Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2007-01-30
Phys.Rev.C75:055502,2007
Physics
Nuclear Physics
Nuclear Theory
18 pages, 2 figures, submitted to Phys. Rev. C
Scientific paper
10.1103/PhysRevC.75.055502
The rate for the photon emission accompanying orbital 1S electron capture by the atomic nucleus is recalculated. While a photon can be emitted by the electron or by the nucleus, the use of the length gauge significantly suppresses the nuclear contribution. Our calculations resolve the long standing discrepancy of theoretical predictions with experimental data for $\Delta J=2$ forbidden transitions. We illustrate the results by comparison with the data established experimentally for the first forbidden unique decays of $^{41}$Ca and $^{204}$Tl.
Jentschura Ulrich D.
Pachucki Krzysztof
Pf"utzner M.
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