Beta decay ofCl39

The β decay of ${}_{}{}^{39}{}_{}{}^{}\mathrm{Cl}$, produced in the ${}_{}{}^{37}{}_{}{}^{}\mathrm{Cl}$(t,p${)}^{39}$Cl reaction at $E_{\mathrm{t}}$=3.1 MeV, has been investigated with a Ge-NaI(Tl) Compton-suppression γ-ray spectrometer. Nineteen γ-ray transitions were observed, including 10 previously known. Precision energy measurements were carried out on six of the strongest lines. In the proposed decay scheme a weak new β-ray branch is established to the 2950-keV level of ${}_{}{}^{39}{}_{}{}^{}\mathrm{Ar}$, and the populations of ${}_{}{}^{39}{}_{}{}^{}\mathrm{Ar}$ levels at 2093 and 2433 keV are accounted for by γ-ray decays from higher excited states. Spin-parity assignments are given.