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Advances in High Energy PhysicsVolume 2012 2012, Article ID 274614, 15 pages

Research Article

Division of Material Sciences and Physics, Department of Mineralogy, University of Salzburg, Hellbrunner Street 34, 5020 Salzburg, Austria

GSI Helmholtzzentrum für Schwerionenforschung, Planck Straße 1, 64291 Darmstadt, Germany

Institute of Physics, University of Belgrade, Pregrevica 118, 11000 Belgrade, Serbia

Faculty of Mining and Geology, Goce Delčev University of Štip, Goce Delčev 89, 92000 Štip, Macedonia

Faculty of Mining and Geology, University of Belgrade, Đušina 7-II, 11000 Belgrade, Serbia

Physics Division, Argonne National Laboratory ANL, 9700 South Cass Avenue, Argonne, IL 60439, USA

Physics Department E12, Technical University of Munich, James-Franck Street, 85748 Garching, Germany

Max-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


Tl 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

Tl, 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

Pb atoms which strongly depends on the erosion rate of the lorandite-bearing rocks, 3 the capture probability of solar neutrinos by

Tl and 4 the extraction of lorandite and the appropriate technique to -count- the small number of

Pb atoms in relation to the number of

Tl 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

Pb atoms in lorandite.

Author: M. K. Pavićević, F. Bosch, G. Amthauer, I. Aničin, B. Boev, W. Brüchle, V. Cvetković, Z. Djurčić, W. F. Henning, R



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