D. Owen

Hadron and electron response in a uranium liquid argon calorimeter from 10 to 150 GeV

Abstract A uranium liquid argon calorimeter, with a total depth of nine absorption lengths, has been exposed to electrons and hadrons in the energy range of 10–150 GeV. Two configurations with different uranium plate thicknesses were successfully operated. In both cases the response was found to be linear over the entire energy regime. We present measurements of various contributions to energy resolution, differences in electron/hadronm/muon response, longitudinal and transverse shower profiles and electron position resolution.

Hadron showers in a low-density fine-grained flash chamber calorimeter

Abstract Hadronic showers at six incident particle energies from 33.8 to 415.4 GeV have been studied using the low-density fine-grained flash chamber calorimeter of the Lab C neutrino detector at Fermilab. Transverse distributions of unprecedented fine granularity have been obtained for a range of depths in the shower. Longitudinal energy distributions have been compared with those from iron-scintillator detectors. Some differences are observed which may be attributable to the different relative sensitivity of the two detector types to electromagnetic and hadronic shower components. Both longitudinal and transverse distributions have been parametrized. Fluctuations in energy deposition have been studied. The relative size of the fluctuations is largest near the starting vertex and in the tail of the shower, and falls slowly with increasing beam energy. Correlations between energy deposition in neighboring parts of the shower are observed, and anticorrelation is seen between energy deposition in the peak and in the tail of the shower. Containment lengths and widths have also been measured and parametrized.

Cherenkov and Scintillation Light Measurements with Scintillating Glass, SCG1C

We have been able to observe and measure both the direct Cherenkov (C) and the Scintillation (S) light components from scintillating glass, distinctly separated in time. This has important implications for hadron calorimetry, electron/hadron separation and low energy particle identification.

Hadron showers and muon trajectories in thick absorber from 25 to 150 GeV/c

Abstract Hadron shower punchthrough and muon momentum measurements were conducted at 25, 50, 100 and 150 GeV/ c , using tracking before, between and after a 7.3 interaction length ( λ 0 ) lead block and 7.3 λ 0 of magnetized iron. The multiplicity and spatial distributions of both hadrons and muons were obtained. Muons were used to study the multiple scattering, the effect of δ rays and associated phenomena, and the momentum resolution. Hadrons were used to study the muon/hadron rejection factor. The measured punchthrough probabilities after 7.3 λ 0 and 14.6 λ 0 were consistent with other data. Cuts are described which define the final rejection factor against hadrons.

A measurement of the response of an SCG1-C scintillation glass array to 4–14 GeV/c pions

An SCG1-C scintillation glass detector consisting of a 3.5 radiation length SCG1-C active converter followed by scintillation and gas tube hodoscopes and a 4 × 4 array of a 20.5 radiation length SCG1-C counters has been exposed to pions in the 4–14 GeV/c momentum range. The response of this detector to pions is compared with the response to electrons of the same momentum in order to study the capability of such a detector to distinguish the two types of particles. Using only longitudinal and tranverse shower development criteria, the electrons and pions can be separated such that on average 1.1 × 10−1 of all pions in the range of 4–14 Gev/c would be misidentified as electrons of any energy. If the momentum of the incident particle is known and can be used in the identification technique, this average fraction is reduced to 6.4 × 10−3 of all pions misidentified as electrons of the same momentum.

Signal and Noise Measurements for Muons in Scintillating Glass with Vacuum Photodiode Readout

We have been able to measure 6 photoelectrons per MeV of energy loss in scintillating glass, SCG-1, using large area vacuum photodiodes for readout with a signal to noise ratio of about 4.5.

Erratum to “hadron showers in a low-density fine-grained flash chamber calorimeter”☆

Abstract Our recent paper ∗ described an analysis of the energy deposition in hadronic showers at six incident particle energies from 33.8 to 415.4 GeV using the low-density fine-grained flash chamber calorimeter of the Lab C neutrino detector at Fermilab. More recent work on the subject has led us to revise some of the results presented for energies above 200 GeV. We present here revised results for the longitudinal and transverse energy deposition, and new coefficients for the parametrization of these curves.