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PTB-Berichte Neutronenphysik (N)

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Titel: Determination of neutron scattering cross sections of 9Be at energies between 7.10 MeV and 9.97 MeV
Autor(en): D. Schmidt, W. Mannhart und S. Khurana
Editor: Physikalisch-Technische Bundesanstalt
Report Typ: PTB-Report
Jahr: 2007
Dokument Nummer: PTB-N-55
Seite(n): 67
ISBN: ISBN 978-3-86509-670-8 ; ISSN 0936-0492
Zusammenfassung: Differential cross sections of elastic and inelastic neutron scattering on <sup>9</sup>Be were determined in the energy range from 7.10 MeV to 9.97 MeV at four 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 beryllium 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 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 one low-lying level at excitation energy 2.43 MeV. 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.
Bemerkung: Determination of neutron scattering cross sections of .sup.9.nosup.Be at energies between 7.10 MeV and 9.97 MeV ; (PTB-Bericht PTB-N-55)

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