Improved method for the determination of neutron energies from their times-of-flight

A. Chietera P. Désesquelles 1 L. Stuttgé 2
1 CSNSM SNO - Centre de Sciences Nucléaires et de Sciences de la Matière
2 IPHC - Institut Pluridisciplinaire Hubert Curien
Abstract : The kinetic energy of a neutron is determined experimentally by measuring its time-of-flight and flight distance from the source to the detector. However, this determination is vitiated by errors since the exact location of the interaction of the neutron within the detector is unknown. Moreover, more than one interaction may be necessary for the deposited energy to reach the detector threshold. We compare the different existing energy determination methods and introduce the method which gives the minimum-variance unbiased estimator of the neutron energy. The method is based of the inversion of the detector response function, for which we propose a universal algorithm. It is shown that the precision of the new method does not deteriorate with the length of the detector, which opens the possibility of conceiving detectors with a higher efficiency.
Keywords : Inverse problem Penetration depth Time-of-flight vs energy Neutron detection Response function Backtracing
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Journal articles
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Submitted on : Tuesday, November 10, 2015 - 11:17:20 AM
Last modification on : Tuesday, July 16, 2019 - 9:02:07 AM

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A. Chietera, P. Désesquelles, L. Stuttgé. Improved method for the determination of neutron energies from their times-of-flight. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2016, 806, pp.212-220. ⟨10.1016/j.nima.2015.09.094⟩. ⟨in2p3-01226757⟩

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