Prompt Fission Neutron Emission in Resonance Fission of 239Pu

Journal Article · Tue May 24 00:00:00 EDT 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1945092· OSTI ID:20722644

Hambsch, Franz-Josef; Oberstedt, Stephan ^[1]; Varapai, Natallia; Serot, Olivier ^[2]; Zeinalov, Shakir ^[3]

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1. EC-JRC-Institute for Reference Materials and Measurements, Retieseweg 111, B-2440 Geel (Belgium)
2. CEA Cadarache, DEN/DER/SPRC/LEPh, F-13108 St. Paul-Lez-Durance (France)
3. Joint Institute for Nuclear Research (JINR), 141980 Dubna, Moscow Region (Russian Federation)

The prompt neutron emission probability from neutron-induced fission in the resonance region is being investigated at the time-of-flight facility GELINA of the IRMM. A double Frisch-gridded ionization chamber is used as a fission-fragment detector. For the data acquisition of both the fission-fragment signals as well as the neutron detector signals the fast digitization technique has been applied. For the neutron detection, large-volume liquid scintillation detectors from the DEMON collaboration are used. A specialized data analysis program taking advantage of the digital filtering technique has been developed to treat the acquired data.Neutron multiplicity investigations for actinides, especially in resonance neutron-induced fission, are rather scarce. They are, however, important for reactor control and safety issues as well as for understanding the basic physics of the fission process. Fission yield measurements on both 235U and 239Pu without prompt neutron emission coincidence have shown that fluctuation of the fission-fragment mass distribution exists from resonance to resonance, larger in the case of 235U. To possibly explain these observations, the question now is whether the prompt neutron multiplicity shows similar fluctuations with resonance energy.

• OSTI ID: 20722644
• Journal Information: AIP Conference Proceedings, Vol. 769, Issue 1; Conference: International conference on nuclear data for science and technology, Santa Fe, NM (United States), 26 Sep - 1 Oct 2004; Other Information: DOI: 10.1063/1.1945092; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DATA ACQUISITION
DATA ANALYSIS
DIGITAL FILTERS
FISSION
FISSION FRAGMENTS
FISSION YIELD
FLUCTUATIONS
IONIZATION CHAMBERS
LIQUID SCINTILLATION DETECTORS
MASS DISTRIBUTION
MULTIPLICITY
NEUTRON DETECTION
NEUTRON DETECTORS
NEUTRON EMISSION
NEUTRON REACTIONS
PLUTONIUM 239
PROMPT NEUTRONS
RESONANCE
RESONANCE NEUTRONS
TIME-OF-FLIGHT METHOD
URANIUM 235