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^(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.
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.
Sirakov, I.,Capote, R.,Gritzay, O.,Kim, H. I.,Kopecky, S.,Kos, B.,Paradela, C.,Pronyaev, V. G.,Schillebeeckx, P.,Trkov, A. Springer 2017 European Physical Journal A Vol.53 No.10
<P>Cross sections for neutron interactions with U-238 in the energy region from 5 keV to 150 keV have been evaluated. Average total and capture cross sections have been derived from a least squares analysis using experimental data reported in the literature. The resulting cross sections have been parameterised in terms of average resonance parameters maintaining full consistency with results of optical model calculations by using a dispersive coupled channel optical model potential. The average compound partial cross sections have been expressed in terms of transmission coefficients by applying the Hauser-Feshbach statistical reaction theory including width-fluctuations. A generalized single-level representation compatible with the energy-dependent options of the ENDF-6 format has been applied using standard boundary conditions. The results have been transferred into a full ENDF-6 compatible data file.</P>
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.