• Open Access

Prompt fission γ-ray spectrum characteristics from Pu240(sf) and Pu242(sf)

S. Oberstedt, A. Oberstedt, A. Gatera, A. Göök, F.-J. Hambsch, A. Moens, G. Sibbens, D. Vanleeuw, and M. Vidali
Phys. Rev. C 93, 054603 – Published 4 May 2016

Abstract

In this paper we present first results for prompt fission γ-ray spectra (PFGS) characteristics from the spontaneous fission (sf) of Pu240 and Pu242. For Pu242(sf) we obtained, after proper unfolding of the detector response, an average energy per photon ε¯γ=(0.843±0.012) MeV, an average multiplicity M¯γ=(6.72±0.07), and an average total γ-ray energy release per fission E¯γ,tot = (5.66 ± 0.06) MeV. The Pu240(sf) emission spectrum was obtained by applying a so-called detector-response transformation function determined from the Pu242 spectrum measured in exactly the same geometry. The results are an average energy per photon ε¯γ=(0.80±0.07) MeV, the average multiplicity M¯γ = (8.2 ± 0.4), and an average total γ-ray energy release per fission E¯γ,tot = (6.6 ± 0.5) MeV. The PFGS characteristics for Pu242(sf) are in very good agreement with those from thermal-neutron-induced fission on Pu241 and scales well with the corresponding prompt neutron multiplicity. Our results in the case of Pu240(sf), although drawn from a limited number of events, show a significantly enhanced average multiplicity and average total energy, but may be understood from a different fragment yield distribution in Pu240(sf) compared to that of Pu242(sf).

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  • Received 2 March 2016

DOI:https://doi.org/10.1103/PhysRevC.93.054603

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

S. Oberstedt1,*, A. Oberstedt2, A. Gatera1, A. Göök1, F.-J. Hambsch1, A. Moens1, G. Sibbens1, D. Vanleeuw1, and M. Vidali1

  • 1European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Retieseweg 111, 2440 Geel, Belgium
  • 2Fundamental Fysik, Chalmers Tekniska Högskola, 41296 Göteborg, Sweden

  • *Corresponding author: stephan.oberstedt@ec.europa.eu

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Vol. 93, Iss. 5 — May 2016

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