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Title: Determination of differential elastic and inelastic and double-differential neutron scattering cross sections of 93Nb at Energies between 7.10 MeV and 14.10 MeV
Author(s): D. Schmidt and W. Mannhart
Editor: Physikalisch-Technische Bundesanstalt
Report type: PTB-Report
Year: 2007
Document number: PTB-N-56
Pages: 56
ISBN: ISBN 978-3-86509-671-5 ; ISSN 0936-0492
Abstract: Differential cross sections of elastic and inelastic neutron scattering on <sup>93</sup>Nb were determined in the energy range from 7.10 MeV to 14.10 MeV at eight incident energies. The data were derived by comparing the net time-of-flight spectra with calculated spectra using a realistic Monte Carlo simulation. The time-of-flight measurement was accompanied by extensive and careful calibrations. The niobium cross sections have been normalized to hydrogen scattering. The disturbing breakup scattering fraction of the non-monoenergetic DD neutron source can be subtracted after having been calculated by a Monte Carlo simulation. The data for such a calculation are checked and adjusted using an additional pure breakup neutron source based on the <sup>4</sup>He(d,np)<sup>4</sup>He reaction. By proper subtraction of the breakup fractions, double-differential cross sections can be obtained for neutron emission energies down to 1.5 MeV. Partial inelastic cross sections could be determined for a number of low-lying levels or level groups of <sup>93</sup>Nb. Angle-integrated cross sections were derived by fitting Legendre polynomial expansions to the measured angular distributions using least-squares methods. The results of this work have been compared with those of other authors and with the ENDF/B-VI evaluation.
Note: Determination of differential elastic and inelastic and double-differential neutron scattering cross sections of .sup.93.nosup.Nb at Energies between 7.10 MeV and 14.10 MeV ; (PTB-Bericht PTB-N-56)

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