Experimental validation of the largest calculated isospin-symmetry-breaking effect in a superallowed Fermi decay. Academic Article uri icon


  • A precision measurement of the yields following the decay of (32)Cl has determined its isobaric-analogue branch to be (22.47(-0.18)(+0.21))%. Since it is an almost pure-Fermi decay, we can also determine the amount of isospin-symmetry breaking in this superallowed transition. We find a very large value, (C) = 5.3(9)%, in agreement with a shell-model calculation. This result sets a benchmark for isospin-symmetry-breaking calculations and lends support for similarly calculated, yet smaller, corrections that are currently applied to 0+ 0 + transitions for tests of the standard model.

published proceedings

  • Phys Rev Lett

author list (cited authors)

  • Melconian, D., Triambak, S., Bordeanu, C., Garca, A., Hardy, J. C., Iacob, V. E., ... Zhai, Y.

citation count

  • 20

complete list of authors

  • Melconian, D||Triambak, S||Bordeanu, C||GarcĂ­a, A||Hardy, JC||Iacob, VE||Nica, N||Park, HI||Tabacaru, G||Trache, L||Towner, IS||Tribble, RE||Zhai, Y

publication date

  • October 2011