Spallation-Induced Backgrounds in the KamLAND Detector

The KamLAND detector provides a good environment for the study of low-energy backgrounds due to the interaction of cosmic ray muons with the detector material. At 2700 m.w.e overburden a muon rate of 0.3\,Hz is measured in the main detector. The rough rates of $\sim$3000 spallation neutrons, $\sim$60 $^{12}$B/$^{12}$N, and $\sim$1.5 $^{9}$Li/$^{8}$He per kton-day are measured. The contribution of $^{12}$N is $\sim$1\% and $^{8}$He is limited to less than 15\% at 90\%\,C.L. The ongoing studies of these backgroungs will be discussed.