e/ArDM

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has glosseng: ArDM (Argon Dark Matter) is a particle physics experiment based on a liquid argon detector, aiming at measuring signals from WIMPs (Weakly Interacting Massive Particles), which probably constitute the Dark Matter in the universe. Elastic scattering of WIMPs from argon nuclei is measurable by observing free electrons from ionization and photons from scintillation, which are produced by the recoiling nucleus interacting with neighbouring atoms. The ionization and scintillation signals can be measured with dedicated readout techniques, which constitute a fundamental part of the detector. In order to get a high enough target mass the noble gas argon is used in the liquid phase as target material. Since the boiling point of argon is at 87 K at normal pressure, the operation of the detector requires a cryogenic system.
lexicalizationeng: ARDM
instance ofc/Experiments for dark matter search
Meaning
Chinese
has glosszho: ArDM(Argon Dark Matter)是一個偵測暗物質的實驗,利用液態氬偵測弱交互作用質量粒子(Weakly Interacting Massive Particles)的實驗,弱交互作用質量粒子是暗物質的可能組成之一,在2006年在CERN實行,公用掉了一頓的液態氬,原理是當它與氬原子,氬原子會離子化,而產生可以被儀器增測到的電子。有時弱交互作用質量粒子會撞上氬原子核,而把它的能量傳給原子核,一般應該是介於1keV到100keV之間。雖然不知道弱交互作用質量粒子與氬原子撞擊的機率是多少,但根據超對稱理論應該每天會有100到0.01個撞擊事件發生。這個實驗最困難的地方就是,液態氬裡可能有氬-39,他是一種半衰期269年的同位素,可能會經由β衰变釋放出能量565 keV的電子,因此儀器必須設計分變的出才行。
lexicalizationzho: ArDM

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