Refine
Year of publication
Document Type
- Article (33)
- Preprint (22)
- Part of a Book (3)
- Conference Proceeding (3)
- Working Paper (1)
Has Fulltext
- yes (62)
Is part of the Bibliography
- no (62)
Keywords
- Literatur (2)
- Augenchirurgie <Motiv> (1)
- Bachmann, Ingeborg (1)
- Blindheit <Motiv> (1)
- Bologna-Prozess (1)
- Breitbach, Joseph (1)
- CVID (1)
- Charge fluctuations (1)
- European Society for Immunodeficiencies (ESID) (1)
- Exzellenzinitiative (1)
Institute
- Physik (52)
- Medizin (5)
- Frankfurt Institute for Advanced Studies (FIAS) (1)
The accurate knowledge of the neutron-induced fission cross-sections of actinides and other isotopes involved in the nuclear fuel cycle is essential for the design of advanced nuclear systems, such as Generation-IV nuclear reactors. Such experimental data can also provide the necessary feedback for the adjustment of nuclear model parameters used in the evaluation process, resulting in the further development of nuclear fission models. In the present work, the 240Pu(n,f) cross-section was measured at CERN's n_TOF facility relative to the well-known 235U(n,f) cross section, over a wide range of neutron energies, from meV to almost MeV, using the time-of-flight technique and a set-up based on Micromegas detectors. This measurement was the first experiment to be performed at n_TOF's new experimental area (EAR-2), which offers a significantly higher neutron flux compared to the already existing experimental area (EAR-1). Preliminary results as well as the experimental procedure, including a description of the facility and the data handling and analysis, are presented.
Neutron-induced fission cross sections of 238U and 235U are used as standards in the fast neutron region up to 200 MeV. A high accuracy of the standards is relevant to experimentally determine other neutron reaction cross sections. Therefore, the detection effciency should be corrected by using the angular distribution of the fission fragments (FFAD), which are barely known above 20 MeV. In addition, the angular distribution of the fragments produced in the fission of highly excited and deformed nuclei is an important observable to investigate the nuclear fission process.
In order to measure the FFAD of neutron-induced reactions, a fission detection setup based on parallel-plate avalanche counters (PPACs) has been developed and successfully used at the CERN-n_TOF facility. In this work, we present the preliminary results on the analysis of new 235U(n,f) and 238U(n,f) data in the extended energy range up to 200 MeV compared to the existing experimental data.