Precise branching ratio measurement for the superallowed decay of : Completion of a second mirror pair
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2019 American Physical Society. As part of a continuing effort to test the unitarity of the Cabbibo-Kobayashi-Maskawa matrix, we have measured the branching ratio for the superallowed 0+0++-decay transition from Si26 to be 0.7569(14), a result with 0.18% relative precision. With this result, the ft value for the transition is now established with comparable precision to the well-known superallowed transitions currently used in the determination of Vud. It also completes a second pair of mirror superallowed transitions, Si26 Al26m and Al26m Mg26, the ratio of whose measured ft values provides a sensitive test of the method used to calculate the isospin-symmetry-breaking correction C needed to determine Vud. Like the previously measured ratio for the mass-38 mirror pair, the new result agrees well with the calculation based on Woods-Saxon radial wave functions and strengthens the case for rejecting the calculation that uses Hartree-Fock radial functions.
author list (cited authors)
Bencomo, M., Hardy, J. C., Iacob, V. E., Park, H. I., Chen, L., Horvat, V., ... Towner, I. S.
complete list of authors
Bencomo, M||Hardy, JC||Iacob, VE||Park, HI||Chen, L||Horvat, V||Nica, N||Roeder, BT||Saastamoinen, A||Towner, IS