A "dwarf ball": Design, instrumentation, and response characteristics of a 4π light charged-particle multidetector system

D. G. Sarantites, L. G. Sobotka, T. M. Semkow, V. Abenante, J. Elson, J. T. Hood, Z. Li, N. G. Nicolis, D. W. Stracener, J. Valdes, D. C. Hensley

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

A 4π light charged-particle spectrometer is described. The spectrometer consist of 72 fast-low plastic scintillator phoswiches closely packed in a 4π arrangement. The device is small enough to be enclosed in the spin spectrometer scattering chamber. For each detector that fires, the fast ΔE and slow E pulse heights and a time for each group of 16 detectors are recorded. From this information protons and α particles can be identified and their energies measured over a large dynamic range. The geometry, construction, electronics and data acquisition system are discussed. Examples are given of the performance of this spectrometer from an experiment in which Si (ΔE, E) heavy-ion telescopes were used as event triggers and the spin spectrometer detected γ rays and neutrons.

Original languageEnglish
Pages (from-to)319-326
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume264
Issue number2-3
DOIs
StatePublished - Feb 15 1988
Externally publishedYes

Funding

The excellent cooperation and the fine craftmanship of the staff of the Department of Chemistry Machine Shop at Washington University during the construction of the Dwarf Ball is greatly appreciated. This work was supported in part by the US Department of Energy under contract nos. DE-AS02-76ER04052 and DE-AC02-85ER40210. One of us (L.G.S.) acknowledges support from a US Presidential Young Investigator award. Oak Ridge National Laboratory is operated by Martin Marietta Energy Systems, Inc., under contrast no. DE-AC-84OR21400 with the US Department of Energy.

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