The (α, n) cross sections on 17O and 18O between 5 and 12.5 MeV

Hansen, L. F.; Anderson, J. D.; McClure, J.W.; Pohl, B.A.; Stelts, M.L.; Wesolowski, J.J.; Wong, C.

doi:10.1016/0375-9474(67)90895-0

Cited by 35 publications

(46 citation statements)

References 13 publications

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“…8 The conclusion drawn from this study was that the (a,n) cross section for 17 O was approximately 10% of that for I8 O. More recent experiments by workers at Lawrence Livermore Laboratory (LLL) 9 give data on the cross sections of the (a,n) reaction on "O and l8 O for alpha particle energies from 5 to 12.5 MeV. The ratio of 17 The fabrication of 35 proceeded smoothly.…”

Section: )mentioning

confidence: 67%

Preparation and evaluation of medical-grade plutonium-238 fuels, July 1, 1971--June 30, 1973

Mullins¹

1974

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Section: )mentioning

confidence: 67%

Preparation and evaluation of medical-grade plutonium-238 fuels, July 1, 1971--June 30, 1973

Mullins¹

1974

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“…We considered the seven most important (α, n) target nuclides, together with spontaneous fission accounting for > 96 % of neutron production. Experimental data from Flynn et al (1978) (EXFOR entires A0509005, A0509007, A0509008) were used for 27 Al,29 Si and 30 Si;Norman et al (1982) (C0731001) data for 23 Na; combined Bair and Willard (1962) (P0120002) and Hansen et al (1967) (P0116003) data for 18 O. In the case of 25 Mg and 26 Mg where no experimental data are available in the EXFOR database, we arbitrarily set the uncertainty at 10 %.…”

Section: Uncertainty In the Calculationmentioning

confidence: 99%

Subterranean production of neutrons, 39Ar and 21Ne: Rates and uncertainties

Šrámek

Stevens

McDonough

et al. 2017

Geochimica et Cosmochimica Acta

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Accurate understanding of the subsurface production rate of the radionuclide 39 Ar is necessary for argon dating techniques and noble gas geochemistry of the shallow and the deep Earth, and is also of interest to the WIMP dark matter experimental particle physics community. Our new calculations of subsurface production of neutrons, 21 Ne, and 39 Ar take advantage of the state-of-the-art reliable tools of nuclear physics to obtain reaction cross sections and spectra (TALYS) and to evaluate neutron propagation in rock (MCNP6). We discuss our method and results in relation to previous studies and show the relative importance of various neutron, 21 Ne, and 39 Ar nucleogenic production channels. Uncertainty in nuclear reaction cross sections, which is the major contributor to overall calculation uncertainty, is estimated from variability in existing experimental and library data. Depending on selected rock composition, on the order of 10 7 -10 10 α particles are produced in one kilogram of rock per year (order of 1-10 3 kg −1 s −1 ); the number of produced neutrons is lower by ∼ 6 orders of magnitude, 21 Ne production rate drops by an additional factor of 15-20, and another one order of magnitude or more is dropped in production of 39 Ar. Our calculation yields a nucleogenic 21 Ne/ 4 He production ratio of (4.6 ± 0.6) × 10 −8 in Continental Crust and (4.2 ± 0.5) × 10 −8 in Oceanic Crust and Depleted Mantle. Calculated 39 Ar production rates span a great range from 29 ± 9 atoms kg-rock −1 yr −1 in the K-Th-U-enriched Upper Continental Crust to (2.6±0.8)×10 −4 atoms kg-rock −1 yr −1 in Depleted Upper Mantle. Nucleogenic 39 Ar production exceeds the cosmogenic production below ∼ 700 meters depth and thus, affects radiometric ages of groundwater. The 39 Ar chronometer, which fills in a gap between 3 H and 14 C, is particularly important given the need to tap deep reservoirs of ancient drinking water.

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“…Cross sections for neon producing reactions have been measured over the last several decades (Bair and Willard, 1962;Hansen et al, 1967;Bair and Del Campo, 1979;Norman et al, 1984), usually using a thin-target approach in which the cross section is determined by measuring the production rate of neutrons using alpha particles at just a single energy. In contrast, nucleogenic neon production in a mineral involves reactions occurring along the entire trajectory as the alpha particle slows and eventually comes to rest, and thus involves an integral along the alpha particle energy path.…”

Section: The Production Of Neon By Uranium and Thorium Decaymentioning

confidence: 99%

“…Ne cross section data (Bair and Willard, 1962;Hansen et al, 1967;Bair and Del Campo, 1979). Note that our calculations in Section 1.1 use the same approach for establishing the 18 O( ,n) ,n) 21 Ne cross section as Gautheron et al (2006), so are not an independent estimate for comparison.…”

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confidence: 99%

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Direct measurement of neon production rates by (α,n) reactions in minerals

Cox

Farley

Cherniak

2015

Geochimica et Cosmochimica Acta

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Please cite this article as: Cox, S.E., Farley, K.A., Cherniak, D.J., Direct measurement of neon production rates by (α,n) reactions in minerals, Geochimica et Cosmochimica Acta (2014), doi: http://dx.doi.org/10.1016/j.gca. 2014.08.036 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.1 Direct measurement of neon production rates by ( ,n) reactions in minerals ,n) reactions in minerals He production rate ratios for a variety of minerals of geochemical interest along with software for calculating neon production rates and (U-Th)/Ne ages.

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The (α, n) cross sections on 17O and 18O between 5 and 12.5 MeV

Cited by 35 publications

References 13 publications

Preparation and evaluation of medical-grade plutonium-238 fuels, July 1, 1971--June 30, 1973

Preparation and evaluation of medical-grade plutonium-238 fuels, July 1, 1971--June 30, 1973

Subterranean production of neutrons, 39Ar and 21Ne: Rates and uncertainties

Direct measurement of neon production rates by (α,n) reactions in minerals

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