A precise determination of the thermal neutron absorption cross section of b10 and natural boron by time of flight

A. Prosdocimi; A. J. Deruytter

doi:10.1016/0368-3230(63)90027-2

A precise determination of the thermal neutron absorption cross section of b10 and natural boron by time of flight

A. Prosdocimi, A. J. Deruytter

Research output › peer-review

Abstract

The total cross section of B203 has been measured from 0006 eV to 0082 eV with the BR-1 slowchopper. Samples of natural boron with an isotopic abundance of (19·81 ± 0·02) per cent B¹⁰ atoms, and boron enriched up to (96·515 ± 0·013) per cent were used for these measurements. From the accurate total cross-section values obtained, the ratio of the boron absorption cross section to the reciprocal of neutron velocity was calculated. This quantity remains a constant over the entire energy range covered and its mean value for natural boron is K = (1674 ± 0·0041) barns m/μs and for the enriched boron K = (8·15 ± 0·019) barns m/μs. The deduced values for the boron absorption cross section at the reference neutron velocity of 2200 m/s are for natural boron σ_a = 7608 ± 1·9 barns and for the enriched boron σ_a = 3703 ± 8·9 barns. These values yield for the absorption cross section of the B¹⁰ isotope at the reference velocity 3840 ± 11 barns as deduced from the natural boron results, and 3837 ± 9 barns from the enriched sample.

Original language	English
Pages (from-to)	83-87
Number of pages	5
Journal	Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology
Volume	17
Issue number	2
DOIs	https://doi.org/10.1016/0368-3230(63)90027-2
State	Published - Feb 1963
Externally published	Yes

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10.1016/0368-3230(63)90027-2

Cite this

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title = "A precise determination of the thermal neutron absorption cross section of b10 and natural boron by time of flight",

abstract = "The total cross section of B203 has been measured from 0006 eV to 0082 eV with the BR-1 slowchopper. Samples of natural boron with an isotopic abundance of (19·81 ± 0·02) per cent B10 atoms, and boron enriched up to (96·515 ± 0·013) per cent were used for these measurements. From the accurate total cross-section values obtained, the ratio of the boron absorption cross section to the reciprocal of neutron velocity was calculated. This quantity remains a constant over the entire energy range covered and its mean value for natural boron is K = (1674 ± 0·0041) barns m/μs and for the enriched boron K = (8·15 ± 0·019) barns m/μs. The deduced values for the boron absorption cross section at the reference neutron velocity of 2200 m/s are for natural boron σa = 7608 ± 1·9 barns and for the enriched boron σa = 3703 ± 8·9 barns. These values yield for the absorption cross section of the B10 isotope at the reference velocity 3840 ± 11 barns as deduced from the natural boron results, and 3837 ± 9 barns from the enriched sample.",

author = "A. Prosdocimi and Deruytter, {A. J.}",

year = "1963",

month = feb,

doi = "10.1016/0368-3230(63)90027-2",

language = "English",

volume = "17",

pages = "83--87",

journal = "Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology",

issn = "0368-3230",

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number = "2",

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T1 - A precise determination of the thermal neutron absorption cross section of b10 and natural boron by time of flight

AU - Prosdocimi, A.

AU - Deruytter, A. J.

PY - 1963/2

Y1 - 1963/2

N2 - The total cross section of B203 has been measured from 0006 eV to 0082 eV with the BR-1 slowchopper. Samples of natural boron with an isotopic abundance of (19·81 ± 0·02) per cent B10 atoms, and boron enriched up to (96·515 ± 0·013) per cent were used for these measurements. From the accurate total cross-section values obtained, the ratio of the boron absorption cross section to the reciprocal of neutron velocity was calculated. This quantity remains a constant over the entire energy range covered and its mean value for natural boron is K = (1674 ± 0·0041) barns m/μs and for the enriched boron K = (8·15 ± 0·019) barns m/μs. The deduced values for the boron absorption cross section at the reference neutron velocity of 2200 m/s are for natural boron σa = 7608 ± 1·9 barns and for the enriched boron σa = 3703 ± 8·9 barns. These values yield for the absorption cross section of the B10 isotope at the reference velocity 3840 ± 11 barns as deduced from the natural boron results, and 3837 ± 9 barns from the enriched sample.

AB - The total cross section of B203 has been measured from 0006 eV to 0082 eV with the BR-1 slowchopper. Samples of natural boron with an isotopic abundance of (19·81 ± 0·02) per cent B10 atoms, and boron enriched up to (96·515 ± 0·013) per cent were used for these measurements. From the accurate total cross-section values obtained, the ratio of the boron absorption cross section to the reciprocal of neutron velocity was calculated. This quantity remains a constant over the entire energy range covered and its mean value for natural boron is K = (1674 ± 0·0041) barns m/μs and for the enriched boron K = (8·15 ± 0·019) barns m/μs. The deduced values for the boron absorption cross section at the reference neutron velocity of 2200 m/s are for natural boron σa = 7608 ± 1·9 barns and for the enriched boron σa = 3703 ± 8·9 barns. These values yield for the absorption cross section of the B10 isotope at the reference velocity 3840 ± 11 barns as deduced from the natural boron results, and 3837 ± 9 barns from the enriched sample.

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