Results from KamLAND

Abstract. Earth is our most familiar astronomical object. However, its properties are not very well known, because its interior is optically invisible. One of the most important parameters in under-standing Earth is heat generation. A large part of this heat is generated by the decay of radioactive elements, accompanying neutrino emissions, in the earth. KamLAND has provided precise deter-mination of neutrino oscillation parameters and revealed how neutrinos travel observing neutrinos from distant nuclear power reactors. Consequently, KamLAND has made neutrinos new tool to see through astronomical objects that are opaque. Success in the first observation of geologically-produced neutrinos with KamLAND is a break-through for observational geophysics and is the start of “Neutrino Geophysics”