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- W1566230721 abstract "Total neutron cross sections were measured for natural rubidium and thallium and for the separated isotopes, Pb208, Pb207, Pb206, Tl203, and Rb85. Approximate s-wave resonance spacings were estimated for Pb207, Y89, Rb87, Rb85, Tl203, and Tl205. D0 = DJ(2J + 1) = 2DS(2I + 1) = 50, 24, 8, 4, and 30 kev, respectively, where Ds is the average (s-wave) level spacing for all channels. The spacings (D0) of Pb206 and Pb208 were found to be of the order of hundreds of kew; there is also evidence that resonance spacings are very wide for Sr86 and Ba136. It is concluded that, in all compound nuclei with a neutron number silightly less than the magic numbers 50, 82, and 126, the resonance spacings are usually not much less than when the magic number is exceeded slightly. Since neutron excitation energies of these sub-magic nuclei are higher than the average, the observed wide level spacings below the magic numbers must be due to the properties of the nearly closed shells and can not possibly be caused only by low excitation energy of the compound nucleus. In considering these comparisons it is shown that, for s-wave resonances, the relation DJ = D0(2J + 1) is a useful approximation in that a plot of D0 is a much less erratic function of A than is the observed spacing. We also discuss the Bethe-Hurwitz effect, i.e., the influence on resonance spacing (apart from the 2J + 1 factor) of an unpaired nucleon in the target nucleus. We estimate that α ≧ 30 in the equation D0(0)D0(W) = exp (αW)12 where D0(0) is the energy and spin independent spacing parameter, and W is the excitation energy of the compound nucleus." @default.
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- W1566230721 date "1961-01-01" @default.
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- W1566230721 title "s- and p-wave neutron spectroscopy" @default.
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- W1566230721 doi "https://doi.org/10.1016/0003-4916(61)90061-6" @default.
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