Biography:

In the past M. Spiro has collaborated on articles with C. Cochet and J. Rich. One of their most recent publications is The central electromagnetic calorimeter of UA1. Which was published in journal Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.

More information about M. Spiro research including statistics on their citations can be found on their Copernicus Academic profile page.

M. Spiro's Articles: (9)

The central electromagnetic calorimeter of UA1

AbstractWe describe the construction, calibration and performance of the central electromagnetic calorimeter of the UA1 experiment at the CERN proton-antiproton collider. The calorimeter is of the lead-scintillator sandwich type. It is 26.4 radiation lengths thick and covers a surface of about 50 m2.We estimate the resolution of the calorimeter for electrons of energy greater than 1 GeV to be the sum in quadrature of 15%√E (E in GeV) and a constant 3%. The first term comes from the inherent resolution of the calorimeter due to sampling fluctuations and photostatistics. The second term comes from uncertainties in the calibration procedure and dominates the resolution for electrons from W and Z0 decay. The uncertainty in the overall energy scale also reflects the uncertainties in the calibration procedure and is estimated to be 3%.

Experimental particle physics without accelerators

AbstractWe review the phenomenology, the techniques, and the results of particle-physics experiments that are performed beyond the confines of accelerator laboratories.

New experimental limits on radiative neutrino decay

AbstractWe have searched for radiative decays of electron-antineutrinos produced by a nuclear reactor giving photons with wavelenghts in the sensitivity range of a photomultiplier. The absence of signal puts stringent limits on such a decay, and excludes it as an explanation for the solar neutrino problem, even for nearly degenerate masseigenstates, provided that Δm/m> 3 × 10−7. No previous limits, including those coming from SN 1987A, could exclude such as explanation for small values of Δm/m.

Determination of the K−π− inelastic cross sections for c.m. energy up to 2.8 GeV

AbstractThe reaction K−p→Δ++ + anything was studied at 14.3 GeV/c and is production mechanism was found to be consistent with one pion exchange at low momentum transfer. K−π− inelastic and total cross sections have been determined by a Chew-Low extrapolation method in the c.m. energy range from threshold to 2.8 GeV. Cross sections for various K−π− final states are presented.

Inclusive production of Y∗ resonances in K−p interactions at 14.3 GeV/c

AbstractThe inclusive production of Σ+(1385), Σ−(1385), Λ(1405) and Λ(1523) in K−p interactions at 14.3 GeV/c is studied. Cross sections are presented and the x dependence of the invariant cross sections is discussed. The density matrices for production of the spin-32 resonances at small momentum transfer to the target are consistent with spin-0 exchange.

Momentum transfer distributions of some diffractive enhancements in K−p interactions at 14.3 GeV/c

AbstractWe discuss the structure of the momentum transfer distributions for the diffractive dissociation processes p → nπ+, p → Δ++π− and K− → K890∗0π−. In the near-threshold mass region a clear break of slope is found around t′KK ∼ 0.25 GeV2 for the two baryonic channels, whereas no comparable structure is seen for the mesonic system. The K → K∗π differential cross section exhibits a nearly exponential behaviour up to t′pp ∼ 0.6 GeV2, falling over three orders of magnitude. The slope variations and breaks are strongly correlated both to the mass region considered and to the decay angle of the fragmentation system.

The neutron induced background in GALLEX

AbstractA radiochemical experiment has been performed in the Gran Sasso Underground Laboratory to measure the fast neutron flux in the environment of the GALLEX Solar Neutrino experiment. Neutrons are detected via the reaction n +40Ca→ 37Ar +4He and the calcium target is in the form of 470 ƒ of a calcium nitrate solution. It is found that only 0.44±0.24 37Ar atom is produced per day. This leads to a neutron flux above 2.5 McV of (0.9±0.6) × 10−7 cm−2· s1. An evaluation of the neutron induced background in the GALLEX experiment is done using a Monte Carlo simulation program. The value obtained. 0.15±0.10 SNU. is about 0.2% of the signal measured by GALLEX.

The leaching of lead from platinized platinum electrodes in acid solution

SummaryThe rate of leaching of lead from platinized platinum electrodes has been studied, and was found to require the presence of both acid and oxygen. The results indicate that only the lead in the top 2 or 3 atomic layers of the deposit dissolves and that it is largely present there in the form of PbO; most of the dissolution occurs within an hour. The potentials of lead-containing platinized platinum electrodes behave in a non-Nernstian manner in the presence of lead nitrate.

Baryonic dark matter

AbstractThis paper discusses the existence of baryonic dark matter in the universe confronted with the fundamental parameters and observations in cosmology. The various possible baryonic candidates are discussed with special emphasis on the MACHOs, which would be dim compact halo objects clustered at galactic scales.

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