Status and New Data of the Geochemical determination of the pp-Neutrino Flux by LOREX

Pavicevic, Miodrag and Bosch, Fritz and Amthauer, Georg and Anicin, Ivan and Boev, Blazo and Bruchle, Willy and Cvetkovic, Vladica and Djurcic, Z. and Henning, Walter and Jelenkovic, Rade and Pejovic, Vladan and Weiss, Achim (2012) Status and New Data of the Geochemical determination of the pp-Neutrino Flux by LOREX. Advances in High Energy Physics, 2012.

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LOREX (LORandite EXperiment) addresses the determination of the solar (pp) neutrino flux during the last four million years by exploiting the reaction with an incomparably low-energy threshold of 50 keV for the capture of solar neutrinos. The ratio of 205Pb/205Tl atoms in the Tl-bearing mineral lorandite provides, if corrected for the cosmic-ray induced background, the product of the flux of solar neutrinos and their capture probability by 205Tl, averaged over the age of lorandite. To get the mean solar neutrino flux itself, four problems have to be addressed: (1) the geological age of lorandite, (2) the amount of background cosmic-ray-induced 205Pb atoms which strongly depends on the erosion rate of the lorandite-bearing rocks, (3) the capture probability of solar neutrinos by 205Tl and (4) the extraction of lorandite and the appropriate technique to “count” the small number of 205Pb atoms in relation to the number of 205Tl atoms. This paper summarizes the status of items 1 (age) and 3 (neutrino capture probability) and presents in detail the progress achieved most recently concerning the items 2 (background/erosion) and 4 (“counting” of 205Pb atoms in lorandite).

Item Type: Article
Subjects: Natural sciences > Other natural sciences
Divisions: Faculty of Natural and Technical Sciences
Depositing User: Blazo Boev
Date Deposited: 28 May 2013 10:51
Last Modified: 04 Jul 2013 09:11

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