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

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

2011-01-05

arxiv.org/abs/1101.0939v2

Phys.Rev.Lett.106:132502,2011

Physics

Nuclear Physics

Nuclear Theory

4 pages, 2 figures; replaced with accepted version

Scientific paper

10.1103/PhysRevLett.106.132502

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, |V_{ud}|= 0.97447(23), agrees well with the recent result by Towner and Hardy [Phys. Rev. C {\bf 77}, 025501 (2008)].

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