First measurement of dE/dx with a GEM-based TPC
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- 作者：F.V. B枚hmer ; M. Ball ; S. D酶rheim ; K. Eckstein ; A. H枚nle ; C. H枚ppner ; B. Ketzer ; I. Konorov ; S. Neubert ; S. Paul ; J. Rauch ; S. Uhl ; M. V ; enbroucke ; M. Berger ; J.-C. Berger-Chen ; F. Cusanno ; L. Fabbietti ; P. Gasik ; R. M眉nzer ; R. Arora ; J. Fr眉hauf ; et al.
- 关键词：Time projection chamber ; Gas electron multiplier ; Specific energy loss ; Particle identification ; Exponentially modified Gaussian ; FOPI
- 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- 出版年：11 February, 2014
- 年：2014
- 卷：737
- 期：Complete
- 页码：214-221
- 全文大小：2154 K
文摘
In this work we present the first measurement of the specific energy loss (dE/dx) and an analysis of the resulting charged-particle identification (PID) capabilities of a large-scale TPC with GEM-based gas amplification. The data has been recorded inside the FOPI spectrometer at GSI, Germany, using reactions of 1.7 GeV/c pions impinging on a carbon target.
In the specific energy loss spectrum clear bands for pions, kaons, protons and deuterons are observed. The specific energy loss resolution is studied as a function of the total particle momentum and as a function of the track length. It is found to be , consistent with expectations.