Half-life of 44Ti as a probe for supernova models

被引：57
作者：
Gorres, J [1 ]
Meissner, J
Schatz, H
Stech, E
Tischhauser, P
Wiescher, M
Bazin, D
Harkewicz, R
Hellstrom, M
Sherrill, B
Steiner, M
Boyd, RN
Buchmann, L
Hartmann, DH
Hinnefeld, JD
机构：
[1] Univ Notre Dame, Notre Dame, IN 46556 USA
[2] Michigan State Univ, E Lansing, MI 48824 USA
[3] Ohio State Univ, Columbus, OH 43210 USA
[4] TRIUMF, Vancouver, BC V6T 2A3, Canada
[5] Clemson Univ, Clemson, SC 29634 USA
[6] Indiana Univ, South Bend, IN 46634 USA
来源：
PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 12期
关键词：
D O I：
10.1103/PhysRevLett.80.2554
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Recent measurements of galactic radioactivity with the Compton Gamma Ray Observatory reported Ti-44 activity from the supernova remnant Cassiopeia A. The absolute amount of Ti-44 provides a stringent test for current supernova models. The main uncertainty is presently the half-life of Ti-44. We report a new measurement of the half-life of Ti-44 applying a novel technique using a mixed radioactive ion beam containing Ti-44 as well as Na-22 ions. This method allows the reliable determination of the half-life of Ti-44 With high accuracy, t(1/2) = (60.3 +/- 1.3) yr. The Ti-44 abundance determined for Cassiopeia A with this half-life agrees with theoretical predictions within the observational uncertainties.
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收藏
页码：2554 / 2557
页数：4
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