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

A new precision half-life measurement of 13N has been conducted using the TwinSol n-counting station at the University of Notre Dame. The measured value of t1/2new = 597.05(19) s differs from the previous world value by about 2.8 sigma. An evaluation of the 13N half-life results in a tworld 1/2 = 597.19(22) s. Updated standard model predictions for the Fermi to Gamow-Teller mixing ratio rho 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.

Automated summary

A new precision measurement of the half-life of 13N has been conducted, revealing a difference from the previous world value. This measurement provides updated predictions for the Fermi to Gamow-Teller mixing ratio and highlights the need for higher-order chiral corrections.