A measurement of the group velocity of scintillation light in liquid argon
[2];
[2];
- European Organization for Nuclear Research (CERN), Geneva (Switzerland); Polish Academy of Sciences (PAS), Krakow (Poland)
- European Organization for Nuclear Research (CERN), Geneva (Switzerland)
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
- Istituto Nazionale di Fisica Nucleare (INFN), Pavia (Italy)
- Istituto Nazionale di Fisica Nucleare (INFN), Milan (Italy)
- European Organization for Nuclear Research (CERN), Geneva (Switzerland); Univ. of Bern (Switzerland)
The propagation velocity of scintillation light in liquid argon $$v_{g}$$, at $$\lambda \sim 128$$~nm wavelength, has been measured for the first time in a dedicated experimental setup at CERN. The obtained result $$\frac{1}{v_{g}} = 7.46 \pm 0.03$$~ns/m , is then used to derive the value of the refractive index (n) and the Rayleigh scattering length ($$\mathcal{L}$$) for liquid argon in the VUV region. For $$\lambda = 128$$~nm we found $$n= 1.357 \pm 0.001$$ and $$\mathcal{L}= (99.9 \pm 0.8$$)~cm. Such information are of interest for a variety of experiment searching for rare events like neutrino and dark matter interactions. The derived quantities also represent key information for the theoretical models describing the propagation of scintillation light in liquid argon.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1647079
- Report Number(s):
- arXiv:2002.09346; FERMILAB-PUB-20-397-ND; oai:inspirehep.net:1781791; TRN: US2202880
- Journal Information:
- Journal of Instrumentation, Vol. 15, Issue 09; ISSN 1748-0221
- Publisher:
- Institute of Physics (IOP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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