The energy of the 5.3-MeV gamma ray produced in the beta decay of ${\mathrm{C}}^{15}$ was measured with a lithiumdrifted germanium detector. An energy of 5.301±0.005 MeV was found. This value is in agreement with the value of 5.299±0.006 MeV found by Alburger, Gallmann, and Wilkinson and verifies the basis of their arguments for the assignment of ${\mathrm{½}}^{+}$ for the spin and parity of the ground state of ${\mathrm{C}}^{15}$. The techniques used in the gamma-ray energy determination are discussed in detail.

• Received 9 July 1964

DOI:https://doi.org/10.1103/PhysRev.136.B913