Abstract
In a recent measurement of prompt γ rays from the spontaneous fission of 252Cf an experimental setup was chosen that allowed the study of angular correlations between γ rays and the nuclei from which they were emitted. The observed angular distribution of the prompt fission γ rays was then analyzed to estimate the relative contributions from radiation of different multipolarity. From that we hope to obtain more detailed information about the early stage of the de-excitation process of fission fragments, right after prompt neutron emission. First preliminary results are presented below.
Highlights
Nuclear fission is a complex process, which – after almost 80 years since its discovery – is still not fully understood
One field of research is for instance studies of the de-excitation of fission fragments, which in the early stages takes place through the successive emission of prompt neutrons and γ rays
Information about the prompt neutrons is crucial for calculating the reactivity in reactors, while precise knowledge about the prompt γ rays is important for the assessment of the decay heat released in the reactor core
Summary
Nuclear fission is a complex process, which – after almost 80 years since its discovery – is still not fully understood. Information about the prompt neutrons is crucial for calculating the reactivity in reactors, while precise knowledge about the prompt γ rays is important for the assessment of the decay heat released in the reactor core Concerning the latter we have contributed in the past years with a number of precise measurements of prompt γ-ray spectra from the spontaneous [1,2,3] as well as thermal [4,5,6] and fast neutron [7, 8] induced fission of various compound systems. We report on this recent measurement, present the observed angular distribution and give first preliminary results
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