Performance of the hexagonal calorimeter at PEP-4

https://doi.org/10.1016/0167-5087(83)90145-XGet rights and content

Abstract

A Geiger-mode electromagnetic shower calorimeter has been constructed for PEP-4. Six trapezoidal modules cover 75% of 4π solid angle in a hexagonal array. Each module contains 40 sense wire planes between 0.25 radiation-length thick lead-laminates, and is divided electrically into submodules of 27 and 13 layers. Half-degree wide hodoscopic channels in projective geometry provide excellent spatial resolution. In each gap three stereo views using the sense wires as well as strips on both cathodes at ±60° to the wires provide good shower reconstruction capabilities in multi-track jet events. Calibration and data analysis procedures are outlined. The performance of the calorimeter in the measurement of Bhabha events and the reconstruction of π0's in jet events is in excellent agreement with Monte Carlo simulations. The π0 mass resolution is MeV (rms).

References (4)

  • M. Nakamura

    Nucl. Instr. and Meth.

    (1978)
  • A. Barbaro-Galtieri et al., LBL-15030 and Nucl. Instr. and Meth. (in...
There are more references available in the full text version of this article.

Cited by (8)

View all citing articles on Scopus

We would like to express our gratitude especially to K. Mirk for his overall project management, to J. Gunn, O. Draeger and F. Goozen for the design and construction of the calorimeter, and to M. Nakamura and R. Jared for the electronics design. We are indebted for the beams to the PEP operations group.

This work is supported by the Department of Energy (DOE), the National Science Foundation (NSF), and the Japan-US Cooperative Research Project on H.E. Physics under Japan MOE and US DOE.

View full text