Precise measurement of branching ratios in thedecay of
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2015 American Physical Society. We present the full description of a measurement of the branching ratios for the decay of Ca38. This decay includes five allowed 0+1+ branches and a superallowed 0+0+ one. With our new result for the latter, we determine its ft value to be 3062.36.8 s, a result whose precision (0.2%) is comparable to the precision of the 13 well-known 0+0+ transitions used up until now for the determination of Vud, the up-down quark-mixing element of the Cabibbo-Kobayashi-Maskawa matrix. The Ca38 superallowed transition thus becomes the first addition to this set of transitions in nearly a decade and the first for which a precise mirror comparison is possible, thus enabling an improved test of the isospin-symmetry-breaking corrections required for the extraction of Vud.
author list (cited authors)
Park, H. I., Hardy, J. C., Iacob, V. E., Bencomo, M., Chen, L., Horvat, V., ... Towner, I. S.
complete list of authors
Park, HI||Hardy, JC||Iacob, VE||Bencomo, M||Chen, L||Horvat, V||Nica, N||Roeder, BT||McCleskey, E||Tribble, RE||Towner, IS