Precise half-life measurement of the superallowed β+ emitter 38Ca
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The half-life of 38Ca, a TZ=-1 superallowed 0 +→0+β+ emitter, has been measured to be 443.77(36) ms. In our experiment, pure sources of 38Ca were produced and the decay positrons were detected in a high-efficiency 4π proportional gas counter. Since the β+ decay of 38Ca feeds 38Km, which is itself a superallowed β+ emitter, the data were analyzed as a linked parent-daughter decay. Our result, with a precision of 0.08%, is a factor of 5 improvement on the best previous result. © 2011 American Physical Society.
author list (cited authors)
Park, H. I., Hardy, J. C., Iacob, V. E., Banu, A., Chen, L., Golovko, V. V., ... Tribble, R. E.