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Fission Cross Sections for Intermediate Neutron Energies


Neutron Induced Fission Cross-Sections of Pu-240, Am-243 and W in the Energy Range 1–200 MeV

Tech Area / Field

  • FIR-NOT/Nuclear and Other Technical Data/Fission Reactors
  • PHY-ANU/Atomic and Nuclear Physics/Physics

8 Project completed

Registration date

Completion date

Senior Project Manager
Glazova M B

Leading Institute
Nuclear Physics Institute, Russia, Leningrad reg., Gatchina

Supporting institutes

  • Khlopin Radium Institute, Russia, St Petersburg


  • Los Alamos National Laboratory, USA, NM, Los-Alamos

Project summary

The purpose of this Project is to obtain neutron-induced fission cross-sections for Pu-240, Am-243 and W by means of new measurements in the neutron energy range up to 200 MeV. The values of the cross-sections to be obtained are intended for use as nuclear data for accelerator-driven transmutation and energy production problem, as well as for the problem of secondary standard in intermediate energy region and some other applications. The participation of the former weapons scientists and engineers, both from PNPI and KRI, in the Project is suggested.

The experimental part of the Project includes preparation of fissile targets, measurements, experimental data processing and production of the neutron induced fission cross-sections for Pu-240, Am-243 and W relative to U-235 with an accuracy 3-10% in the energy range 1–200 MeV. The measurements will be carried out using neutron time-of-flight spectrometer GNEIS in Gatchina, where neutrons are produced through the pulsed throw of the 1 GeV proton beam from PNPI synchocyclotron on the internal lead target. Recently, within the framework of the Project 609, the fission cross-section ratios for U-233, U-238, Th-232, Np-237, Pu-239, Bi and Pb relative to U-235 have been measured using this facility.

At present, the world scientific community disposes only a few neutron sources suitable for the neutron cross-section measurements at intermediate energies. Such measurements are very expensive and therefore have a high priority within the framework of international cooperation. Besides scientists from Russia, the specialists from Nuclear Data Center of JAERI will be involved in the Project. It is anticipated that they will take part in preparation of evaluated data on fission cross-sections at intermediate energies, as well as participate in seminars and workshops during the course of the Project.


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