In-flight annihilation corrections are considered to the energy spectrum shape measurement of ${}_{}{}^{12}{}_{}{}^{}\mathrm{N}$. Owing to this correction the slope measured to be (-0.17 ± 0.06)%/MeV may extend to -0.35%/MeV. This is to be compared with a slope of (-0.52 ± 0.02)%/MeV predicted if conserved vector current is assumed.

RADIOACTIVITY ${}_{}{}^{12}{}_{}{}^{}\mathrm{N}$; correction to spectrum-shape measurements, implication on CVC.

• Received 7 December 1976

DOI:https://doi.org/10.1103/PhysRevC.15.1587