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- W3201156965 abstract "The ${ensuremath{beta}}^{+}$ decay of $^{47}mathrm{Cr}$ (${J}^{ensuremath{pi}}$,T${=(3/2)}^{mathrm{ensuremath{-}}}$,(1/2)) has been studied following its production by the $^{9}mathrm{Be}$${(}^{40}$Ca, 2n${)}^{47}$Cr reaction at E${(mathrm{}}^{40}$Ca)ensuremath{approxeq}90 MeV. In addition to the previously reported superallowed decay to the mirror state (i.e., the $^{47}mathrm{V}$ ground state), we observe a (3.7ifmmodepmelsetextpmfi{}1.2)% allowed ${ensuremath{beta}}^{+}$ branch to the ${(5/2)}^{mathrm{ensuremath{-}}}$ state at 87 keV in $^{47}mathrm{V}$. These two branches appear to dominate the decay of $^{47}mathrm{Cr}$; an upper limit of less than 0.5% is set on possible ensuremath{gamma} rays, other than the 87-keV ensuremath{gamma} ray, in the range of 15 to 2800 keV. Measurement of the time decay of the 87-keV ensuremath{gamma} ray establishes a value of ${T}_{1/2}$=508ifmmodepmelsetextpmfi{}10 ms for the $^{47}mathrm{Cr}$ half-life which is in significant disagreement with two previously reported values. The present work utilized Ge spectroscopy and a He-jet system for transport of the beam-induced radioactivity, as opposed to previous measurements which used a plastic scintillator to detect positrons and either a He-jet chopper or a slow beam-pulsing system. A summary of decay data for the complete ${f}_{7/2}$ shell series of mirror nuclei is also presented." @default.
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- W3201156965 doi "https://doi.org/10.1103/physrevc.31.1490" @default.
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