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Borexino is an experiment for low energy neutrino spectroscopy at the GranSasso underground laboratories. It is designed to measure the mono-energetic$^7$Be solar neutrino flux in real time, via neutrino-electron elasticscattering in ultra-pure organic liquid scintillator. Borexino has thepotential to also detect neutrinos from the \emph{pep} fusion process and theCNO cycle. For this measurement to be possible, radioactive contamination inthe detector must be kept extremely low. Once sufficiently clean conditions aremet, the main background source is $^{11}$C, produced in reactions induced bythe residual cosmic muon flux on $^{12}$C. In the process, a free neutron isalmost always produced. $^{11}$C can be tagged on an event by event basis bylooking at the three-fold coincidence with the parent muon track and thesubsequent neutron capture on protons. This coincidence method has beenimplemented on the Borexino Counting Test Facility data. We report on the firstevent by event identification of \emph{in situ} muon induced $^{11}$C in alarge underground scintillator detector. We measure a $^{11}$C production rateof 0.130 $\pm$ 0.026 (stat) $\pm$ 0.014 (syst) day$^{-1}$ ton$^{-1}$, inagreement with predictions from both experimental studies performed with a muonbeam on a scintillator target and \emph{ab initio} estimations based on the$^{11}$C producing nuclear reactions.Comment: 6 pages, 5 figures, 2 table

physical review. c. nuclear physics/physical review. c, nuclear physics

CNO and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="italic">pep</mml:mi></mml:mrow></mml:math>neutrino spectroscopy in Borexino: Measurement of the deep-underground production of cosmogenic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">C</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>11</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>in an organic …

CNO andpepneutrino spectroscopy in Borexino: Measurement of the deep-underground production of cosmogenicC11in an organic …