Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 69: Anwendungen kernphysikalischer Methoden

HK 69.2: Vortrag

Freitag, 25. März 2011, 14:30–14:45, C-2

Fission γ-ray data measurements - a challenging endeavour — •Stephan Oberstedt¹, Robert Billnert^1,2, and Andreas Oberstedt^2,3 — ¹EC Joint Research Centre IRMM, Retieseweg 111, B-2440 Geel — ²Chalmers Tekniska Högskola, S-41296 Göteborg — ³Örebro Universitet, S-70182 Örebro

The OECD has published in its high priority data request list a demand for new 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 a responsible handling of nuclear waste with respect to heat production and toxicity. Prompt fission γ-rays can be used to study the configurations of fission fragments very close to the scission point and to better understand how the total excitation energy available in the fissioning system gets transferred to intrinsic excitation in the fragments. They should preferably be known as a function of fission-fragment mass and excitation energy. Existing experimental data, however, were obtained in the 1970s for the above mentioned isotopes. In order to arrive at new and precise correlated γ-ray emission data the problem of efficient neutron/γ-ray separation has to be solved. This is usually achieved by means of time-of-flight and the pulse-shape discrimination technique and requires excellent timing resolution of the measurement system. Additionally, high detection efficiency is required. The talk will discuss present activities on fission γ-ray measurements with a particular emphasis on state-of-the art fission-fragment and γ-ray detectors.