f t value of the 0(+)-> 0(+) beta(+) decay of Ar-32: A measurement of isospin symmetry breaking in a superallowed decay Academic Article uri icon


  • We determined the absolute branch of the T=2 superallowed decay of Ar32 by detecting the +-delayed protons and decays of the daughter state. We obtain bSA=(22.710.16)%, which represents the first determination of a proton branch to better than 1%. Using this branch along with the previously determined Ar32 half-life and energy release, we determined ft=(155212) s for the superallowed decay. This ft value, together with the corrected Ft value extracted from previously known T=1 superallowed decays, yields a measurement of the isospin symmetry breaking correction in Ar32 decay Cexp=(2.10.8)%. This can be compared to a theoretical calculation C=(2.00.4)%. As by-products of this work, we determined the and proton branches for the decay of the lowest T=2 state of Cl32, made a precise determination of the total proton branch and relative intensities of proton groups that leave S31 in its first excited state and deduced an improved value for the Cl32 mass. 2008 The American Physical Society.

published proceedings


author list (cited authors)

  • Bhattacharya, M., Melconian, D., Komives, A., Triambak, S., Garcia, A., Adelberger, E. G., ... Wiedeking, M.

citation count

  • 43

complete list of authors

  • Bhattacharya, M||Melconian, D||Komives, A||Triambak, S||Garcia, A||Adelberger, EG||Brown, BA||Cooper, MW||Glasmacher, T||Guimaraes, V||Mantica, PF||Oros-Peusquens, AM||Prisciandaro, JI||Steiner, M||Swanson, HE||Tabor, SL||Wiedeking, M

publication date

  • June 2008