On the half-life of 44Ti by results in meteorites.

Details On the half-life of 44Ti by results in meteorites. On the half-life of 44Ti by results in meteorites.

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ncimc..20..955b&link_type=abstract

Nuovo Cimento C, Vol. 20C, N. 6, p. 955 - 959

Physics

Cosmic Rays: Meteorites, Cosmic Rays: Titanium

Scientific paper

Measurements of the 44Ti half-life display a large spread ranging from 46.4 to 66.6 years. The activity of this radioisotope measured in eight meteorites (chondrites) that fell in the time interval 1883 - 1992 and calculated at the time of fall by the different values of T1/2 shows that the shorter values are not reliable, if it is assumed that the average cosmic-ray intensity has remained the same during the past two centuries. The low activity of the cosmogenic isotope 44Ti has been determined by means of a selective Ge-NaI (Tl) γ-spectrometer with a very low background. The high stability of this system allows long-lasting runs (≡ 107s), in order to achieve the standard deviation of counting up to 10%.

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