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Y. Ayyad,J. Benlliure,E. Casarejos,H. Alvarez-Pol,C. Paradela,D. Perez-Loureiro,D. Tarrio,A. Bacquias,T. Enqvist,V. Fohr,A. Kelic,R. Pleskac,A. Boudard,,K. Kezzar,S. Leray 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Total fission cross sections of ^(181)Ta ions colliding with hydrogen atoms at 300, 500, 800, and 1000 A MeV have been measured. The combined use of the inverse kinematics technique with an efficient detection set-up made it possible to determine these cross sections with high accuracy ranging between 8% and 17%. The new data put some light in the controversial results obtained so far and contribute to the understanding of the fission process at high excitation energies.
Improved fission neutron energy discrimination with <sup>4</sup>He detectors through pulse filtering
Zhu, Ting,Liang, Yinong,Rolison, Lucas,Barker, Cathleen,Lewis, Jason,Gokhale, Sasmit,Chandra, Rico,Kiff, Scott,Chung, Heejun,Ray, Heather,Baciak, James E.,Enqvist, Andreas,Jordan, Kelly A. Elsevier 2017 Nuclear Instruments & Methods in Physics Research. Vol.848 No.-
<P><B>Abstract</B></P> <P>This paper presents experimental and computational techniques implemented for <SUP>4</SUP>He gas scintillation detectors for induced fission neutron detection. Fission neutrons are produced when natural uranium samples are actively interrogated by 2.45MeV deuterium-deuterium fusion reaction neutrons. Fission neutrons of energies greater than 2.45MeV can be distinguished by their different scintillation pulse height spectra since <SUP>4</SUP>He detectors retain incident fast neutron energy information. To enable the preferential detection of fast neutrons up to 10MeV and suppress low-energy event counts, the detector photomultiplier gain is lowered and trigger threshold is increased. Pile-up and other unreliable events due to the interrogating neutron flux and background radiation are filtered out prior to the evaluation of pulse height spectra. With these problem-specific calibrations and data processing, the <SUP>4</SUP>He detector's accuracy at discriminating fission neutrons up to 10MeV is improved and verified with <SUP>252</SUP>Cf spontaneous fission neutrons. Given the <SUP>4</SUP>He detector's ability to differentiate fast neutron sources, this proof-of-concept active-interrogation measurement demonstrates the potential of special nuclear materials detection using a <SUP>4</SUP>He fast neutron detection system.</P>