Cosmogenic Ti-44 in meteorites and century scale solar modulation

Details Cosmogenic Ti-44 in meteorites and century scale solar modulation Cosmogenic Ti-44 in meteorites and century scale solar modulation

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994adspr..14..783b&link_type=abstract

Advances in Space Research, vol. 14, no. 10, p. 783-786

Physics

5

Galactic Cosmic Rays, Gamma Ray Spectrometers, Meteorites, Solar Cycles, Titanium, Cosmochemistry, Cosmology, Flux (Rate), Radioactive Decay

Scientific paper

The Galactic Cosmic Ray (GCR) flux is modulated by solar activity: 11 and 22 year cycles are well established. Meteorites offer the possibility of studying longer cycles in the interplanetary space, due to GCR nuclear interactions. Ti-44 cosmogenic isotope produced in meteorites is suitable for detecting a century scale modulation. So far reliable measurements of Ti-44 in the samples are scarce, the radioisotope concentration being very low. A gamma-ray sensitive spectrometer has been set up in the underground laboratory of Monte dei Cappuccini. The system consists of a 2 kg HPGe detector inside a 28 kg NaI well. The system has a background of approximately 1 count/day (in coincidence mode) in the Ti-44 region. We present here the results obtained on the Rio Negro meteorite, which fell in the year 1934.

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