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- W93670241 startingPage "1675" @default.
- W93670241 abstract "Conversion coefficients and probable multipolarities were measured for seven $ensuremath{gamma}$ rays from levels of $^{239}mathrm{Np}$ populated by the $ensuremath{alpha}$ decay of $^{243}mathrm{Am}$. The $ensuremath{gamma}$ energies in keV and their multipolarities are 43.1 keV ($M1+E2$), 55.4 keV ($M1+E2$), 74.7 keV ($E1$), 86.7 keV ($E1$), 98.5 keV ($E2$), 117.8 keV ($E1$), and 142.0 keV ($E1$). The multipolarities of the 74.7- and 117.8-keV $ensuremath{gamma}'mathrm{s}$ have been previously reported. The 98.5-keV transition was seen only in ${e}^{ensuremath{-}}$ spectra and has not been noted before. These multipolarities are in agreement with level-spin assignments. Gamma branching ratios from the 74.7-, 117.8-, and 173.2-keV levels have been calculated. Coincidences with $ensuremath{alpha}'mathrm{s}$ were required in order to eliminate radiations from the ${ensuremath{beta}}^{ensuremath{-}}$ decay of the $^{239}mathrm{Np}$ daughter. The 100-${mathrm{mm}}^{2}$ifmmodetimeselsetexttimesfi{}3-mm-deep Si(Li) detector gave an ${e}^{ensuremath{-}}$ resolution of 2.0 keV over the energy range studied. Both the detector and the field-effect transistor input stage were cooled to -150ifmmode^circelsetextdegreefi{}C." @default.
- W93670241 created "2016-06-24" @default.
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- W93670241 date "1969-05-20" @default.
- W93670241 modified "2023-09-23" @default.
- W93670241 title "Am243αDecay: Multipolarity ofγTransitions" @default.
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- W93670241 doi "https://doi.org/10.1103/physrev.181.1675" @default.
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