Study of radon reduction in gases for rare event search experiments
| العنوان: | Study of radon reduction in gases for rare event search experiments |
|---|---|
| المؤلفون: | Y. Wang, Minjie Lei, R.S. Raymond, A. Sander, T. Edberg, K. Pushkin, D. Anbajagane, C. R. Hall, J. E. Armstrong, J. Schaefer, Wolfgang Lorenzon, M. Arthurs, Carl W. Akerlof, D. Seymour, M. Reh, D. Saini, N. Swanson, Jacob Bringewatt |
| المصدر: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 903:267-276 |
| بيانات النشر: | Elsevier BV, 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Physics, Arrhenius equation, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Argon, 010308 nuclear & particles physics, Analytical chemistry, FOS: Physical sciences, chemistry.chemical_element, Radon, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Nitrogen, symbols.namesake, Adsorption, Xenon, chemistry, 0103 physical sciences, symbols, 010306 general physics, Saturation (chemistry), Instrumentation, Background radiation |
| الوصف: | The noble elements, argon and xenon, are frequently employed as the target and event detector for weakly interacting particles such as neutrinos and Dark Matter. For such rare processes, background radiation must be carefully minimized. Radon provides one of the most significant contaminants since it is an inevitable product of trace amounts of natural uranium. To design a purification system for reducing such contamination, the adsorption characteristics of radon in nitrogen, argon, and xenon carrier gases on various types of charcoals with different adsorbing properties and intrinsic radioactive purities have been studied in the temperature range of 190-295 K at flow rates of 0.5 and 2 standard liters per minute. Essential performance parameters for the various charcoals include the average breakthrough times ($\tau$), dynamic adsorption coefficients (k$_a$) and the number of theoretical stages (n). It is shown that the k$_a$-values for radon in nitrogen, argon, and xenon increase as the temperature of the charcoal traps decreases, and that they are significantly larger in nitrogen and argon than in xenon gas due to adsorption saturation effects. It is found that, unlike in xenon, the dynamic adsorption coefficients for radon in nitrogen and argon strictly obey the Arrhenius law. The experimental results strongly indicate that nitric acid etched Saratech is the best candidate among all used charcoal brands. It allows reducing total radon concentration in the LZ liquid Xe detector to meet the ultimate goal in the search for Dark Matter. Comment: 11 pages, 10 figures |
| تدمد: | 0168-9002 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e473e51742c58b97406ab47ed231344 https://doi.org/10.1016/j.nima.2018.06.076 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....6e473e51742c58b97406ab47ed231344 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 01689002 |
|---|