18-Ar-47

Atomic Mass: 46.9721862 ± 0.0001074 amu
Excess Mass: -25908.348 ± 100.086 keV
Binding Energy: 391178.159 ± 100.086 keV
Beta Decay Energy: B- 9788.539 ± 100.233 keV

Possible parent nuclides:

Beta from Cl-47