Spontaneous light emission from fibers in MINOS

S Avvakumov,M Kordosky,P Vahle,K Ruddick,B Rebel,T Belias,M Proga,L Mualem,William H Miller ,R Lee ,R J Nichol ,G F Pearce ,K Lang ,A R Erwin ,J Liu ,J K Nelson ,C Bower ,W L Barrett ,C Smith ,J C Thomas ,R Webb

doi:10.1016/j.nima.2005.01.340

Spontaneous light emission from fibers in MINOS

S Avvakumov, M Kordosky + Show 19 more

https://doi.org/10.1016/j.nima.2005.01.340

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Journal: Nuclear Inst. and Methods in Physics Research, A	Publication Date: Apr 7, 2005
Citations: 4

Affiliation: Stanford University, The University of Texas at Austin, University of Minnesota, Indiana University Bloomington, Rutherford Appleton Laboratory, Harvard University Press, University College London, University of Wisconsin–Madison, William & Mary, Williams (United States), Western Washington University, California Institute of Technology

#Spontaneous Light Emission #Exponential Fall Off + Show 8 more

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Abstract

We report on the observation and measurements of unexpected background rates in the MINOS Far Detector. The noise level at the Far Detector is significantly greater than that expected from natural radioactivity and intrinsic photomultiplier dark current. We have conducted a series of additional tests which demonstrate that the excess rate is caused by spontaneous light emission in the wavelength-shifting fibers, which are used to read out signals from scintillator strips. This noise due to fibers exhibits an exponential fall off with time with a decay time constant of the order of 100 days.

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