Event identification with a time projection chamber in a double beta decay experiment on 136Xe

被引：0

作者：

Wong, H.T. ^{[1
]}

Imel, D.A. ^{[1
]}

Jorgens, V. ^{[1
]}

Treichel, M. ^{[1
]}

Vuilleumier, J.-C. ^{[1
]}

机构：

[1] California Inst of Technology, Pasadena, United States

来源：

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 1993年 / A329卷 / 1-2期

关键词：

Particle detectors - Xenon;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

A xenon time projection chamber has been constructed to study double beta decay in 136Xe. The excellent track reconstruction capability of the TPC provides a powerful means of background identification. We have demonstrated the novel technique of measuring the directionality of low energy (MeV range) electrons by the difference of dE/dx between their beginnings and ends. Rejection efficiencies are 100% for alpha particles, cosmic muons and multiple Compton scattering, and more than 98% for single electrons, while the identification efficiencies for events due to neutrinoless double beta decay are 76% and 65% for the mass mechanism and right-handed currents modes, respectively. Very sensitive limit has been achieved for the half-life of the 0vββ channel. The tracking performance of the TPC as well as the event analysis and background rejection procedures of the experiment are discussed.

引用

页码：163 / 172