Two neutrino double beta decay within the -approximation
Abstract
We examine the contributions of odd-parity nuclear operators to the two-neutrino double beta decay 0+→ 0+ amplitude, which come from the P-wave Coulomb corrections to the electron wave functions and the recoil corrections to the nuclear currents. Although they are formally of higher order in α Z/2 or v/c of the nucleon than the usual Fermi and Gamow-Teller matrix elements, explicit calculations performed within the QRPA show that they are significant when confronted with the experimental data.
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