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Fission by Intermediate Neutrons

#0540


Measurements of Neutron Induced Fission Cross Sections in the Energy Region 20MeV

Tech Area / Field

  • PHY-ANU/Atomic and Nuclear Physics/Physics

Status
8 Project completed

Registration date
16.01.1996

Completion date
02.04.2001

Senior Project Manager
Kondratenkov Yu B

Leading Institute
Khlopin Radium Institute, Russia, St Petersburg

Collaborators

  • University of Uppsala / Department of Neutron Research, Sweden, Uppsala\nForschungszentrum Karlsruhe Technik und Umwelt / Institut für Neutronenphysik und Reaktortechnik, Germany, Karlsruhe

Project summary

For solving problems of safe and clean atomic power engineering based on accelera-tor-reactor technologies, particle radiation therapy in the treatment of cancer, space radiation effects etc. it is necessary to create the nuclear database for intermediate energy particlies. Neutron data are very sparse for energy above 20 MeV which is a limit of neutron spectrum of usual atomic reactors. This project is aimed to fill a lack of absolute fission cross sections for a wide set of nuclei from Au to Am considered either as nuclear wastes to be transmuted or as perspective target materials or as a base for secondary neutron standards. The energy range to be covered (15-160 MeV) is the most interesting for applications. The same range is also of great interest for modern nuclear fission problems concerning the role of dynamical effects and nuclear matter viscosity and their dependence on nuclear structure and excitation energy.

Measuremens will be performed at quasimono energetic neutron beams of the NG-400 facility at Radium Institute and neutron facility at The Svedberg Laboratory in Upp-sala (Sweden). The data obtained at the first accelerator (for the energy of about 15 MeV) will be absolutized by means of the technique of accompanying charged particles in the T(d,n)4He reaction. The data obtained at the second one (in the energy range of 50 160 MeV) will be absolutized by the use of both the n-p scattering and activation techniques in the 7Li (p,n) reaction which is used for neutron production. The quasimono energetic neutron source and a neutron flux monitoring setup provide unique possibilities for the absolute fission cross section measurements, which in the first time were used in our works. Together with an unique experimental technique for fission fragment detection developed at Radium Institute (thin film breakdown counters) as well as a modern fission fragment detector (twin Frish gridded ionizartion chamber) they will provide reliable experimental data with accuracy better than 10 %. These data, as completely independent ones, will be compared with results obtained at Los Alamos National Laboratory at the "white" neutron source WNR with the use of fast ionization chambers.


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