Kinematic Factors for Beta and Double Beta Decay

Le résumé fourni par la source

Precise theoretical calculation of the nuclear matrix elements (NME) and phase space factors (PSFs) are essential for predicting and interpreting data in double beta decay (DBD) experiments. In particular, from PSFs one can derive predictions of the electron energy spectra and angular correlations that can be used for detector calibration, background characterization, and differen tiation between double beta decay modes. In this work, we provide updated values of PSFs for the (2𝜈𝛽−𝛽−) mode for transitions from ground states to ground and excited 0+ and 2+ states, for a large number of isotopes. The calculations are performed with an adapted Dirac-Hartree-Fock Slater method, which allows accurate treatment of the electron wave functions and includes key atomic features like screening, finite nuclear size, exchange corrections, and phase shift effects.

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