Total Cross Sections for 14-Mev Neutrons

Coon, J. H.; Graves, E. R.; Barschall, H. H.

doi:10.1103/physrev.88.562

Cited by 119 publications

(6 citation statements)

References 6 publications

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“…This must be compensated for by certain configuration interaction effects that would be absent, to second order in perturbation theory, if the unrestricted Hartree-Fock method were used. 3 The principal result of the present work is to indicate that these specific configuration interaction effects can account for the hyperfine splitting of lithium to within one percent of the experimental value. Essentially the same result should be obtained by an unrestricted Hartree-Fock calculation, if carried out with sufficient accuracy.…”

Section: Introductionmentioning

confidence: 74%

“…A general discussion of this polarization effect, with special reference to the lithium atom, has been given in an earlier paper. 3 The case of the lithium atom has also been discussed by Pratt. 4 The present paper reports results of a series of calculations undertaken to see if this exchange polarization effect could account quantitatively for the hyperfine structure of lithium.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Hyperfine Structure of the Ground State of Lithium

Nesbet

1960

Phys. Rev.

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The magnetic hyperfine splitting of the 2 S ground state of the lithium atom is calculated. It is shown that the discrepancy between experiment and the value calculated in the traditional Hartree-Fock approximation can be accounted for quantitatively by the exchange polarization effect, which distorts one Is orbital relative to the other. The present calculation obtains a value within one percent of the experimental value. A general procedure is proposed for evaluating operators that do not commute with the Hamiltonian, when approximate variational methods must be used.

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Section: Introductionmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Magnetic Hyperfine Structure of the Ground State of Lithium

Nesbet

1960

Phys. Rev.

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“…For neon and xenon only data from quasimonoener- Figure 6. The effective total cross sections for nat He, nat O, nat Ne, nat Xe, nat Pt, and 238 U are shown in comparison with selected experimental results from literature [4,[6][7][8][16][17][18][19][20][21][22][23][24][25][26][27][28] taken from the EXFOR data base [29] and data from the JEFF evaluation [30]. The data from this work are shown with energy bin sizes corresponding to a time-of-flight bin size of 0.5 ns.…”

Section: Resultsmentioning

confidence: 99%

Neutron transmission measurements at nELBE

et al. 2020

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Neutron total cross sections are an important source of experimental data in the evaluation of neutron-induced cross sections. The sum of all neutron-induced reaction cross sections can be determined with a precision of a few per cent in a relative measurement. The neutron spectrum of the photoneutron source nELBE extends in the fast region from about 100 keV to 10 MeV and has favourable conditions for transmission measurements due to the low instantaneous flux of neutrons and low gamma-flash background. Several materials of interest (in part included in the CIELO evaluation or on the HPRL of OECD/NEA) have been investigated: 197Au [1, 2], natFe [2], natW [2], 238U, natPt, 4He, natO, natNe, natXe. For gaseous targets high pressure gas cells with flat end-caps have been built that hold up to 200 bar pressure. The experimental setup will be presented including results from several transmission experiments and the data analysis leading to the total cross sections will be discussed.

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“…The inelastic scattering data was taken from this work, that of Kinney and Perey [12] and the lower-energy inelastic studies of [20][21][22]. Additional attention was given to energy averages of the neutron total cross sections, up to energies of ≈ 20 MeV, using the results of [13,20,22,[24][25][26][27][28][29][30][31][32][33]. Measured strength functions were compared with model predictions using the compilation of [34] and some consideration was given to the polarization of elastically-scattered neutrons [35,36].…”

Section: Model Interpretationsmentioning

confidence: 99%

Local Homology and Cohomology, Homology Dimension and Generalized Manifolds

Harlap¹

1975

Math. USSR Sb.

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Differential neutron elastic-scattering cross sections of elemental titanium were measured from 4.5 to 10.0 MeV in incident-energy increments of ≈ 0.5 MeV and at forty or more scattering angles distributed between ≈ 17 • and 160 • degrees. Concurrently, differential neutron inelastic-scattering cross sections were measured for observed excitations of 975 ± 34, 1497 ± 33, 2322 ± 58, 3252 ± 43, 3700 ± 93, 4317 ± 75 and 4795± ≈ 100 keV. All of the observed inelastic neutron groups were composites of contributions from several isotopes and/or levels. The experimental results were used to develop energy-average optical, statistical and coupled-channels models.

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Total Cross Sections for 14-Mev Neutrons

Cited by 119 publications

References 6 publications

Magnetic Hyperfine Structure of the Ground State of Lithium

Magnetic Hyperfine Structure of the Ground State of Lithium

Neutron transmission measurements at nELBE

Local Homology and Cohomology, Homology Dimension and Generalized Manifolds

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