Scattering of Neutrons by Carbon from 3 to 7 MeV

Galati, W.; Brandenberger, J.D.; Weil, J.L.

doi:10.1103/physrevc.5.1508

Cited by 23 publications

(8 citation statements)

References 36 publications

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“…The squares indicate the energies, and the width of the horizontal bars represents the energy spread associated with the present n-12 C A y (θ ) data. As can be seen, the energy region between 2.2 [19] it is known that at these three energy regions A y (θ ) varies rapidly with neutron-energy. Considering our finite neutron-energy spread, it would have been impossible to extract useful A y (θ ) information at these energies.…”

Section: Resultsmentioning

confidence: 93%

Measurements ofAy(θ)forC12
Roper
¹
,
Tornow
²
,
Braun
³

et al. 2005
Phys. Rev. C
8
1
9
0
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The analyzing power A y (θ ) for neutron elastic scattering from 12 C has been measured for 33 neutron energies between E n = 2.2 and 8.5 MeV in the angular range from 25 • to 145 • in the laboratory system. The primary motivation for these measurements is the need for an accurate knowledge of A y (θ) for 12 C(n, n) 12 C elastic scattering to enable corrections to high-precision neutron-proton and neutron-deuteron A y (θ) data in the neutronenergy range below E n = 30 MeV. In their own right, 12 C(n, n) 12 C A y (θ) data are of crucial importance for improving both the parametrization of n-12 C scattering and our knowledge of the level scheme of 13 C. The present A y (θ ) data are compared with published data and previous phase-shift-analysis results.

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Section: Resultsmentioning

confidence: 93%

Measurements ofAy(θ)forC12
Roper
¹
,
Tornow
²
,
Braun
³

et al. 2005
Phys. Rev. C
8
1
9
0
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“…From the beginning the facility has served as a factory for pulsed monoenergetic fast neutrons. The terminal ion pulsing system can deliver several microamperes of protons, deuterons, 3 He, or 4 He ions on target with ∼1 ns bunch widths. The facility achieves an almost unmatched combination of intense, a e-mail: vanhoy@usna.edu b e-mail: hicks@udallas.edu c e-mail: marcus@uky.edu d e-mail: yates@uky.edu Figure 1.…”

Section: The Accelerator Facilitymentioning

confidence: 99%

“…We were able to examine a few spectra used for Ref [3] and find that the effects discussed above would not have been detected. This is likely a widespread issue among datasets for low-A targets of that era.…”

Section: Tof Spectra On Light Nucleimentioning

confidence: 99%

The Neutron Time-of-Flight Cross Section Program at the University of Kentucky - Adventures in Analysis II

Vanhoy

Hicks

Combs

et al. 2015

EPJ Web of Conferences

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Abstract. Elastic and inelastic neutron differential cross sections are measured at the University of Kentucky Accelerator Laboratory (www.pa.uky.edu/accelerator/) at incident energies in the fast neutron region. The laboratorys facilities and instrumentation will be described and our measurement and analysis procedures outlined. Many corrections are required for neutron scattering experiments and the analysis utilizes information from many other cross section data sets and model calculations. Exploring and understanding the limitations of the foundational information and procedures are important for controlling the accuracy of the cross section results. We are examining the limitations in neutron detection efficiency, the normalization of (n,n γ) cross sections, background reduction, spectrum stripping techniques, and attenuation and multiple scattering corrections. The resulting differential cross sections provide information on the compound elastic and coupled channels reaction mechanisms important for advanced reactor designs.

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“…As known from the work of Ref. [7], the A y (θ ) of 12 C( n,n) shows large fluctuations with energy in the range between 3.0 and 7.0 MeV. Because of the kinematic variation of the neutron energies over the face of the side detectors, the 12 C-p double-scattering events can introduce a false asymmetry into the n-p A y (θ ) measurement [8].…”

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confidence: 95%

Corrections for the polarization-dependent efficiency and new neutron-proton analyzing power data at 7.6 MeV

2010

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We present new corrections for the polarization-dependent efficiency (PDE), which introduces a false asymmetry into measurements of n-p analyzing power A y (θ) caused by double scattering in the neutron side detectors. To accomplish this, we created a new database of 12 C( n,n) A y (θ) by using a combination of fits to data, phase-shift analysis, and R-matrix analysis. Our recorrection for PDE of previously reported n-p A y (θ) data at 7.6 and 12.0 MeV and new data at 7.6 MeV indicate that we have achieved a superior representation of 12 C( n,n). Our results continue to suggest a possible charge dependence of the pion-nucleon coupling constant.The motivation for collecting high-precision neutronproton (n-p) analyzing power A y (θ ) data is to test the accuracy of nucleon-nucleon (NN) phase-shift analysis (PSA) predictions for this observable. At low energy, n-p A y (θ ) depends greatly on the 3 P 0 , 3 P 1 , and 3 P 2 phase shifts and good-quality data can be useful in constraining these parameters. Nearly two decades ago, Triangle Universities Nuclear Laboratory (TUNL) collected n-p A y (θ ) data at E n = 7.6, 12.0, 14.0, 16.0, and 18.0 MeV [1]. In terms of uncertainties, these data were of similar quality as earlier measurements by Holslin and co-workers [2] at E n = 10.03 MeV. None of these data were of adequate precision to show clear discrepancies with the Nijmegen PSA predictions [3]. Reference [1] also found that data from 14 to 20 MeV probably would not be able to demonstrate discrepancies with NN predictions, since there is less difference between the various theoretical models in this energy range.

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Scattering of Neutrons by Carbon from 3 to 7 MeV

Cited by 23 publications

References 36 publications

Measurements ofAy(θ)forC12
Roper
¹
,
Tornow
²
,
Braun
³

et al. 2005
Phys. Rev. C
8
1
9
0
View full text Add to dashboard Cite

Measurements ofAy(θ)forC12
Roper
¹
,
Tornow
²
,
Braun
³

et al. 2005
Phys. Rev. C
8
1
9
0
View full text Add to dashboard Cite

The Neutron Time-of-Flight Cross Section Program at the University of Kentucky - Adventures in Analysis II

Corrections for the polarization-dependent efficiency and new neutron-proton analyzing power data at 7.6 MeV

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Scattering of Neutrons by Carbon from 3 to 7 MeV

Cited by 23 publications

References 36 publications

Measurements ofAy(θ)forC12Roper1, Tornow2, Braun3 et al. 2005Phys. Rev. C8190View full textAdd to dashboardCite

Measurements ofAy(θ)forC12Roper1, Tornow2, Braun3 et al. 2005Phys. Rev. C8190View full textAdd to dashboardCite

The Neutron Time-of-Flight Cross Section Program at the University of Kentucky - Adventures in Analysis II

Corrections for the polarization-dependent efficiency and new neutron-proton analyzing power data at 7.6 MeV

Contact Info

Product

Resources

About

Measurements ofAy(θ)forC12
Roper
¹
,
Tornow
²
,
Braun
³

et al. 2005
Phys. Rev. C
8
1
9
0
View full text Add to dashboard Cite

Measurements ofAy(θ)forC12
Roper
¹
,
Tornow
²
,
Braun
³

et al. 2005
Phys. Rev. C
8
1
9
0
View full text Add to dashboard Cite