QEC-value determination for 21Na→21Ne and 23Mg→23Na mirror-nuclei decays using high-precision mass spectrometry with ISOLTRAP

Precision Q_EC values for the mirror β decays ²¹Na→²¹Ne and ²³Mg→²³Na, which test the weak interaction in nuclei that should be mirrors of each other.

ISOLTRAP high-precision mass spectrometry of the parent and daughter, so the mass difference is the decay energy. Mirror nuclei have swapped proton and neutron numbers.

Corrected ft values of superallowed and mirror decays constrain the CKM matrix element V_ud. A wrong Q-value is a wrong weak-interaction test. These two pairs are textbook mirrors.