Precise branching ratio measurement for the superallowed β+ decay of Si26 : Completion of a second mirror pair

Superallowed \ensuremath{\beta}decay is an important tool in characterizing the vector component of the weak interaction. Precise \ensuremath{\beta}decay results presently give the best measurement of the up-down quark weak-mixing element, {V}_{u\phantom{\rule{0}{0ex}}d} This new result completes the measurement of a second set of superallowed mirror transitions ({}^{26}i-{}^{26m}l and {}^{26m}l-{}^{26}g in this case) and...