L. Guerriero

Measurement of p̄p→π0π0, π0η0 in the T and U-meson region

Abstract We present measurements from a counter-optical spark chamber experiment of the differential cross sections for pp → π 0 π 0 , π 0 η 0 at 25 momenta in the range 1.1 − 2.0 GeV/ c (c.m. energy 2.12 to 2.43 GeV). Approximately 750 000 pictures were taken in the experiment.

Observation of structure in p̄p → π0π0

Abstract We present a partial wave amplitude analysis of the differential cross sections for pp → π 0 π 0 at 25 energies from 2.12 to 2.43 GeV. The results suggest the presence of a J PC I G = 2 ++ 0 + resonance at 2.15 GeV. An isospin decomposition of pp → π + π - is also presented.

A 4π scintillation counter-optical spark chamber system for neutral particles

Abstract We describe a scintillation counter - optical spark chamber system developed for the detection of high energy gamma rays and neutrons. We describe the system components and their use in two completed experiments.

Multiwire proportional chamber system of the Fermilab single arm spectrometer.

We describe a system of two groups of multiwire proportional chambers and its special purpose interface used in the Single Arm Spectrometer (SAS) facility at Fermilab. The first set measures the coordinates of the fast particle going into the spectrometer arm with a space resolution down to +/-0.5 mm. The second set, close to the target, measures the multiplicity and angular distributions of charged particles coming from the interaction. The chambers of this set have three sensitive planes with wires at 120 degrees in the same gas volume to measure three coordinates for each physical point, two readout channels per wire to minimize the inefficiency due to the very high flux and insensitive regions at the center of the chambers where they are crossed by the beam.

Alternate polarity multiple spark gap for high efficiency shower detectors

Abstract The developments in the hv pulsing system which have been made in order to reduce the rise time and the delay of the hv pulse at the plates of a large spark chamber system are reported. Higher efficiency has been achieved feeding each chamber through an alternate polarity multiple spark gap.

Search for Heavy Long-Lived Particles

We have performed a high-sensitivity search for massive long-lived particles produced at 2.5 mrad by 400-GeV/c protons on a beryllium target using time-of-flight, Cherenkov, and calorimetric techniques. A total of 10{sup 11} light particles ({pi}{sup -},K{sup -},{bar p}) was sampled at 70 GeV/c. This experiment places a limit of 1.1 x 10{sup -37} cm{sup 2}/(GeV/c){sup 2} {center_dot} nucleon on the invariant cross section for the production of stable particles in the mass range of 4 to 10 GeV/c{sup 2}.