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Advances in High Energy Physics
Volume 2012, Article ID 274614, 15 pages
Research Article

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

1Division of Material Sciences and Physics, Department of Mineralogy, University of Salzburg, Hellbrunner Street 34, 5020 Salzburg, Austria
2GSI Helmholtzzentrum für Schwerionenforschung, Planck Straße 1, 64291 Darmstadt, Germany
3Institute of Physics, University of Belgrade, Pregrevica 118, 11000 Belgrade, Serbia
4Faculty of Mining and Geology, Goce Delčev University of Štip, Goce Delčev 89, 92000 Štip, Macedonia
5Faculty of Mining and Geology, University of Belgrade, Đušina 7/II, 11000 Belgrade, Serbia
6Physics Division, Argonne National Laboratory (ANL), 9700 South Cass Avenue, Argonne, IL 60439, USA
7Physics Department E12, Technical University of Munich, James-Franck Street, 85748 Garching, Germany
8Max-Planck Institute for Astrophysics, Karl-Schwarzschild Street 1, 85741 Garching, Germany

Received 21 August 2012; Revised 19 October 2012; Accepted 2 November 2012

Academic Editor: Bogdan Mitrica

Copyright © 2012 M. K. Pavićević et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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).