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High-energy Neutron-induced Fission Cross Sections of Natural Lead and Bismuth-209
D. Tarrio,L. Tassan-Got,L. Audouin,B. Berthier,L. Ferrant,S. Isaev,C. Le Naour,C. Stephan,D. Trubert,S. David,I. Duran,C. Paradela,H. Alvarez-Pol,U. Abbondanno,K. Fujii,P. M. Milazzo,C. Moreau,G. Aert 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The CERN Neutron Time-Of-Flight (n_TOF) facility is well suited to measure small neutron-induced fission cross sections, as those of subactinides. The cross section ratios of ^(nat)Pb and ^(209)Bi relative to ^(235)U and ^(238)U were measured using PPAC detectors. The fragment coincidence method allows to unambiguously identify the fission events. The present experiment provides the first results for neutron-induced fission up to 1 GeV for ^(nat)Pb and ^(209)Bi. A good agreement with previous experimental data below 200 MeV is shown. The comparison with proton-induced fission indicates that the limiting regime where neutron-induced and proton-induced fission reach equal cross section is close to 1 GeV.
^(237)Np(n,f) Cross Section: New Data and Present Status
C. Paradela,L. Tassan-Got,L. Audouin,B. Berthier,L. Ferrant,S. Isaev,C. Le Naour,C. Stephan,D. Trubert,S. David,I. Duran,D. Tarrio,H. Alvarez-Pol,U. Abbondanno,K. Fujii,P. M. Milazzo,C. Moreau,G. Aert 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
In this document, we present the final result obtained at the n_TOF experiment for the neutron-induced fission cross section of the ^(237)Np, from the fission threshold up to 1 GeV. The method applied to get this result is brie y discussed. n_TOF data are compared to the last experimental measurements using other TOF facilities or the surrogate method, reported experiments performed with monoenergetic sources and the FISCAL systematic, including a discussion about the existing discrepancies.