Neutron cross sections for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mi mathvariant="normal">He</mml:mi><mml:mprescripts /><mml:none /><mml:mn>3</mml:mn></mml:mmultiscripts></mml:mrow></mml:math>at epithermal energies

Keith, C. D.; Chowdhuri, Z.; Rich, D. R.; Snow, W. M.; Bowman, J. D.; Penttilä, S.; Smith, D. A.; Leuschner, M.; Pomeroy, V. R.; Jones, G. L.; Sharapov, E.I.

doi:10.1103/physrevc.69.034005

Cited by 21 publications

(8 citation statements)

References 15 publications

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Section: Discussionmentioning

confidence: 95%

“…where a and b are free parameters [35]. According to the previous measurements from thermal energy to a few eV [35,36,37], the dispersions of 3 He(n,p) 3 H and the 14 N(n,p) 14 C reactions from the 1/v law, b √ E/a are estimated as less than 0.02% and 0.05% below 25.3 meV, respectively. The event rate ratios of S( 14 N)/S( 3 He) of neutron bunches corresponding to the average neutron energy for gas I and gas II are shown in Fig.…”

Section: Discussionmentioning

confidence: 95%

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Improved determination of thermal cross section of 14N(n,p)14C for the neutron lifetime measurement

Kitahara¹,

Hirota²,

Ieki³

et al. 2019

Preprint

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 95%

Improved determination of thermal cross section of 14N(n,p)14C for the neutron lifetime measurement

Kitahara¹,

Hirota²,

Ieki³

et al. 2019

Preprint

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“…However this measurement was conducted at a CW reactor neutron source without the benefit of the use of a broad set of neutron energies for additional systematic uncertainty suppression. Our measurement also shares some common approaches with an earlier high-precision measurement of the n− 3 He total cross section in the epithermal energy range from 1 eV to 1 keV [37] that was also performed at a pulsed neutron source, but by contrast our measurement was performed using meV neutron energies at nonzero scattering angles rather than eV-keV neutron energies in transmission.…”

Section: Introductionmentioning

confidence: 81%

Measurement of the total neutron-scattering cross-section ratios of noble gases of natural isotopic composition using a pulsed neutron beam

et al. 2019

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Precision measurements of slow neutron cross sections with atoms have several scientific applications. In particular the n-4 He s-wave scattering length is important to know both for helping to constrain the nuclear three-body interaction and for the proper interpretation of several ongoing slow neutron experiments searching for other types of neutron-atom interactions. We present new measurements of the ratios of the neutron differential scattering cross sections for natural isotopicabundance mixtures of the noble gases He, Ar, Kr, and Xe to natural isotopic abundance Ne.These measurements were performed using a recently developed neutron scattering apparatus for gas samples located on a pulsed slow neutron beamline which was designed to search for possible exotic neutron-atom interactions and employs both neutron time of flight information and a position -sensitive neutron detector for scattering event reconstruction. We found agreement with the literature values of scattering cross sections inferred from Ar/Ne, Kr/Ne and Xe/Ne differential cross section ratios over the q range of 1 − 7 nm −1 . However for the case of He/Ne we find that the cross section inferred differs by 11.3% (7.6 σ) from previously-reported values inferred from neutron phase shift measurements, but is in reasonable agreement with values from other measurements.The very large discrepancy in the He/Ne ratio calls for a new precision measurement of the n-4 He scattering length using neutron interferometry.

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“…Also, cross section of this reaction at a range of incident neutron energy 0.15 -150 keV was measured [19]. Cross sections for (n, p) reactions of He-3 by thermal neutrons have been determined in [20], while cross sections for (n, p) reactions of He-3 by epithermal neutrons have been measured in [21]. Different monoenergetic neutrons between and He3-filled proportional counter were used to obtain the cross sections of both (n, p) and (n, d) reactions of the target He-3 [22].…”

Section: Experimental Data Of (N P) and (N D) Reactions Of He-3mentioning

confidence: 99%

Empirical Neutron Cross Section Formulae for (n, p) and (n, d) Reactions of He-3 Target

Alramady¹

2021

JAMP

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In this work, new cross section formulae for (n, p) and (n, d) reactions of He-3 have been investigated as a function of incident neutron energy. The new Empirical formulae were produced by using the least squares method to the experimental cross sections data, which were taken from Experimental Nuclear Reaction Data EXFOR Database Version of 2021. Several functions were examined to choose the best one that fits the data. Statistical hypothesis testing was used to insure how well the suggested equations fit the set of data. Two statistical indicators were used for each case for goodness-of-fit. Very high compatibility was found between the empirical values and the experimental data for both reactions.

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Neutron cross sections forHe3at epithermal energies

Cited by 21 publications

References 15 publications

Improved determination of thermal cross section of 14N(n,p)14C for the neutron lifetime measurement

Improved determination of thermal cross section of 14N(n,p)14C for the neutron lifetime measurement

Measurement of the total neutron-scattering cross-section ratios of noble gases of natural isotopic composition using a pulsed neutron beam

Empirical Neutron Cross Section Formulae for (n, p) and (n, d) Reactions of He-3 Target

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