0+→0−beta decay ofC16

Abstract
The beta decay of C16 to N16(0, 120 keV) has been observed. The branching ratio is (0.680.11+0.09)% and the log f0t=6.700.05+0.07. The rate of this 0+0 transition is dominated by the time component of the axial-vector current, which is expected to receive a large enhancement from pion-exchange currents. An upper limit of N16(1, 398 keV).
Keywords