Microscopic calculations of isospin-breaking corrections to superallowed beta-decay

الأصل · EN

The superallowed beta-decay rates that provide stringent constraints on physics beyond the Standard Model of particle physics are affected by nuclear structure effects through isospin-breaking corrections. The self-consistent isospin- and angular-momentum-projected nuclear density functional theory is used for the first time to compute those corrections for a number of Fermi transitions in nuclei from A=10 to A=74. The resulting leading element of the CKM matrix, |Vud|= 0.97447(23), agrees well with the recent result by Towner and Hardy [Phys. Rev. C 77, 025501 (2008)].