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Gamma-ray Measurements with LaBr3: Ce Detectors – thinking Outside the Box

Andreas Oberstedt (Institutionen för fundamental fysik, Subatomär fysik) ; Robert Billnert (Institutionen för fundamental fysik, Subatomär fysik) ; S. Oberstedt
Physics Procedia; 1st Workshop on the Emission of Prompt Gamma-Rays in Fission, GAMMA-1 2012; Novi Sad; Serbia; 26 November 2012 through 4 December 2012; Code 123513 (1875-3884). Vol. 31 (2012), p. 21-28.
[Konferensbidrag, refereegranskat]

Recently developed cerium-doped lanthanum bromide (LaBr3: Ce) scintillation detectors have shown to possess promising properties with respect to the detection of γ-rays compared to previously known materials. In this work however, we demonstrate how these detectors may be used to obtain information not only about γ-rays, but also about neutrons, i.e. thinking "inside" and "outside" the box, respectively. For this purpose γ-rays were detected in coincidence with fission fragments and both their energy and their time-of-flight relative to the instant of a fission event is recorded. By evaluating the time-of-flight distributions of γ-rays, identified as decays of excited states after population by inelastically scattered neutrons inside the scintillation crystal as well as other surrounding materials, we show that it is possible to acquire knowledge from and about the spectrum of incident neutrons. We give three examples for conceivable applications, used to determine geometrical profiles, cross sections and neutron spectra, respectively.

Nyckelord: Neutron measurements, Lanthanum bromide, Time-of-flight, 252Cf(sf), 79,81Br(n,n’), 235U(nth,f) 07.85.Nc, 29.30.Kv, 29.40.Mc



Denna post skapades 2013-01-14. Senast ändrad 2016-11-02.
CPL Pubid: 170562

 

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Institutioner (Chalmers)

Institutionen för fundamental fysik, Subatomär fysik (2005-2013)

Ämnesområden

Fysik
Subatomär fysik
Kärnfysik
Acceleratorfysik och instrumentering

Chalmers infrastruktur