Precision half-life determination for the β⁺ emitter ¹³N

A new precision half-life measurement of ¹³N has been conducted using the TwinSol β-counting station at the University of Notre Dame. The measured value of t^new_1/2=597.05(19) s differs from the previous world value by about 2.8σ. An evaluation of the ¹³N half-life results in a t^world_1/2=597.19(22) s. Updated standard model predictions for the Fermi to Gamow-Teller mixing ratio ρ and its associated correlation parameters have been calculated using the new ¹³N world half-life in preparation for a future measurement of the mixing ratio. Finally, an ab initio no-core configuration interaction (NCCI) calculation for the $B(GT)$ of this decay, carried out using the Daejeon16 interaction, has been performed, revealing the need for higher-order chiral corrections.