Slow Neutron Velocity Spectrometer Studies I. Cd, Ag, Sb, Ir, Mn

Rainwater, L.J.; Havens, W.W.; Wu, C. S.; Dunning, J. R.

doi:10.1103/physrev.71.65

Cited by 81 publications

(7 citation statements)

References 13 publications

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“…To aid in such a separation, the hypothetical curve shown in Fig. 2 of the line so obtained is given by <r= (8.7+2.31E~*), which agrees well in slope and intercept with reported data 8,9 for Mn and F. For simplicity, we assume that there is no loss of coherent scattering in the hypothetical curve up to 5.46A, the cut-off wave-length for Bragg reflections for MnFa. 10 Beyond the cut-off the equation of the curve is given by a-(1.0-f 2.31E"*); the assumed residual incoherent scattering cross section of 1.0 barn appears to be a justifiable approximation on the basis of other studies carried out here.…”

supporting

confidence: 70%

The Scattering of Slow Neutrons by Paramagnetic Crystals

et al. 1949

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supporting

confidence: 70%

The Scattering of Slow Neutrons by Paramagnetic Crystals

et al. 1949

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“…This agrees with the measured A if 7=1; Dr 1 = 0.1 kev. Although this assignment seems the most plausible, it should be remembered that Ag has at least two higher resonances 26 Ta 182 : £=8.0, A 3 , 4 = (2.1, -3.5) or (-4.3, +1.5). If the negative scattering length is associated with the first resonance 28 at 4.1 ev, the level spacing (indeterminate /) is Z) r «0.05 kev.…”

Section: Application To Heavier Nucleimentioning

confidence: 94%

Neutron Scattering Lengths

Peaslee

1952

Phys. Rev.

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The schematic treatment of nuclear reactions is applied to the case E n -»0 as a means of interpreting measurements of the scattering length a. It is found that the quantity A = (a-R) rather than a is significant for determining the resonance properties of the compound nucleus, where R is the phenomenological nuclear radius. In some cases this treatment can resolve ambiguity in the evaluation of a without the necessity of polarization measurements and assign the / value of a low-lying resonance or two, but it can only be used successfully for separated isotopes. For practically pure isotopes it can be used to determine rough values of level spacing D from the measured position of the levels nearest E n -Q, or conversely. Values of D obtained in this way are plotted against A to yield an estimate of a parameter in the statistical formula for level density; this estimate suggests a somewhat more rapid increase in level spacing with decreasing excitation than given by the simplest statistical formula.

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“…The experimental resolution of the capture data allowed a good separation of the resonances up to 125 keV neutron energy. For the evaluation of the cross sections in the thermal energy range, earlier measurements were added to the experiment database: total cross section from Cote et al [41] and Rainwater et al [42] and capture cross section from Widder et al [43]. The database used in the evaluation is shown in Table XI.…”

Section: F Potassium 39 K and 41 K Evaluations Including Covariancementioning

confidence: 99%