Elemental technetium and promethium as cosmic-ray clocks

Details Elemental technetium and promethium as cosmic-ray clocks Elemental technetium and promethium as cosmic-ray clocks

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..237d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 1, 1987, p. 237-246.

Astronomy and Astrophysics

Astrophysics

3

Cosmic Rays, Half Life, Milky Way Galaxy, Promethium Isotopes, Radioactive Decay, Technetium Isotopes, Abundance, Nuclear Reactions, Stellar Composition

Scientific paper

The possibility of using elemental Tc (Z = 43) and Pm (Z = 61) as clocks to measure the mean cosmic-ray confinement time in the Galaxy, tau(epsilon) is considered. For this purpose it is necessary to estimate the unknown beta(+) decay half-lives of several Tc and Pm isotopes; these estimates are obtained using beta-decay systematics. In the case of Tc it is possible to estimate the half-lives sufficiently well and show that this element can indeed be used as a cosmic-ray clock; in the case of Pm the half-lives are too uncertain to permit any conclusion. In order to make meaningful measurement of tau(epsilon) using elemental Tc, a comsic-ray detector must have a charge resolution less than about 0.25e in the region around Tc, and enough collecting power to detect a few hundred Tc nuclei.

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