Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 64: Instrumentation

HK 64.8: Talk

Friday, March 23, 2012, 16:00–16:15, P 2

Correlated prompt fission γ-ray data measurements — •Stephan Oberstedt¹, Robert Billnert^1,2, and Andreas Oberstedt² — ¹European Commission, Joint Research Centre, IRMM, 2440 Geel, Belgium — ²Fundamental Fysik - Chalmers Tekniska Högskola, 41296 Göteborg, Sweden

The OECD-NEA has published in its recent high priority data request list a demand for new and precise data on prompt fission γ-ray emission for the standard actinide isotopes ²³⁵U and ²³⁹Pu in view of their importance for the development of future nuclear fission applications and for a responsible handling of nuclear waste during an a-priori assessment of the fission-fragments’ heat production and toxicity. Prompt fission γ-rays, together with prompt neutrons, represent very powerful probes of the nuclear fission process near the scission point. They provide information to better understand how the total excitation energy available in the fissioning system gets transferred to intrinsic excitation in the fragments. Prompt fission γ-rays should preferably be known as a function of fission-fragment mass and excitation energy, but existing experimental data date back to the early 1970s for the above mentioned isotopes. We have performed a detailed feasibility study on novel lanthanum-halide and cerium-bromide detectors with a particular focus on their corresponding time and energy resolution, essential parameters to arrive at a set-up with high detection efficiency in conjunction with a high neutron/γ-ray separation power. New prompt fission γ-ray spectra from the reactions ²⁵²Cf(SF) and ²³⁵U(n_th, f) will be presented.