Elemental technetium as a cosmic-ray clock

Details Elemental technetium as a cosmic-ray clock Elemental technetium as a cosmic-ray clock

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....3...29d&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 3 p 29-32 (SEE N85-34862 23-93)

Physics

Nuclear Physics

Atomic Clocks, Cosmic Rays, Radioactive Isotopes, Technetium, Confinement, Half Life, Mean Free Path, Nuclei (Nuclear Physics), Radioactive Decay

Scientific paper

Several radioactive isotopes have been proposed as clocks for the study of the mean cosmic ray confinement time, Te. Measurements of Be-10 and Al-26 give a value for Te of about 10 Myr when one uses a leaky box cosmic ray propagation model. It is important to obtain additional measurements of Te from other radioactive isotopes in order to check whether the confinement is the same throughout the periodic table. The possible use of Tc (Z = 43) as a cosmic clock is investigated. Since all isotopes of Tc are radioactive, one might be able to group these isotopes and use the elemental abundance as a whole. The results of the calculations are somewhat inconclusive for two reasons. First, the beta + decay half lives of two of the Tc isotopes relevant to our calculation are not known. Second, the dependence of the Tc abundance on the mean confinement time is rather weak when one considers the number of events expected in 4 trays of plastic track detectors. However, a future, finite measurement of the Beta + half lives and the possible use of the entire collecting area of the HNC to detect Tc nuclei could make the use of Tc as a cosmic ray clock more attractive.

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