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- W2271308040 abstract "A detailed magnetic spectrometer study was made of the shape of the beta-ray spectrum in the decay of ${mathrm{Ca}}^{47}$. It was definitely established that the highest energy transition does not have a once forbidden unique shape and, therefore, that a $frac{3}{2}+$ assignment to the ground state of ${mathrm{Ca}}^{47}$ is not possible. The ground-state to ground-state transition of 1.979ifmmodepmelsetextpmfi{}0.005 MeV is probably from a $frac{7}{2}ensuremath{-}$ initial to a $frac{7}{2}ensuremath{-}$ final state with an abnormally high comparative half-life ($logft=8.5$) possibly resulting from distortion of the ${mathrm{Ca}}^{47}$ nucleus. Evidence was found for a beta transition to the first excited state of ${mathrm{Sc}}^{47}$. This appears to be a twice forbidden transition from $frac{7}{2}ensuremath{-}$ to $frac{3}{2}ensuremath{-}$ with an energy of 1.486ifmmodepmelsetextpmfi{}0.010 MeV and an intensity of 1.3-1.8%. The comparative half-life for this $ensuremath{Delta}I=2$, no transition is relatively short with $logft=9.0$. The beta transition to the second excited state of ${mathrm{Sc}}^{47}$ has an energy of 0.671ifmmodepmelsetextpmfi{}0.010 MeV. The relative intensity is 82.4% and $logft=6.0$. The observations are consistent with an assignment $frac{7}{2}ensuremath{-}$ to $frac{5}{2}ensuremath{-}$. The energies of the three gamma rays that follow the decay of ${mathrm{Ca}}^{47}$ were measured with a NaI(Tl) detector and 400-channel analyzer. The energies were found to be 1.308ifmmodepmelsetextpmfi{}0.005, 0.815ifmmodepmelsetextpmfi{}0.005, and 0.493ifmmodepmelsetextpmfi{}0.010 MeV. The half-life for the beta decay was measured in the magnetic spectrometer and found to be 4.7ifmmodepmelsetextpmfi{}0.1 days." @default.
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- W2271308040 date "1963-12-15" @default.
- W2271308040 modified "2023-10-14" @default.
- W2271308040 title "Beta Spectrum ofCa47" @default.
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- W2271308040 doi "https://doi.org/10.1103/physrev.132.2616" @default.
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