Experimental validation of the largest calculated isospin-symmetry-breaking effect in a superallowed Fermi decay |
| |
Authors: | Melconian D Triambak S Bordeanu C García A Hardy J C Iacob V E Nica N Park H I Tabacaru G Trache L Towner I S Tribble R E Zhai Y |
| |
Institution: | Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA. dmelconian@physics.tamu.edu |
| |
Abstract: | A precision measurement of the γ yields following the β 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, δ(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. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|