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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.
Improved Neutron Capture Cross Section Measurements with the n_TOF Total Absorption Calorimeter
E. Mendoza,V. Becares,A. Casado,D. Cano-Ott,M. Fernandez-Ordonez,E. Gonzalez-Romero,C. Guerrero,T. Martinez,J. J. Vidriales,J. Andrzejewski,J. Marganiec,J. Perkowski,L. Audouin,B. Berthier,L. Tassan-G 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The n_TOF collaboration operates a Total Absorption Calorimeter (TAC) [1] for measuring neutron capture cross-sections of low-mass and/or radioactive samples. The results obtained with the TAC have led to a substantial improvement of the capture cross sections of ^(237)Np and ^(240)Pu [2].The experience acquired during the first measurements has allowed us to optimize the performance of the TAC and to improve the capture signal to background ratio, thus opening the way to more complex and demanding measurements on rare radioactive materials. The new design has been reached by a series of detailed Monte Carlo simulations of complete experiments and dedicated test measurements. The new capture setup will be presented and the main achievements highlighted. KEYWORDS: ND2010, nuclear data, n\textunderscore TOF, background, Monte Carlo, neutron, time of flight, cross section, calorimeter, shielding, simulation, total absorption, gamma ray, neutron capture.