiments

[en] Data on p slowing down and capture in helium at 1 and 0.2 mb at room temperature are presented and compared to the corresponding previously publicated data in molecular hydrogen and deuterium. A Monte Carlo simulation containing a low-energy extrapolation of measured p electronic stopping power in helium gas, screened Rutherford collisions, and simple cascade mechanisms is able to reproduce the gross features of the data, but cannot explain some nontrivial details of the measured distributions