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- W3100795833 abstract "The average-resonance method of neutron-capture $ensuremath{gamma}$-ray spectroscopy is critically examined by means of measurements on stable isotopes of palladium, gadolinium, holmium, and erbium. A mathematical model of the capture process is developed. This model shows that the intensities of the lines in average-resonance-capture spectra can yield the parities and set narrow limits on the spins of states in almost all nuclides with $A>100$ if the $ensuremath{gamma}$-ray strength function is a smooth function of $ensuremath{gamma}$-ray energy and if the random fluctuations in intensity result only from the Porter-Thomas distribution of partial radiation widths. The measurements give extensive data for $^{106}mathrm{Pd}$, $^{156}mathrm{Gd}$, $^{158}mathrm{Gd}$, $^{166}mathrm{Ho}$, and $^{168}mathrm{Er}$, and some for $^{103}mathrm{Pd}$, $^{105}mathrm{Pd}$, $^{155}mathrm{Gd}$, $^{157}mathrm{Gd}$, $^{165}mathrm{Er}$, $^{167}mathrm{Er}$, and $^{169}mathrm{Er}$. These data are examined for information relating to the mechanisms of radiative capture. All of the data are consistent with the hypothesis that the radiation widths are a smooth function of $ensuremath{gamma}$-ray energy and that the random fluctuations in intensity are well described by the Porter-Thomas distribution. The intensities of $E1$ transitions vary with $ensuremath{gamma}$-ray energy more rapidly than $E_{ensuremath{gamma}}^{}{}_{}{}^{3}$, as expected from a giant-resonance description of the radiative process. The intensity of $M1$ radiation was measured over a 2-MeV range for $^{106}mathrm{Pd}$ and $^{168}mathrm{Er}$, and the reduced $M1$ widths for $^{106}mathrm{Pd}$ form a giant-resonance-like curve that peaks at ensuremath{sim}7.8 MeV. Ratios of widths for $E1$ and $M1$ radiation and for $E1$ and $E2$ radiation are obtained for several nuclides. These properties of radiative capture are used to obtain spectroscopic information about final states. The most complete results are for $^{166}mathrm{Ho}$, for which 16 rotational bands are identified and interpreted in terms of the collective model. Similar but less extensive data are obtained for $^{156}mathrm{Gd}$, $^{158}mathrm{Gd}$, and $^{168}mathrm{Er}$. The measurements on $^{106}mathrm{Pd}$ show that the shapes of the observed $ensuremath{gamma}$-ray lines may be used to determine the parities of final states." @default.
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- W3100795833 title "Average-Resonance Method of Neutron-Captureγ-Ray Spectroscopy: States ofPd106,Gd156,Gd158,Ho166, andEr168" @default.
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