A high-pressure hydrogen time projection chamber for the MuCap experiment

被引：3

作者：

Egger, J. ^{[1
]}

Fahrni, D. ^{[1
]}

Hildebrandt, M. ^{[1
]}

Hofer, A. ^{[1
]}

Meier, L. ^{[1
]}

Petitjean, C. ^{[1
]}

Andreev, V. A. ^{[2
]}

Banks, T. I. ^{[3
]}

Clayton, S. M. ^{[4
]}

Ganzha, V. A. ^{[2
]}

Gray, F. E. ^{[3
,5
,6
]}

Kammel, P. ^{[4
,6
]}

Kiburg, B. ^{[4
,6
]}

Kravtsov, P. A. ^{[2
]}

Krivshich, A. G. ^{[2
]}

Lauss, B. ^{[1
,3
]}

Maev, E. M. ^{[2
]}

Maev, O. E. ^{[2
]}

Petrov, G. ^{[2
]}

Semenchuk, G. G. ^{[2
]}

Vasilyev, A. A. ^{[2
]}

Vorobyov, A. A. ^{[2
]}

Vznuzdaev, M. E. ^{[2
]}

Winter, P. ^{[4
,6
]}

机构：

[1] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[2] Petersburg Nucl Phys Inst, Gatchina 188350, Russia

[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[4] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[5] Regis Univ, Dept Phys & Computat Sci, Denver, CO 80221 USA

[6] Univ Washington, Dept Phys, Seattle, WA 98195 USA

来源：

EUROPEAN PHYSICAL JOURNAL A | 2014年 / 50卷 / 10期

基金：

美国国家科学基金会;

关键词：

ELASTIC-SCATTERING; WIRE CHAMBERS; MUON-CAPTURE; PRECISION; SYSTEM; GAS; PERFORMANCE; SIMULATION; DETECTORS;

D O I：

10.1140/epja/i2014-14163-1

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The MuCap experiment at the Paul Scherrer Institute performed a high-precision measurement of the rate of the basic electroweak process of nuclear muon capture by the proton, mu(-) + p -> n + v(mu). The experimental approach was based on the use of a time projection chamber (TPC) that operated in pure hydrogen gas at a pressure of 10 bar and functioned as an active muon stopping target. The TPC detected the tracks of individual muon arrivals in three dimensions, while the trajectories of outgoing decay (Michel) electrons were measured by two surrounding wire chambers and a plastic scintillation hodoscope. The muon and electron detectors together enabled a precise measurement of the mu p atom's lifetime, from which the nuclear muon capture rate was deduced. The TPC was also used to monitor the purity of the hydrogen gas by detecting the nuclear recoils that follow muon capture by elemental impurities. This paper describes the TPC design and performance in detail.

引用

页数：16

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