Isotopic yield measurement in the heavy mass region for {sup 239}Pu thermal neutron induced fission
- CEA, DEN-Cadarache, F-13108 Saint-Paul-lez-Durance (France)
Despite the huge number of fission yield data available in the different evaluated nuclear data libraries, such as JEFF-3.1.1, ENDF/B-VII.0, and JENDL-4.0, more accurate data are still needed both for nuclear energy applications and for our understanding of the fission process itself. It is within the framework of this that measurements on the recoil mass spectrometer Lohengrin (at the Institut Laue-Langevin, Grenoble, France) was undertaken, to determine isotopic yields for the heavy fission products from the {sup 239}Pu(n{sub th},f) reaction. In order to do this, a new experimental method based on {gamma}-ray spectrometry was developed and validated by comparing our results with those performed in the light mass region with completely different setups. Hence, about 65 fission product yields were measured with an uncertainty that has been reduced on average by a factor of 2 compared to that previously available in the nuclear data libraries. In addition, for some fission products, a strongly deformed ionic charge distribution compared to a normal Gaussian shape was found, which was interpreted as being caused by the presence of a nanosecond isomeric state. Finally, a nuclear charge polarization has been observed in agreement, with the one described on other close fissioning systems.
- OSTI ID:
- 21596756
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 84, Issue 3; Other Information: DOI: 10.1103/PhysRevC.84.034605; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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ATOMIC NUMBER
CHARGE DISTRIBUTION
FISSION PRODUCTS
FISSION YIELD
MASS
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NEUTRON REACTIONS
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PLUTONIUM 239
POLARIZATION
RECOILS
SPECTROSCOPY
THERMAL NEUTRONS
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
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NEUTRONS
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
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NUCLEON REACTIONS
NUCLEONS
PLUTONIUM ISOTOPES
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SPECTROMETERS
SPONTANEOUS FISSION RADIOISOTOPES
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