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Phys. Rev. Lett. 80, 2554 - 2557 (1998)

Half-Life of 44Ti as a Probe for Supernova Models

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J. Görres1, J. Meißner1 *, H. Schatz1, E. Stech1, P. Tischhauser1, M. Wiescher1, D. Bazin2, R. Harkewicz2, M. Hellström2 †, B. Sherrill2, M. Steiner2, R. N. Boyd3, L. Buchmann4, D. H. Hartmann5, and J. D. Hinnefeld6
1University of Notre Dame, Notre Dame, Indiana 46556
2Michigan State University, East Lansing, Michigan 48824
3The Ohio State University, Columbus, Ohio 43210
4TRIUMF, Vancouver, Canada V6T 2A3
5Clemson University, Clemson, South Carolina 29634
6Indiana University South Bend, South Bend, Indiana 46634

Featured in Phys. Rev. Focus Received 22 October 1997

Recent measurements of galactic radioactivity with the Compton Gamma Ray Observatory reported 44Ti activity from the supernova remnant Cassiopeia A. The absolute amount of 44Ti provides a stringent test for current supernova models. The main uncertainty is presently the half-life of 44Ti. We report a new measurement of the half-life of 44Ti applying a novel technique using a mixed radioactive ion beam containing 44Ti as well as 22Na ions. This method allows the reliable determination of the half-life of 44Ti with high accuracy, t1/2  =  (60.3±1.3) yr. The 44Ti abundance determined for Cassiopeia A with this half-life agrees with theoretical predictions within the observational uncertainties.


©1998 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.80.2554
DOI: 10.1103/PhysRevLett.80.2554
PACS: 21.10.Tg, 26.50.+x, 27.40.+z, 29.25.Rm

* Present address: Ion Beam Applications S.A., Louvain-la-Neuve, Belgium.
† Present address: Gesellschaft für Schwerionenforschung, Darmstadt, Germany.

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