Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

S (Solid Earth Sciences) » S-IT Science of the Earth's Interior & Tectonophysics

[S-IT22] Interaction and Coevolution of the Core and Mantle in the Earth and Planets

Tue. May 22, 2018 3:30 PM - 5:00 PM International Conference Room (IC) (2F International Conference Hall, Makuhari Messe)

convener:Tsuyoshi Iizuka(University of Tokyo), Hidetoshi Shibuya(Department of Earth and Environmental Sciences, Faculty of Advanced Science and Technology, Kumamoto University), Taku Tsuchiya(愛媛大学地球深部ダイナミクス研究センター, 共同), Kenji Ohta(Department of Earth and Planetary Sciences, Tokyo Institute of Technology), Chairperson:Ohta Kenji, Kamada Seiji(FRIS, Tohoku Univ.)

4:45 PM - 5:00 PM

[SIT22-12] Geo-neutrino measurement with KamLAND

*Yutaka Shirahata1 (1.RCNS,Tohoku University)

Keywords:Geo-neutrino, radiogenic heat, Th/U mass ratio

Neutrino physics has been developing. The Kamioka Liquid-scintillator Antineutrino Detector (KamLAND) is marked by the ability to detect low-energy anti-neutrino signals at liquid scintillator of 1000 ton (LS) and demonstrated the oscillatory nature by observing anti-neutrino from nuclear reactors.
Geo-neutrino is created by uranium (238U) and thorium (232Th) and potassium (40K) in the Earth’s interior and KamLAND can detect directly geo-neutrino from the decay chains of 238U and 232Th and it brings unique and direct information about the Earth’s interior and thermal dynamics.
The KamLAND collaboration reported the first measurement result about geo-neutrino in 2005. The geo-neutrino signals at KamLAND were used to estimate our planet’s radiogenic heat production and constrain composition models of the bulk silicate Earth (BSE).
Recently, geo-neutrino sensitivity is improved because the neutrinos from nuclear reactor (reactor neutrino) that is main background of this measurement was decreased because of Fukushima nuclear accident in March 2011.
We will report about recent geo-neutrino measurement included low-reactor period with KamLAND.