Inelastic Collision Cross Sections at 1.0-, 4.0-, and 4.5-Mev Neutron Energies

Beyster, J.R.; Henkel, R.L.; Nobles, R. A.; Kister, J. M.

doi:10.1103/physrev.98.1216

Cited by 62 publications

(8 citation statements)

References 14 publications

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“…In particular, the predicted compound nucleus formation is smaller than that required to match the experimental inelastic collision cross sections. 7 Consequently, limit (1) predicted by the model is too high, causing the experimental data to fall systematically below it. Also the energy at which the experiments start to deviate from limit (1) will thus be too high.…”

Section: Resultsmentioning

confidence: 96%

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Compound Elastic Scattering of Neutrons

Emmerich

Sinclair

1956

Phys. Rev.

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Section: Resultsmentioning

confidence: 96%

“…This is in agreement with the conclusion reached independently by comparison with inelastic collision cross sections in the 4-Mev range. 7 The method described here serves, therefore, to estimate the amount of compound elastic scattering. It is also possible in some cases to indicate certain deficiencies in a given nuclear model.…”

Section: Resultsmentioning

confidence: 99%

Compound Elastic Scattering of Neutrons

Emmerich

Sinclair

1956

Phys. Rev.

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“…10 with that calculated from statistical theory. The points are the measured results of various workers 18 ' [38][39][40] and the curve gives the calculated cross section using final states and opticalmodel jparameters as listed in Tables III and IV. The agreement confirms the Al 27 +^ transmission functions used in the theoretical calculations.…”

Section: The Neutron-nonelastic Cross Section Of Al 27mentioning

confidence: 99%

Statistical-Theory Analysis of theMg24(n, p)Na24
Butler¹,
Santry²
1966
Phys. Rev.
3
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0
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Previously reported measurements of the average cross sections for the Mg 24 (w,^)Na 24 and Al 27 (w,a)Na 24 reactions are compared with a detailed statistical-theory calculation in which information on the spin and parity of possible final states is included. The calculations employ nuclear transmission functions evaluated from an optical model of the nucleus. Good agreement is obtained between the calculated and measured average cross sections for neutron energies from the effective thresholds of the reactions to 10 MeV in the center-of-mass system. For a given value of the nuclear potential, the data yield a unique value for the effective radius of the nucleus with its associated particle, (Ro+1.5d) } where d is the surface-thickness parameter. In agreement with the formulation of Lang, a value of 3.6 for the level-density parameter a for Al 27 is obtained from a theoretical fit of A\ 27 (n,a) cross-section results at the higher neutron energies. Fluctuations observed in the Mg 24 (w,^)Na 24 cross section are attributed either to the interference of overlapping levels in the compound nucleus Mg 26 , or to statistical variations in the number of levels of spin type |~ and i~ in the compound nucleus. These are the principal levels that give rise to the product, Na 24 . 1034

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“…Little effort has been made in the past to differentiate between items (3) and (4), and since all of the individual reactions produce two neutrons (the decay of every Be 9 level leads eventually to a neutron and two a particles), the cross sections have generally been collected in the all-inclusive symbol a 2 nAlthough it is obviously a difficult experimental problem to disentangle all of these neutron-producing reactions, it would be of considerable interest to know at least something about the relative cross sections. In addition to the reporting of measurements of the nonelastic cross sections, it is one of the purposes of this paper to draw some conclusions about these latter contributions.…”

Section: Introductionmentioning

confidence: 99%

Elastic and Nonelastic Neutron Cross Sections for Beryllium

1959

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A time-of-flight technique has been used to measure angular distributions for the elastic scattering of neutrons from beryllium in the energy range from 2.6 to 6.0 Mev. Total neutron cross sections were also measured and the following nonelastic (total minus elastic) cross sections obtained: 2.60 Mev (0.27±0.13 barn), 3.50 (0.43=b0.10), 4.10 (0.51=fc0.08), 5.00 (0.60=b0.08), and 6.00 (0.73=b0.07). Differential cross sections were also obtained for the inelastic neutrons leaving Be 9 in the 2.43-Mev excited state. Integration of these angular distributions yielded the following inelastic cross sections: 3.50 Mev (0.23±0.04 barn), 4.10 (0.25±0.04), and 5.00 (0.34dz0.05). A continuous spectrum of neutrons was observed which corresponds to the direct (n,2n) reaction and/or the excitation of the Be 9 "level" at 1.7 Mev. This continuum was found to have an angular distribution roughly symmetric about 90°. The 2.43-Mev state of Be 9 was found to decay by neutron emission to the ground state of Be 8 with a branching ratio of 12±5%.

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Inelastic Collision Cross Sections at 1.0-, 4.0-, and 4.5-Mev Neutron Energies

Cited by 62 publications

References 14 publications

Compound Elastic Scattering of Neutrons

Compound Elastic Scattering of Neutrons

Statistical-Theory Analysis of theMg24(n, p)Na24
Butler¹,
Santry²
1966
Phys. Rev.
3
0
0
0
View full text Add to dashboard Cite

Elastic and Nonelastic Neutron Cross Sections for Beryllium

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Inelastic Collision Cross Sections at 1.0-, 4.0-, and 4.5-Mev Neutron Energies

Cited by 62 publications

References 14 publications

Compound Elastic Scattering of Neutrons

Compound Elastic Scattering of Neutrons

Statistical-Theory Analysis of theMg24(n, p)Na24Butler1, Santry2 1966Phys. Rev.3000View full textAdd to dashboardCite

Elastic and Nonelastic Neutron Cross Sections for Beryllium

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Statistical-Theory Analysis of theMg24(n, p)Na24
Butler¹,
Santry²
1966
Phys. Rev.
3
0
0
0
View full text Add to dashboard Cite