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- W2034874940 abstract "Excitation functions resulting from the 56Fe(α, xnyp), 56Fe(3He, xnyp) and 54Fe(α, xnyp) reactions have been compared with three sets of statistical theory calculations. The first set of calculations employed a level density expression of the form ϱ(E,J) ∞ (2J+1)E−2exp2√aE, where the excitation energy was corrected for pairing effects. The excitation functions calculated with this level density expression grossly overestimate the yields of 56Ni and 57Ni, and all calculated excitation functions attain their maximum yields at lower energies than the corresponding experimental excitation functions. Results of a second set of calculations in which the shell effect suggested by Margenau is considered explicitly by using the level density model of Rosenzweig show that the discrepancies are quantitatively consistent with the expectations of a dependence of level densities on shell occupation. It is shown that the disagreement in energy at which calculated and experimental excitation functions attain their maximum yields shows a correlation with average angular momentum, but not with excitation energy or the number of particles emitted. A third set of calculations was performed with a level density of the form ϱ(E,J) ∞ (2J+1)(E−Erot)−2 exp2√a(E−Erot) where for each value of J, Erot = J(J+1)h̵2/2Irig and where Irig is the rigid body moment of inertia. Evaporation probabilities were summed for each impact parameter J, weighted as 2J+1)TJ where JJ is the optical model transmission coefficient for formation of the compound nucleus. It was assumed that all rotational energy was dissipated by γ-ray de-excitation with no change in the spin distribution throughout the evaporation cascade. The results of the third set of calculations gave improved agreement with respect to energy dependence of excitation functions. In all three sets of calculations the pairing energy correction was taken from the masses of Everling et al., optical model nonelastic cross sections were used for inverse reaction cross sections, and the level spacing parameter was evaluated from the 59Co(p, α) spectral measurement of Sherr and Brady." @default.
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- W2034874940 date "1965-10-01" @default.
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- W2034874940 title "Evidence for shell structure and angular momentum effects in the decay of compound nuclei of nickel" @default.
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- W2034874940 doi "https://doi.org/10.1016/0029-5582(65)90412-8" @default.
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