Thermal and 14.4 MeV neutron activation cross sections of argon

Ranakumar, N.; Karttunen, E.; Fink, R.W.

doi:10.1016/0375-9474(69)90996-8

Cited by 15 publications

(8 citation statements)

References 11 publications

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“…Note that the experimental measurements are partial cross-sections to excited states of 39 Ar [27]. (b) 40 Ar(n, d) 39 Cl cross-sections with experimental measurements at ≈ 14.6 MeV [28][29][30]. The Silberberg & Tsao (n, d) cross-section calculated by ACTIVIA is combined with the (n, 2n) cross-section shown in panel (a).…”

Section: Ar Production Mechanismsmentioning

confidence: 99%

Cosmogenic production of Ar39 and Ar37 in argon

et al. 2019

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We have experimentally determined the production rate of 39 Ar and 37 Ar due to cosmic ray neutron interactions in argon at sea level. Understanding these production rates is important for argon-based dark matter experiments that plan to utilize argon extracted from deep underground because it is imperative to know what the ingrowth of 39 Ar will be during the production, transport, and storage of the underground argon. These measurements also allow for the prediction of 39 Ar and 37 Ar concentrations in the atmosphere which can be used to determine the presence of other sources of these isotopes. Through controlled irradiation with a neutron beam that mimics the cosmic ray neutron spectrum, followed by direct counting of 39 Ar and 37 Ar decays with sensitive ultra-low background proportional counters, we determined that the production rate from cosmic ray neutrons at sea-level is expected to be (759 ± 128) atoms/(kg Ar day) for 39 Ar, and (51.0 ± 7.4) atoms/(kg Ar day) for 37 Ar. We also performed a survey of the alternate production mechanisms based on the state-of-knowledge of the associated cross-sections to obtain a total sea-level cosmic ray production rate of (1048 ± 133) atoms/(kg Ar day) for 39 Ar, (56.7 ± 7.5) atoms/(kg Ar day) for 37 Ar in underground argon, and (92 ± 13) atoms/(kg Ar day) for 37 Ar in atmospheric argon.

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Section: Ar Production Mechanismsmentioning

confidence: 99%

Cosmogenic production of Ar39 and Ar37 in argon

et al. 2019

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“…Unfortunately, experimental cross-section information on the reaction 40 Ar(n,p) 40 Cl is very limited. The only three existing data points [9][10][11] are at around 14.7 MeV. While two of them [10,11] agree very well, the third datum [9] is larger by almost a factor of 2.…”

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confidence: 87%

“…Using the neutron yield and the known argon mass, finite-geometry cross-section values were obtained. Finally, these values were deconvoluted to account for the energy dependence, and It should be pointed out again that the cross-section values measured here as well as those of [9][10][11] were obtained by determining the γ -ray transition yield from the decay of the first excited state of 40 Ar at 1461 keV to its ground state. Therefore, the measured cross-section data represent only the partial 40 Ar(n,p) 40 Cl cross section, because not all levels in 40 Ar excited by the beta decay of 40 Cl decay through the level at 1461 keV.…”

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confidence: 99%

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40Ar(n,p)40Cl reaction cross section

et al. 2012

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The activation technique was used to measure the cross section for the reaction 40 Ar(n,p) 40 Cl in 0.5 MeV energy steps in the neutron energy range between 9 and 15 MeV. These data are important for estimating background contributions in neutrinoless double-beta decay and dark matter searches, as well as in argon-based large neutrino detectors. The data are compared to evaluations and theoretical predictions.

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“…All these applications rely on having a complete understanding of the transport of neutrons through liquid argon and the physics of the (n,γ) capture process on natural argon. There has been only three measurements of the thermal-neutron capture cross section, and these have yielded inconsistent results [8][9][10]. All were done by activating samples of argon in a nuclear reactor, counting the beta decay of the 41 Ar daughter in a gamma spectrometer, and then making appropriate corrections to convert the reactor spectral averaged cross section to the standard thermal cross section (σ 2200 ).…”

Section: Introductionmentioning

confidence: 99%

Measurement of the neutron capture cross section on argon

et al. 2019

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The use of argon as a detection and shielding medium for neutrino and dark matter experiments has made the precise knowledge of the cross section for neutron capture on argon an important design and operational parameter. Since previous measurements were averaged over thermal spectra and have significant disagreements, a differential measurement has been performed using a Time-Of-Flight neutron beam and a ∼4π gamma spectrometer. A fit to the differential cross section from 0.015 − 0.15 eV, assuming a 1/v energy dependence, yields σ 2200 = 673 ± 26 (stat.) ± 59 (sys.) mb.

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Thermal and 14.4 MeV neutron activation cross sections of argon

Cited by 15 publications

References 11 publications

Cosmogenic production of Ar39 and Ar37 in argon

Cosmogenic production of Ar39 and Ar37 in argon

40Ar(n,p)40Cl reaction cross section

Measurement of the neutron capture cross section on argon

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