Isospin-symmetry breaking in superallowed Fermi β -decay due to isospin-nonconserving forces

Improved calculation of the isospin-symmetry-breaking corrections to superallowed Fermi β decay

We report new shell-model calculations of the isospin-symmetry-breaking correction δC to superallowed 0+ → 0+ nuclear β decay. The most important improvement is the inclusion of core orbitals, which are demonstrated to have a significant impact on the mismatch in the radial wave functions of the parent and daughter states. We determine which core orbitals are important to include from an examin...

Comparative tests of isospin - symmetry - breaking corrections to superallowed 0 + → 0 + nuclear β decay

We present a test with which to evaluate the calculated isospin-symmetry-breaking corrections to superallowed 0+ → 0+ nuclear β decay. The test is based on the corrected experimental F t values being required to satisfy conservation of the vector current (CVC). When applied to six sets of published calculations, the test demonstrates quantitatively that only one set, the one based on the shell ...

Isospin Symmetry Breaking

Isospin symmetry breaking

We discuss the separation of isospin-symmetric and isospin-breaking contributions in the hadronic observables within the framework of QCD plus QED. Further, we briefly review some recent work on the low-energy hadron phenomenology, in which the isospin-breaking effect plays a prominent role.

Isospin symmetry breaking in mirror nuclei

Isospin symmetry is one of the fundamental symmetries we can identify in nuclei. This is related to the approximate charge symmetry and charge independence of the strong interaction. On this hypothesis, the level schemes of mirror nuclei (with exchanged number of protons and neutrons) should be identical. Of course some differences appear due to the fact that the Coulomb interaction breaks isos...