Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.041101
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Funding
- Austrian Science Fund (FWF) [AP20434, AI00428]
- Austrian Science Fund (FWF) [W1210] Funding Source: Austrian Science Fund (FWF)
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In order to resolve a recent discrepancy in the half-life of Fe-60, we performed an independent measurement with a new method that determines the Fe-60 content of a material relative to Fe-55 (t(1/2) = 2.744 yr) with accelerator mass spectrometry. Our result of (2.50 +/- 0.12) x 10(6) yr clearly favors the recently reported value (2.62 +/- 0.04) x 10(6) yr, and rules out the older result of (1.49 +/- 0.27) x 10(6) yr. The present weighted mean half-life value of (2.60 +/- 0.05) x 10(6) yr substantially improves the reliability as an important chronometer for astrophysical applications in the million-year time range. This includes its use as a sensitive probe for studying recent chemical evolution of our Galaxy, the formation of the early Solar System, nucleosynthesis processes in massive stars, and as an indicator of a recent nearby supernova.
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