Looking for antineutrino flux from $^{40}$K with large liquid   scintillator detector
  We regard the possibility of detecting the antineutrino flux producing by the $^{40}$K placing inside the Earth. Thermal flux of the Earth could be better understood with observing such a flux. Lower and upper limitations on the $^{40}$K antineutrino flux are presented. 
V. V. Sinev, L. B. Bezrukov, E. A. Litvinovich, I. N. Machulin, M. D.   Skorokhvatov, S. V. Sukhotin
physics.ins-det hep-ex