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Contribution Poster solar

Poster (not participating in poster prize competition)

LOREX - Geochemical Detection of the pp-Neutrino flux with 205Tl


  • Prof. Miodrag PAVIĆEVIĆ
  • Prof. Yuri LITVINOV

Primary authors


Authorship annotation

for the LOREX Collaboration

Session and Location

Wednesday Session, Poster Wall #37 (Auditorium Gallery Right)

Abstract content

A geochemical determination of the Solar (pp) neutrino flux was proposed in 1970s [1]. The neutrino capture reaction 205Tl+ve→205Pb+e- has the low energy threshold of 52 keV. By measuring the amount of 205Pb in naturally occurring lorandite (TlAsS2) minerals, the LOREX (LORandite EXperiment) project [2] will provide the integral neutrino flux over the last 4.31(2) My, the age of lorandite [3]. The challenges are: (i) to determine the probability of neutrino capture on 205Tl; (ii) to mine a sufficient amount of lorandite and estimate background contributions; (iii) to chemically extract Pb; and (iv) finally to obtain the ratio of 205Pb/205Tl. Significant progress has been achieved for all four challenges. In this contribution we will report the status of the LOREX project and outline the future steps.

[1] M. Freedman et al., Science 193 (1976) 1117-1118

[2] M. Pavićević et al., Nucl. Instr. Meth. A 271 (1988) 287

[3] M. Pavićević et al., Nucl. Instr. Meth. A 895 (2018) 62

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