Experimental validation of the largest calculated isospin-symmetry-breaking effect in a superallowed Fermi decay.
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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.
author list (cited authors)
Melconian, D., Triambak, S., Bordeanu, C., Garca, A., Hardy, J. C., Iacob, V. E., ... Zhai, Y.
complete list of authors
Melconian, D||Triambak, S||Bordeanu, C||García, A||Hardy, JC||Iacob, VE||Nica, N||Park, HI||Tabacaru, G||Trache, L||Towner, IS||Tribble, RE||Zhai, Y