The need for a relativistic approach when calculating proton recoil telescope efficiencies

Thomas, David J.; Axton, E.J.

doi:10.1016/0029-554x(80)90448-6

Cited by 13 publications

(6 citation statements)

References 3 publications

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“…The device, after background identification, measures the neutron energy in the range [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] MeV] with a precision about of 5-10 % for energy up to 14 MeV and 10-15% for lower energies. The validation of the reconstruction is performed thanks to MCNPX calculation; a complete identification of the various sources of pollution is presented which motivates the 4-coincidences criteria for the recoil proton tracking.…”

Section: Resultsmentioning

confidence: 99%

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Energy measurement of fast neutron fields with a Recoil Proton Telescope using active pixel sensors

Taforeau

Schaefer

Higueret

et al. 2014

Progress in Nuclear Science and Technology

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The spectrometer ATHENA (Accurate Telescope for High Energy Neutron metrology Applications), in development at the LNE-IRSN, characterizes energy and fluence of fast neutron fields. The detector is a Recoil Proton Telescope and measures neutron energies in the range of 5 to 20 MeV. The system is intended to become a primary standard for both energy and fluence measurements. The most innovative part of ATHENA is made of three CMOS pixel sensors, thinned down to 50 microns thickness, allowing an accurate tracking of the recoil. The use of CMOS sensors and a thick silicon diode increase the intrinsic efficiency of the detector by a factor of ten compared with conventional designs. In this paper, we demonstrate the ability of the detector to measure neutron energies in the range of 5 to 20 MeV. Experimental investigations, using mono-energetic neutron fields produced by the AMANDE facility, indicate a good reconstruction of neutron energies. The present design is still under development. The accuracy of measuring 5 MeV and 14 MeV neutron energies was 15% and 5%, respectively.

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Section: Resultsmentioning

confidence: 99%

“…A complete description of the kinematic reaction can be found in [5]. A non-relativistic approach leads to a direct relation between the energy of the incident neutron E n and the energy of the recoil E r .…”

Section: Design Of the Detectormentioning

confidence: 99%

Energy measurement of fast neutron fields with a Recoil Proton Telescope using active pixel sensors

Taforeau

Schaefer

Higueret

et al. 2014

Progress in Nuclear Science and Technology

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“…corrects the effect of the non-relativistic kinematic formulas used in MCNPX for the transformation of the differential scattering cross section in the centre-of-mass system to the recoil proton emission cross section in the laboratory system [24].…”

Section: Analysis Of T1 Measurementsmentioning

confidence: 99%

Comparison of methods to determine the fluence of monoenergetic neutrons in the energy range from 30 keV to 14.8 MeV

Nolte,

Lutz

2024

Metrologia

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The primary reference instruments for neutron fluence measurements used at the Physikalisch-Technische Bundesanstalt (PTB) are based on the primary standard for neutron measurements which is the differential neutron-proton scattering cross section. Such instruments require considerable effort for their operation and analysis. Therefore, routine measurements are carried out using a transfer instrument to facilitate the efficient provision of services to customers. A series of measurements was conducted to compare the transfer device to the primary reference instruments and ensure the traceability of neutron fluence measurements. This resulted in an improved characterization of the instrument and new analysis procedures. For neutron energies between 144 keV and 14.8 MeV, the ratio of neutron fluence values measured with the primary reference instruments and the transfer instrument deviates from unity by less than the estimated standard measurement uncertainties of 2.6 % - 3.2 %. At neutron energies between 30 keV and 100 keV, however, the experimental fluence ratios deviate from unity by about 4 % which exceeds the estimated uncertainties of of 2.5 % - 2.9 %. At present, the reason for this inconsistency remains unresolved.

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“…The detection of incident neutron is possible thanks to elastic scattering in a converter, producing a nucleus recoil. In first approximation, the use of a non-relativistic kinematics is possible, a complete and more accurate description of kinematics is proposed by [28]. Under this approximation, the kinematic of the reactions is quite simple and provides a basic relation between the energy of the incident neutron E n and the energy of the recoil E r :…”

Section: The Rpt Principlementioning

confidence: 99%

A new recoil proton telescope for characterisation of energy and fluence of fast neutron fields

Taforeau¹,

Higueret²,

Husson³

et al. 2012

J. Inst.

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A new neutron spectrometer, called ATHENA (Accurate Telescope for High Energy Neutron metrology Applications), is under development at the LNE-IRSN. This detector, based on the Recoil Proton Telescope (RPT) principle, is dedicated to the characterization of mono energetic neutron fields produced at the AMANDE facility. In order to be considered as a primary measurement standard, ATHENA will measure, at the level of metrological quality, energy and fluence of the neutrons fields in the range [5 MeV;20 MeV]. Thanks to an innovative tracking of the proton recoils, using CMOS pixel sensors, and to a large acceptance, the RPT will be able to reconstruct both trajectories and energies of the recoil protons with high accuracy. The first prototype of the RPT has allowed validation of the detector principle.The expected performances, in terms of energy resolution and fluence are under investigation. Monte Carlo simulations, based on a MCNPX calculation, have been made. These simulations have allowed to compare theoretical predictions to experimental data obtained at the AMANDE facility.An excellent reconstruction of the 14 MeV neutron is already demonstrated. The results suggest that the RPT will measure energy and fluence of the AMANDE neutron's fields with a good precision and is aimed to become a measurement standard.

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The need for a relativistic approach when calculating proton recoil telescope efficiencies

Cited by 13 publications

References 3 publications

Energy measurement of fast neutron fields with a Recoil Proton Telescope using active pixel sensors

Energy measurement of fast neutron fields with a Recoil Proton Telescope using active pixel sensors

Comparison of methods to determine the fluence of monoenergetic neutrons in the energy range from 30 keV to 14.8 MeV

A new recoil proton telescope for characterisation of energy and fluence of fast neutron fields

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