Fast neutron spectrum unfolding for nuclear nonproliferation and safeguards applications

Pozzi, S. A. and Xu, Y. and Zak, T. and Clarke, S. D. and Bourne, M. and Flaska, M. and Downar, T. J. and Peerani, P. and Protopopescu, V. (2010) Fast neutron spectrum unfolding for nuclear nonproliferation and safeguards applications. Il nuovo cimento C, 33 (1). pp. 207-214. ISSN 1826-9885

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We present new neutron spectrum unfolding results obtained from measurements with Cf-252 and plutonium-oxide sources. The precise knowledge of the neutron energy spectrum provides information about the presence or absence of fissile material and about the characteristics of the material. We used a neutron spectrum unfolding technique based on a modification of the least-squares method. The main innovation is the use of a Krylov subspace iteration which performs better on ill-conditioned systems of linear equations than standard direct-solution methods. The proposed technique performed well in the unfolding of measured neutron pulseheight distributions from a Cf-252 neutron source and from plutonium-oxide samples and could be easily implemented in a portable neutron spectroscopy system for nuclear nonproliferation and safeguard applications.

Item Type: Article
Uncontrolled Keywords: Neutron spectroscopy ; Scintillation detectors ; Spontaneous fission
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 31 Mar 2020 15:40
Last Modified: 31 Mar 2020 15:40

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