Two neutrino double beta decay within the $\xi$-approximation

Abstract

We examine the contributions of odd-parity nuclear operators to the two-neutrino double beta decay $0^{+}\to 0^{+}$ 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.

9 pages, latex, no figures

References in corpus (6)

• Majorons Without Majorana Masses and Neutrinoless Double Beta Decay
• A New Class of Majoron-Emitting Double-Beta Decays
• First-Forbidden beta decay: Medium enhancement of the axial charge at A=16
• Double Beta Decay in pn-QRPA Model with Isospin and SU(4) Symmetry Constraints
• Projected Linear Response Theory for Charge-Exchange Excitations and Double Beta Decay
• General Behavior of Double Beta Decay Amplitudes in the Quasiparticle Random Phase Approximation

Cited by in corpus (5)

• Double Beta Decay
• Double beta decay of sigma^- hyperons
• A Nuclear Structure Model for Double Charge-Exchange Processes
• Competition between standard and exotic double beta decays
• Weak Magnetism in Two Neutrino Double Beta Decay