![]() JEFF Scientific Working Group, Joint Evaluated Fission and Fusion File (JEFF) release 3.2. Shibata et al., JENDL-4.0: a new library for nuclear science and engineering. In this work we review and reevaluate the available experimental data on the spontaneous fission (SF) half-life of the Pu isotopes 238 Pu, 240 Pu and 242 Pu. Meet on Neutron Radiation Metrology, Moscow (1983)į. The 240 Pu spontaneous fission rate derives (and vice versa) from the 240 Pu spontaneous fission half-life. JCGM 100:2008, GUM 1995 with minor corrections Evaluation of Measurement Data-Guide to the Expression of Uncertainty in Measurement. International Organisation for Standardization (ISO). Amouroux, JEFF-Report 24 (Data Bank, Nuclear-Energy Agency, OECD, 2014)Ī.S. JRC Scientific and Technical Reports (2009) Birgersson and Göran Lövestam, NeuSDesc-Neutron Source Description Software Manual. Brown, Monte Carlo Techniques for Nuclear Systems-Theory Lectures. Gressier et al.,, Metrologia 51 (Suppl, Series, 2014), p. Salvatores et al., Report NEA/WPEC-26, Paris (2008) Wang, Evaluation of the neutron data standards. International evaluation of neutron cross section standards. Zhu, ENDF/B-VIII.0: The 8th major release of the nuclear reaction data library with cielo-project cross sections, new standards and thermal scattering data. Žerovnik, The joint evaluated fission and fusion nuclear data library, JEFF-3.3. Netter, Centre dÉtudes Nucleaires Report Series, No. Cierjacks, Report: Kernforschungszentrum Karlsruhe Reports No. ![]() The results confirm the most recent standard libraries at 2.51 and 14.83 MeV. In the near future data will be obtained at lower and higher photon energies.A measurement campaign to determine neutron induced fission cross sections of \(^\) in parallel. The use of the fission chamber with post-activation measurements has provided absolute fission product yield data with minimal uncertainties.Ĭonclusion: The photon-induced cumulative fission product yields of U 235, U 238, and Pu 239 are compared with previous photon- and neutron-induced fission measurements. More than 40 fission products were uniquely identified, and their yield values were computed. Results: We report on our photofission product yield measurements on U 235, U 238, and Pu 239 using a monoenergetic photon beam of E γ = 13 MeV. Gamma-ray counting of the activated targets was performed with well-shielded high-purity germanium (HPGe) detectors over a period of two months after irradiation to properly identify the decay history of fission products. The measurements were carried out with a monoenergetic photon beam at the HI γ S facility. Method: The photon-induced FPYs were measured by a combination of fission counting using a specially designed dual-fission chamber and γ-ray counting. To investigate whether this observation is unique to neutron-induced fission, a program has been initiated to measure FPYs in photon-induced fission. Purpose: In a collaboration between the Triangle Universities Nuclear Laboratory (TUNL), Los Alamos National Laboratory (LANL), and Lawrence Livermore National Laboratory (LLNL), the dependence of a number of cumulative FPYs on the incoming neutron energy has been measured and unexpected energy dependencies of certain fission products have been reported. Background: High-accuracy and self-consistent fission product yield (FPY) data are needed to advance microscopic/macroscopic descriptions of the nuclear fission process, to improve the predictive power of phenomenological models, and for applications in nuclear energy, nuclear forensics, and homeland security.
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