M. Capponi

A Measurement of the Muon Capture Rate in Liquid Deuterium by the Lifetime Technique

Abstract The lifetime technique has been used to measure the muon capture rate in ultra pure liquid deuterium in conditions where the μd spin state is known. The experimental method avoids the earlier difficulties due to the fusion neutrons. The following result has been obtained for the capture rate in the μd doublet total spin state: λcD = 470 ± 29 s−1.

Performance of a coincidence neutron spectrometer with double pulse-shape discrimination

Abstract We describe here the performance of a new coincidence spectrometer which allows the detection of neutrons in the MeV energy range, by exploiting a two-stage pulse-amplitude analysis.

The Electromagnetic calorimeter for the OBELIX experiment

Abstract We describe the electromagnetic calorimeter of the OBELIX detector installed on the LEAR facility at CERN: the criteria followed to design its structure and the tests and preparation work performed on the different components are discussed, to conclude with the description of the main control procedures operating on the assembled detector during the first tests of the apparatus on the LEAR beam.

Energy Cost of Pions and Muons for Muon-Catalyzed Fusion.

We present the results of systematical calculations on the energy expenditure in producing pion and muons for the purposes of muon-catalyzed fusion.

Monte Carlo simulated detector responses to gamma radiations coming from extended sources

Abstract An efficient Monte Carlo computer program for calculation of the responses of cylindrical NaI(Tl) and Ge gamma-ray detector is described. All the fundamental physical processes occuring inside an extended source of any shape, in a possible source-detector separation wall and in the detector itself, are taken into account. Very fast and accurate analytical expression for the absorption coefficients are obtained. The results show good agreement with experimental data and with other calculations. A more detailed investigation of the case of spherical sources and NaI(Tl) crystals is discussed.

On the possibility of performing a G-parity violation test in the annihilation reaction np→π+ + π0

Abstract 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 from n p annihilation in flight. The experiment can be performed by exploiting the high-intensity, low-energy n beam at LEAR and the OBELIX apparatus.

On the energy cost of producing muons in a deuterium-tritium target for muon catalyzed fusion

The costs of producing negative muons in d‐t targets at different densities are determined. The advantages of a segmented target structure are discussed, alternating high‐density layers to suitably dimensioned vacuum gaps.

Density Dependence of the Energy Cost of Muons for Muon-Catalyzed Fusion

The dependence of the energy cost of muons on the target density for the purposes of muon-catalyzed fusion in a deuterium-tritium target is investigated. The advantages of a particular target structure are discussed.

High Yield of Low-Energy Pions from a High-Energy Primary Proton Beam

We present 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.

Measurement of a very low neutron background within a significant gamma‐ray environment by means of a coincidence spectrometer with n‐γ pulse‐shape discrimination

We present the results of measurements of the gamma‐ray and neutron background in the Gran Sasso Laboratory, which were performed by a novel coincidence spectrometer allowing neutron identification by means of two different stages of pulse‐amplitude analysis.