EVENT IDENTIFICATION WITH A TIME PROJECTION CHAMBER IN A DOUBLE-BETA DECAY EXPERIMENT ON XE-136

被引：11

作者：

WONG, HT

IMEL, DA

JORGENS, V

TREICHEL, M

VUILLEUMIER, JC

机构：

[1] CALTECH,NORMAN BRIDGE LAB PHYS,PASADENA,CA 91125

[2] INST PHYS,CH-2000 NEUCHATEL,SWITZERLAND

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 1993年 / 329卷 / 1-2期

关键词：

D O I：

10.1016/0168-9002(93)90931-7

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A xenon time projection chamber has been constructed to study double beta decay in Xe-136. 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 0nubetabeta channel. The tracking performance of the TPC as well as the event analysis and background rejection procedures of the experiment are discussed.

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收藏

页码：163 / 172

页数：10

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