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Title of article :
Dual-fission chamber and neutron beam characterization for fission product yield measurements using monoenergetic neutrons
Author/Authors :
Bhatia، نويسنده , , C. and Fallin، نويسنده , , B. and Gooden، نويسنده , , M.E. and Howell، نويسنده , , C.R. and Kelley، نويسنده , , J.H. and Tornow، نويسنده , , W. and Arnold، نويسنده , , C.W. and Bond، نويسنده , , E.M. and Bredeweg، نويسنده , , T.A. and Fowler، نويسنده , , M.M. and Moody، نويسنده , , W.A. and Rundberg، نويسنده , , R.S. and Rusev، نويسنده , , L. G. T. Vieira، نويسنده , , D.J. and Wilhelmy، نويسنده , , J.B. and Becker، نويسنده , , J.A. and Macri، نويسنده , , R. and Ryan، نويسنده , , C. and Sheets، نويسنده , , S.A. and Stoyer، نويسنده , , M.A. and Tonchev، نويسنده , , A.P.، نويسنده ,
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Abstract :
A program has been initiated to measure the energy dependence of selected high-yield fission products used in the analysis of nuclear test data. We present out initial work of neutron activation using a dual-fission chamber with quasi-monoenergetic neutrons and gamma-counting method. Quasi-monoenergetic neutrons of energies from 0.5 to 15 MeV using the TUNL 10 MV FM tandem to provide high-precision and self-consistent measurements of fission product yields (FPY). The final FPY results will be coupled with theoretical analysis to provide a more fundamental understanding of the fission process. To accomplish this goal, we have developed and tested a set of dual-fission ionization chambers to provide an accurate determination of the number of fissions occurring in a thick target located in the middle plane of the chamber assembly. Details of the fission chamber and its performance are presented along with neutron beam production and characterization. Also presented are studies on the background issues associated with room-return and off-energy neutron production. We show that the off-energy neutron contribution can be significant, but correctable, while room-return neutron background levels contribute less than < 1 % to the fission signal.
Keywords :
Fission product yields , Dual-fission chamber , neutron production , Beam characterization
Journal title :
Astroparticle Physics
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