Two neutrino double beta decay within the $ξ$-approximation

Details Two neutrino double beta decay within the $ξ$-approximation Two neutrino double beta decay within the $ξ$-approximation

1994-12-09

arxiv.org/abs/nucl-th/9412015v1

Phys. Lett. B345 (1995) 192-196

Physics

Nuclear Physics

Nuclear Theory

9 pages, latex, no figures

Scientific paper

10.1016/0370-2693(94)01592-Z

We examine the contributions of odd-parity nuclear operators to the two-neutrino double beta decay $0^+\rightarrow 0^+$ 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 $\alpha Z/2$ 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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