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• W2315700758 abstract "The $^{152}mathrm{Sm}(n, ensuremath{gamma})^{153}mathrm{Sm}$ spectrum was measured with the Argonne bent-crystal spectrometer and with a Ge(Li) detector at the in-pile facility at the Argonne CP-5 research reactor. The low-energy bent-crystal spectrum consisted of 251 $ensuremath{gamma}$ transitions associated with thermal-neutron capture in $^{152}mathrm{Sm}$, with energies between 28 and 1041 keV. The $ensuremath{gamma}$-ray intensities were normalized to the previously established intensity of the 103-keV line in $^{153}mathrm{Eu}$ from the $ensuremath{beta}$ decay of $^{153}mathrm{Sm}$. The energies and intensities of 24 other lines associated with this $ensuremath{beta}$ decay are also given. The high-energy ($n, ensuremath{gamma}$) spectrum, containing 23 lines between 4.5 and 5.9 MeV, was obtained with a Ge(Li) detector. The neutron binding energy of $^{153}mathrm{Sm}$ was found to be 5869.3ifmmodepmelsetextpmfi{}2.0 keV. The conversion-electron spectrum, measured with the high-resolution magnetic spectrometer at Munich, was used to obtain $K$ and $L$ conversion coefficients and corresponding multipole assignments for 37 of the low-energy $ensuremath{gamma}$ transitions. The $ensuremath{gamma}$ spectrum in $^{153}mathrm{Sm}$ following $ensuremath{beta}$ decay of $^{153}mathrm{Pm}$ was measured with Ge(Li) and Si(Li) detectors. The source was made at Darmstadt through the $^{154}mathrm{Sm}(ensuremath{gamma}, p)^{153}mathrm{Pm}$ reaction. The ($n, ensuremath{gamma}$), ($n, {e}^{ensuremath{-}}$), and $ensuremath{beta}$-decay experiments were combined to develop the level scheme of $^{153}mathrm{Sm}$, in which unique spin and parity assignments are made for 13 of the 28 levels below 750 keV. The energy (keV) and ${J}^{ensuremath{pi}}$ of the first 28 levels are: 0.000, ${frac{3}{2}}^{+}$; 7.535, ${frac{5}{2}}^{+}$; 35.843, ${frac{3}{2}}^{ensuremath{-}}$; 53.533, ${frac{7}{2}}^{+}$ or (${frac{5}{2}}^{+}$); 65.475, ${frac{9}{2}}^{+}$ or ${frac{7}{2}}^{+}$ or ${frac{5}{2}}^{+}$; 90.874, ${frac{5}{2}}^{ensuremath{-}}$; 112.954, ${frac{9}{2}}^{+}$ or ${frac{7}{2}}^{ifmmodepmelsetextpmfi{}}$ or ${frac{5}{2}}^{ifmmodepmelsetextpmfi{}}$; 127.298, ${frac{3}{2}}^{ensuremath{-}}$; 174.17, ${frac{7}{2}}^{ensuremath{-}}$; 182.90, ${frac{5}{2}}^{ensuremath{-}}$; (194.65), ${frac{5}{2}}^{ifmmodepmelsetextpmfi{}}$ or ${frac{7}{2}}^{+}$; 262.33, ${frac{7}{2}}^{+}$ or (${frac{5}{2}}^{+}$); (265.93), ${frac{7}{2}}^{ensuremath{-}}$ or (${frac{5}{2}}^{ifmmodepmelsetextpmfi{}}$); 276.71, ${frac{3}{2}}^{+}$; 321.11, ${frac{3}{2}}^{+}$; 356.69, ${frac{5}{2}}^{+}$; 362.29, ${frac{5}{2}}^{+}$; (371.04), $frac{9}{2}$ or $frac{7}{2}$; 405.46, ${frac{3}{2}}^{ensuremath{-}}$; 414.91, ${mathrm{textonehalf{}}}^{+}$ or ${frac{3}{2}}^{+}$; 447.07, $frac{5}{2}$ or $frac{7}{2}$; 450.04, $frac{5}{2}$ or $frac{7}{2}$; 481.08, ${frac{3}{2}}^{+}$; 524.36, $frac{5}{2}$; 630.20, ${frac{3}{2}}^{(ensuremath{-})}$; 695.83, ${mathrm{textonehalf{}}}^{(+)}$ or ${frac{3}{2}}^{(+)}$; 734.90, $frac{5}{2}$; and 750.32, textonehalf{} or $frac{3}{2}$. The parentheses around a level energy or spin assignment mean that this value is less well established or is less probable if there is a choice. Of special interest is the very low-energy (7.53 keV) first excited state with ${J}^{ensuremath{pi}}={frac{5}{2}}^{+}$, which appears to be the second member of the strongly distorted ground-state rotational band. A good match between the theoretical predictions of the Nilsson model and the observed $ensuremath{gamma}$-ray branching ratio was obtained when nine of the eleven levels below 200 keV were assigned to a positive-parity, $K=frac{3}{2}$, ground-state rotational band and two negative-parity, $K=frac{3}{2}$, rotational bands with band heads at 35.84 and 127.30 keV." @default.
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• W2315700758 date "1969-11-20" @default.
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• W2315700758 title "Level Scheme ofSm153Based on (n, γ), (n, e−), andβ-Decay Experiments" @default.
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• W2315700758 doi "https://doi.org/10.1103/physrev.187.1632" @default.
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