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

摘要: Recent measurements of galactic radioactivity with the Compton Gamma Ray Observatory reported {sup 44}Ti activity from supernova remnant Cassiopeia A. The absolute amount provides a stringent test for current models. main uncertainty is presently half-life . We report new measurement applying novel technique using mixed radioactive ion beam containing as well 22}Na ions. This method allows reliable determination high accuracy, t{sub 1/2}=(60.3{plus_minus}1.3) yr abundance determined A this agrees theoretical predictions within observational uncertainties. {copyright} {ital 1998} American Physical Society}