Title: Vertex reconstruction improvement in KamLAND and prospects for geoneutrino directionality analysis.

Abstract: It has been shown that, in double-coincidence antineutrino experiments, the direction of incident antineutrinos is correlated with the vector between the prompt and delayed signals. This, in principle, makes it possible to determine the direction to the antineutrino source by means of directionality analysis which, once implemented, would be especially important for neutrino geophysics. However, due mostly to the limited available statistics, the practical feasibility of such a study is not guaranteed. Discussed are the prospects of geoneutrino directionality analysis in KamLAND, potential pitfalls of this technique, and the conditions that any similar experiment must meet to enable such a study.