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- W2078009241 startingPage "B1464" @default.
- W2078009241 abstract "Using the Doppler-broadened 4.43-MeV gamma line from the reaction ${mathrm{N}}^{15}(p,ensuremath{alpha}){mathrm{C}}^{12*}$, the 4.403-MeV level in ${mathrm{Al}}^{27}$ has been excited by resonant absorption. The de-excitation of this level was found to lead to the 2.21-MeV (11%) and the 1.01-MeV (32%) excited states as well as directly to the ground state of ${mathrm{Al}}^{27}$ (57%). From a self-absorption study, a value $g{ensuremath{Gamma}}_{0}=0.24ifmmodepmelsetextpmfi{}0.03$ eV was obtained for the product of the statistical factor $g=frac{(2{J}_{mathrm{exc}}+1)}{(2{J}_{mathrm{gs}}+1)}$ and the partial width ${ensuremath{Gamma}}_{0}$ of the ground-state transition. The angular distribution of the 4.403-MeV resonance radiation was observed to be $W(ensuremath{theta})=1+(0.30ifmmodepmelsetextpmfi{}0.05) {P}_{2}(cosensuremath{theta})$, and that of the 3.39-MeV radiation to the 1.01-MeV state $W(ensuremath{theta})=1ensuremath{-}(0.24ifmmodepmelsetextpmfi{}0.12) {P}_{2}(cosensuremath{theta})$. Of the possible spin-parity assignments, only ${frac{5}{2}}^{ifmmodepmelsetextpmfi{}}$ and ${frac{7}{2}}^{+}$ are compatible with the observed widths and the angular distributions, the most probable assignment being ${frac{5}{2}}^{+}$, the least probable ${frac{7}{2}}^{+}$. With a spin of $frac{5}{2}$, the partial width for the 4.403-MeV ground-state transition becomes ${ensuremath{Gamma}}_{0}=(0.24ifmmodepmelsetextpmfi{}0.03)$ eV, and the total width of the level $ensuremath{Gamma}=(0.42ifmmodepmelsetextpmfi{}0.06)$ eV. The fact that resonance scattering from the 4.504-MeV level was not observed points to a spin of either textonehalf{} or $ensuremath{ge}frac{9}{2}$ for that level." @default.
- W2078009241 created "2016-06-24" @default.
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- W2078009241 date "1965-09-20" @default.
- W2078009241 modified "2023-09-25" @default.
- W2078009241 title "Properties of the 4.403-MeV Excited State ofAl27" @default.
- W2078009241 cites W1969631129 @default.
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- W2078009241 doi "https://doi.org/10.1103/physrev.139.b1464" @default.
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