Abstract

Radioactive $^{40}\mathrm{Cl}$ was produced by the reaction $^{40}\mathrm{Ar}(n,p)^{40}\mathrm{Cl}$ through bombardment of a liquidargon target with 14.9-MeV neutrons. $\ensuremath{\gamma}$ rays were observed with 6-, 15-, and 35-cc Ge(Li) crystal detectors, and with two NaI(Tl) crystal detectors in coincidence. Twenty-three $\ensuremath{\gamma}$ rays with energies from 262 to 6334 keV were assigned to transitions in $^{40}\mathrm{Ar}$. The $\ensuremath{\beta}$-ray relative intensities were deduced from the relative intensities of the $\ensuremath{\gamma}$ rays, and $log\mathrm{ft}$ values were calculated. It was concluded that all levels in $^{40}\mathrm{Ar}$ up to and including the 3518-keV level have even parity. Seven levels from 3681 to 6335 keV in $^{40}\mathrm{Ar}$ have odd parity and spin of 1, 2, or 3. The ground energy level of $^{40}\mathrm{Cl}$ has spin-parity ${2}^{\ensuremath{-}}$, if in fact the 3681-keV level of $^{40}\mathrm{Ar}$ has spin-parity ${3}^{\ensuremath{-}}$.

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