TITLE

Statistical Model Analysis of (n,p) Cross Sections and Average Energy For Fission Neutron Spectrum

AUTHOR(S)
Odsuren, M.; Khuukhenkhuu, G.
PUB. DATE
June 2011
SOURCE
AIP Conference Proceedings;6/28/2011, Vol. 1342 Issue 1, p59
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Investigation of charged particle emission reaction cross sections for fast neutrons is important to both nuclear reactor technology and the understanding of nuclear reaction mechanisms. In particular, the study of (n,p) cross sections is necessary to estimate radiation damage due to hydrogen production, nuclear heating and transmutations in the structural materials of fission and fusion reactors. On the other hand, it is often necessary in practice to evaluate the neutron cross sections of the nuclides for which no experimental data are available. Because of this, we carried out the systematical analysis of known experimental (n,p) and (n,a) cross sections for fast neutrons and observed a systematical regularity in the wide energy interval of 6-20 MeV and for broad mass range of target nuclei. To explain this effect using the compound, pre-equilibrium and direct reaction mechanisms some formulae were deduced. In this paper, in the framework of the statistical model known experimental (n,p) cross sections averaged over the thermal fission neutron spectrum of U-235 are analyzed. It was shown that the experimental data are satisfactorily described by the statistical model. Also, in the case of (n,p) cross sections the effective average neutron energy for fission spectrum of U-235 was found to be around 3 MeV.
ACCESSION #
61979027

 

Related Articles

  • On Nuclear Structure Effects in the Nucleon-Induced Fission Cross Sections of Nuclei near 208Pb at Intermediate Energies. Eysmont, Vilen P.; Filatov, Nikolay P.; Smirnov, Andrey N.; Tutin, Gennady A.; Blomgren, Jan; Condé, Henri; Olsson, Nils; Duijvestijn, Marieke; Koning, Arjan // AIP Conference Proceedings;2005, Vol. 769 Issue 1, p629 

    Recently measured energy dependences of fission cross sections of lead isotopes 204,206–208Pb at incident nucleon energies up to 180 MeV were analyzed. Regularities were established of the fission cross-section variation with the mass number of isotopes pointing to incomplete dumping of...

  • Influence of fission fragment excitation energy on prompt fission neutron observables. Lemaire, S.; Talou, P.; Kawano, T.; Chadwick, M. B.; Madland, D. G. // AIP Conference Proceedings;2005, Vol. 798 Issue 1, p213 

    We have implemented a Monte-Carlo simulation of the statistical decay of fission fragments by sequential neutron emission. In this presentation, we report on some numerical results obtained for the spontaneous fission of 252Cf and neutron-induced fission of 235U at 0.53 MeV neutron energy, and...

  • The microscopic theory of fission. Younes, W.; Gogny, D. // AIP Conference Proceedings;10/15/2009, Vol. 1175 Issue 1, p3 

    Fission-fragment properties have been calculated for thermal neutron-induced fission on a 239Pu target, using constrained Hartree-Fock-Bogoliubov calculations with a finite-range effective interaction. A quantitative criterion based on the interaction energy between the nascent fragments is...

  • Cross Sections for γ-Ray Production in the 191Ir(n,xnγ) Reactions. Fotiades, N.; Nelson, R. O.; Devlin, M.; Chadwick, M. B.; Talou, P.; Becker, J. A.; Garrett, P. E.; Younes, W. // AIP Conference Proceedings;2005, Vol. 769 Issue 1, p898 

    Discrete γ-ray spectra have been measured for nuclei populated in 191Ir(n,xnγ) reactions, with x ≤ 11, as a function of incident neutron energy using neutrons from the “white” neutron source at the Los Alamos Neutron Science Center’s WNR facility. The energy of the...

  • Beta-Delayed Two-Particle Emission. Borge, M. J. G. // AIP Conference Proceedings;2000, Vol. 518 Issue 1, p264 

    Provides information on the panorama of beta-delayed multiparticle emission. Application of new technologies to explain the mechanism of beta-delayed two-proton emission; Use of low energy beams to produce point-like sources that allows to extract information; Processes of beta-delayed particle...

  • Model of multiparticle preequilibrium decay. Grudzevich, O.; Yavshits, S. // Physics of Atomic Nuclei;Oct2011, Vol. 74 Issue 10, p1383 

    The possibility of calculating the spectra of several sequentially emitted nucleons was implemented on the basis of the exciton model of the preequilibriumdecay of a nucleus bymeans of a Monte Carlo simulation. A method for determining the instant of statistical equilibration in a composite...

  • Neutron emission in fission of 252Cf(sf). Zeynalov, Sh.; Hambsch, F.-J.; Oberstedt, S.; Fabry, I. // AIP Conference Proceedings;10/15/2009, Vol. 1175 Issue 1, p359 

    The prompt neutron emission in spontaneous fission of 252Cf has been investigated applying digital signal electronics. The goal was to compare the results of this digital data acquisition and digital signal processing analysis to the results of the pioneering work of Budtz-Jo\rgensen and...

  • Spontaneous fission half-lives of heavy and superheavy nuclei. Zhongzhou Ren; Chang Xu // AIP Conference Proceedings;10/15/2009, Vol. 1175 Issue 1, p119 

    The spontaneous fission half-lives of heavy and superheavy nuclei from 232Th to 286114 are calculated within the parabolic potential approximation by taking nuclear structure effects into account [Phys. Rev. C 78, 044329 (2008)]. The agreement between theoretical results and the newly observed...

  • QGSM development for spallation reactions modeling. Baznat, M. I.; Chigrinov, S. E.; Gudima, K. K. // EPJ Web of Conferences;2012, Issue 38, p17003-p.1 

    The growing interest in spallation neutron sources, accelerator-driven systems, R&D of rare isotope beams, and development of external beam radiation therapy necessitated the improvement of nuclear reaction models for both stand-alone codes for the analysis of nuclear reactions and event...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics