First Observation of Neutral Bremsstrahlung Electroluminescence in Liquid Argon

被引：1
|
作者：
Bondar, A.
Buzulutskov, A.
Frolov, E. [1 ]
Borisova, E.
Nosov, V.
Oleynikov, V.
Sokolov, A.
机构：
[1] RAS, SB, Budker Inst Nucl Phys, Lavrentiev Ave 11, Novosibirsk 630090, Russia
来源：
PHYSICAL REVIEW LETTERS | 2023年 / 131卷 / 24期
基金：
俄罗斯科学基金会;
关键词：
HOT-ELECTRONS; GASES; SPECTRA; XENON;
D O I：
10.1103/PhysRevLett.131.241001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A recent discovery of additional mechanism of electroluminescence (EL) in noble gases due to the neutral bremsstrahlung (NBrS) effect led to a prediction that NBrS EL should be present in noble liquids as well. A theoretical model of NBrS EL in noble liquids was developed accordingly in the frameworks of Cohen-Lekner and Atrazhev. In this work, we confirm this prediction: For the first time, visible-range EL has been observed in liquid argon at electric fields reaching 90 kV/cm, using gas electron multiplier (GEM) and thick GEM structures. Absolute light yields of the EL were measured and found to be in excellent agreement with the theory, provided that the momentum-transfer cross section of electron scattering is used for calculation of the NBrS cross section (instead of the energy-transfer one).
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页数：6
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