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Alpha from natural radioactivity may interact with a nucleus and emit aneutron. The reaction introduces background to the liquid scintillator (LS)based neutrino experiments. In the LS detector, alpha comes from 238U, 232Thand 210Po decay chains. For Gadolinium-doped LS (Gd-LS) detector, alpha alsocomes from 227Ac. The nucleus 13C is a natural component of Carbon which isrich in the LS. The background rate and spectrum should be subtracted carefullyfrom the neutrino candidates. This paper describes the calculation of neutronyield and spectrum with uncertainty estimated. The results are relevant formany existing neutrino experiments and future LS or Gd-LS based experiments.

13C(alpha,n)16O background in a liquid scintillator based neutrino experiment