Neutrinoless Double β⁺/EC Decays

Figure 11

Negative of the ratio between the Gamow-Teller and Fermi NMEs for0𝜈𝛽⁻𝛽⁻and0𝜈𝛽⁺/EC decays for masses70≤𝐴≤100(a) and for104≤𝐴≤136(b). Shown are the ratios corresponding to the decay transitions to the ground state (0⁺_gs) and the first excited0⁺state (0⁺₁).

(a)

(b)