Publikationen

Settling the Half-Life of Fe-60: Fundamental for a Versatile Astrophysical Chronometer

Autor(en)
Anton Wallner, M. Bichler, K. Buczak, R. Dressler, L. K. Fifield, D. Schumann, J. H. Sterba, S. G. Tims, G. Wallner, Walter Kutschera
Abstrakt

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.

Organisation(en)
Isotopenphysik, Institut für Anorganische Chemie
Externe Organisation(en)
Technische Universität Wien, Paul Scherrer Institute, Australian National University
Journal
Physical Review Letters
Band
114
Anzahl der Seiten
6
ISSN
0031-9007
DOI
https://doi.org/10.1103/PhysRevLett.114.041101
Publikationsdatum
01-2015
Peer-reviewed
Ja
ÖFOS 2012
103014 Kernphysik, 104017 Physikalische Chemie, 104003 Anorganische Chemie
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/settling-the-halflife-of-fe60-fundamental-for-a-versatile-astrophysical-chronometer(322d91ef-f39a-4f6b-8e0f-093da1bf7514).html