Abstract
The beta-decay energy ${Q}_{\ensuremath{\beta}}$ of the neutron-rich chlorine isotopes $^{40}$,42Cl produced by fragmentation of a tantalum target with a 2-\ensuremath{\mu}A proton beam has been determined. Energies of the beta transitions to bound levels in the daughter nuclei were measured by means of a scintillation telescope in singles or in coincidence with a high-efficiency Ge(Li) gamma counter. The $^{40}\mathrm{Cl}$ and $^{42}\mathrm{Cl}$ inferred experimental mass excesses, -27.72\ifmmode\pm\else\textpm\fi{}0.08 and -24.66\ifmmode\pm\else\textpm\fi{}0.22 MeV, respectively, are compared to mass predictions.
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