Physics – Instrumentation and Detectors
Scientific paper
2003-10-16
Nucl.Instrum.Meth. A530 (2004) 453-462
Physics
Instrumentation and Detectors
submitted to Nuclear Instruments and Methods in Physics Research
Scientific paper
10.1016/j.nima.2004.05.095
Light concentrators for the solar neutrino experiment Borexino and the Counting Test Facility (CTF) have been developed and constructed. They increase the light yield of these detectors by a factor of 2.5 and 8.8, respectively. Technical challenges like long term stability in various media, high reflectivity and radiopurity have been addressed and the concepts to overcome these difficulties will be described. Gamma spectroscopy measurements of the concentrators show an upper limit of 12e-6 Bq/g for uranium and a value of 120e-6 Bq/g for thorium. Upper limits on other possible contaminations like 26Al are presented. The impact of these results on the performance of Borexino and the CTF are discussed and it is shown that the design goals of both experiments are fulfilled.
Grieb Ch.
Manno I.
Oberauer Lothar
von Feilitzsch Franz
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