caa a22 4500 467897069 CHVBK 20180406152806.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1007/s11038-006-9120-8 doi (NATIONALLICENCE)springer-10.1007/s11038-006-9120-8 Enomoto Sanshiro Research Center for Neutrino Science, Tohoku University, Aramaki Aoba, Aobaku, Miyagi, 980-8578, Sendai, Japan aut Experimental Study of Geoneutrinos with KamLAND [Elektronische Daten] [Sanshiro Enomoto] The Kamioka liquid scintillator antineutrino detector (KamLAND), which consists of 1000 tones of ultra-pure liquid scintillator surrounded by 1879 photo-multiplier tubes (PMT), is the first detector sensitive enough to detect geoneutrinos. Earth models suggest that KamLAND observes geoneutrinos at a rate of 30 events/1032-protons/year from the 238U decay chain, and 8 events/1032-protons/year from the 232Th decay chain. With 7.09×1031 proton-years of detector exposure and detection efficiency of 0.687 ± 0.007, the ‘rate-only' analysis gives $$25_{-18}^{+19}$$ geoneutrino candidates. Assuming a Th/U mass concentration ratio of 3.9, the ‘rate + shape' analysis gives the 90% confidence interval for the total number of geoneutrinos detected to be from 4.5 to 54.2. This result is consistent with predictions from the Earth models. The 99% C.L. upper limit is set at 1.45×10−31 events per target proton per year, which is 3.8times higher than the central value of the model prediction that gives 16TW of radiogenic heat production from 238U and 232Th. Although the present data have limited statistical power, they provide by direct means an upper limit for the Earth's radiogenic heat of U and Th. Springer Science+Business Media, Inc., 2006 Geoneutrino nationallicence KamLAND nationallicence earth energetics nationallicence bulk silicate earth nationallicence Earth, Moon, and Planets Kluwer Academic Publishers 99/1-4(2006-12-01), 131-146 0167-9295 99:1-4<131 2006 99 11038 https://doi.org/10.1007/s11038-006-9120-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11038-006-9120-8 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Enomoto Sanshiro Research Center for Neutrino Science, Tohoku University, Aramaki Aoba, Aobaku, Miyagi, 980-8578, Sendai, Japan aut NATIONALLICENCE 773 0- Earth, Moon, and Planets Kluwer Academic Publishers 99/1-4(2006-12-01), 131-146 0167-9295 99:1-4<131 2006 99 11038 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer