Fission Fragment Yield, Cross Section and Prompt Neutron and Gamma Emission Data from Actinide Isotopes
Journal article, 2014

Recent experimental investigations on major and minor actinides at the JRC-IRMM are presented. Fission-fragment distributions of isotopes with vibrational resonances in the sub-threshold fission cross section, i. e. U-234,U-238, have been measured. For U-234, the impact of an increased neutron multiplicity for the heavy fragments with higher incident neutron energies has been studied as observed in experiment and also recently theoretically predicted. The impact is found to be noticeable on post-neutron mass yields, which are the relevant quantities for a-priori waste assessments. The fission cross sections for Pu-240,Pu-242 at threshold and in the plateau region are being investigated within the ANDES project. The results show some discrepancies to the ENDF/B-VII. 1 evaluation mainly for Pu-242 around 1 MeV, where the evaluation exhibits a resonance-like structure not observed so clearly in the present work. The requested target accuracy in design studies of innovative reactor concepts like Gen-IV is in the range of a few percent. In order to be able to respond to requests for measurements of prompt neutron and gamma-ray emission in fission JRC-IRMM has also invested in setting up a neutron and gamma-ray detector array. The neutron array is called SCINTIA and has so far been tested with Cf-252(SF). For gamma-ray multiplicity and spectrum measurements of Cf-252(SF) and U-235(n(th), f) lanthanum- and cerium-halide detectors were successfully used.

Author

F. J. Hambsch

Joint Research Centre (JRC), European Commission

S. Oberstedt

Joint Research Centre (JRC), European Commission

A. Al-Adili

Joint Research Centre (JRC), European Commission

Uppsala University

T. Brys

Joint Research Centre (JRC), European Commission

Robert Billnert

Joint Research Centre (JRC), European Commission

Chalmers, Fundamental Physics

C. Matei

National Physical Laboratory (NPL)

Joint Research Centre (JRC), European Commission

A. Oberstedt

Örebro University

P. Salvador-Castineira

Polytechnic University of Catalonia

Joint Research Centre (JRC), European Commission

A. Tudora

University of Bucharest

M. Vidali

Joint Research Centre (JRC), European Commission

Nuclear Data Sheets

0090-3752 (ISSN) 1095-9904 (eISSN)

Vol. 119 38-41

Subject Categories

Physical Sciences

DOI

10.1016/j.nds.2014.08.012

More information

Latest update

11/5/2020