C₄F₁₀

C₄F₁₀, Perfluoro-n-butane, is one of the two Cherenkov radiators to be used in the RICH1 detector at the LHCb experiment. Its refractive index n = 1.0014 in gas form makes it suitable for charged particles identification in the intermediate momentum range 10-60 GeV/c.

IUPAC name	1,1,1,2,2,3,3,4,4,4-decafluorobutane
alternate names	butane, decafluoro-; decafluorobutane; perfluorobutane; sonazoid
refractive index n @ λ=400nm	1.0014	O. Ullaland, Fluid systems for RICH detectors, Nucl. Instrum. Meth. A 553 (2005) 107
n parametrization @ 0°C and 101325 Pa	(n-1) ⨉ 106=0.25324/(73.7-2-(λ/nm)-2)	O. Ullaland, Fluid systems for RICH detectors, Nucl. Instrum. Meth. A 553 (2005) 107
radiator length	95 cm	LHCb collaboration, The LHCb Detector at the LHC, Journal of Instrumentation, Vol. 3, No. 08. (2008), pp. S08005-S08005
photon yield for β~1 charged particles	~ 30	LHCb collaboration, The LHCb Detector at the LHC, Journal of Instrumentation, Vol. 3, No. 08. (2008), pp. S08005-S08005
momentum range	10-60 GeV/c
gas price (2000)	930 CHF / m3	M. Bosteels et al., LHCb RICH gas system proposal, LHCb-2000-079
melting point (1 bara)	-128.2 °C	M. Bosteels et al., LHCb RICH gas system proposal, LHCb-2000-079
boiling point (1 bara)	-1.9 °C	M. Bosteels et al., LHCb RICH gas system proposal, LHCb-2000-079

-- DvD - 06 Apr 2007