Abstract
Since its start in 2001 the n_TOF collaboration developed a measurement program on fission, in view of advanced fuels in new generation reactors. A special effort was made on measurement of cross sections of actinides, exploiting the peculiarity of the n_TOF neutron beam which spans a huge energy domain, from the thermal region up to GeV. Moreover fission fragment angular distributions have also been measured. An overview of the cross section results achieved with different detectors is presented, including a discussion of the 237Np case where discrepancies showed up between different detector systems. The results on the anisotropy of the fission fragments and its implication on the mechanism of neutron absorption, and in applications, are also shown.
Highlights
The fission measurements at n_TOF have been carried out with different detection systems: ionisation chambers, μMegas detectors, parallel plate avalanche counters (PPAC)
Rubbia proposed to use the CERN/PS synchrotron, accelerating protons up to 20 GeV/c, to produce an intense neutron source based on the spallation of lead [1]
The n_TOF facility was commissioned in 2001 [2, 3] with the long horizontal flight path leading to experimental area EAR1
Summary
The fission measurements at n_TOF have been carried out with different detection systems: ionisation chambers, μMegas detectors, parallel plate avalanche counters (PPAC). The cross section was the main topic, other quantities as the prompt γ emission and the angular distribution of fission fragments have been measured. The scope of this presentation is to illustrate some of the measurements done recently. In the case of EAR1 a borated water moderator has been used for the capture measurements to reduce the photon background produced by capture in the water. This wide energy range is very suitable for fission measurements
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