Estimation of neutron energy distributions from prompt gamma emissions

P, Priyada and Udupi, Ashwini and P.K, Sarkar (2017) Estimation of neutron energy distributions from prompt gamma emissions. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 871 (1). pp. 83-89. ISSN 0168-9002

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Abstract

A technique of estimating the incident neutron energy distribution from emitted prompt gamma intensities from a system exposed to neutrons is presented. The emitted prompt gamma intensities or the measured photo peaks in a gamma detector are related to the incident neutron energy distribution through a convolution of the response of the system generating the prompt gammas to mono-energetic neutrons. Presently, the system studied is a cylinder of high density polyethylene (HDPE) placed inside another cylinder of borated HDPE (BHDPE) having an outer Pb-cover and exposed to neutrons. The emitted five prompt gamma peaks from hydrogen, boron, carbon and lead can be utilized to unfold the incident neutron energy distribution as an under-determined deconvolution problem. Such an under-determined set of equations are solved using the genetic algorithm based Monte Carlo de-convolution code GAMCD. Feasibility of the proposed technique is demonstrated theoretically using the Monte Carlo calculated response matrix and intensities of emitted prompt gammas from the Pb-covered BHDPE–HDPE system in the case of several incident neutron spectra spanning different energy ranges.

Item Type: Article
Uncontrolled Keywords: Prompt gammaNeutron spectrum estimationUnfoldingGenetic algorithmGAMCD codeFLUKA codeMonte carlo simulation
Subjects: Departments at MU > Manipal Centre for Natural Sciences
Depositing User: MCNS Editor
Date Deposited: 31 Aug 2017 08:59
Last Modified: 31 Aug 2017 08:59
URI: http://eprints.manipal.edu/id/eprint/149622

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