The \(\gamma\)-ray angular distribution in fast neutron inelastic scattering from iron

  • Roland Beyer
  • Mirco Dietz
  • Daniel Bemmerer
  • Arnd R. Junghans
  • Toni Kögler
  • Ralph Massarczyk
  • Stefan Müller
  • Konrad Schmidt
  • Ronald Schwengner
  • Tamás Szücs
  • Marcell P. Takács
  • Andreas Wagner
Regular Article - Experimental Physics
  • 6 Downloads

Abstract.

The angular distribution of \( \gamma\)-rays emitted after inelastic scattering of fast neutrons from iron was determined at the n ELBE neutron time-of-flight facility. An iron sample of natural isotopic composition was irradiated by a continuous photo-neutron spectrum in the energy range from about 0.1 up to 10 MeV. The de-excitation \(\gamma\)-rays of the four lowest excited states of 56Fe and the first excited state of 54Fe were detected using a setup of five high-purity germanium (HPGe) detectors and five LaBr3 scintillation detectors positioned around the sample at \( 30^\circ\) , \(55^{\circ}\), \(90^{\circ}\), \( 125^{\circ}\) and \(150^{\circ}\) with respect to the incoming neutron beam. The resulting angular distributions were fitted by Legendre polynomials up to 4th order and the angular distribution coefficients \(a_{2}\) and \( a_{4}\) were extracted. The angular distribution coefficients of three transitions in 56Fe are reported here for the first time. The results are applied to a previous measurement of the inelastic scattering cross section determined using a single HPGe detector positioned at \(125^{\circ}\). Using the updated \(\gamma\)-ray angular distribution, the previous cross section results are in good agreement with reference data.

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Copyright information

© SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Roland Beyer
    • 1
  • Mirco Dietz
    • 1
    • 2
  • Daniel Bemmerer
    • 1
  • Arnd R. Junghans
    • 1
  • Toni Kögler
    • 1
    • 2
  • Ralph Massarczyk
    • 1
    • 2
  • Stefan Müller
    • 1
  • Konrad Schmidt
    • 1
    • 2
  • Ronald Schwengner
    • 1
  • Tamás Szücs
    • 1
  • Marcell P. Takács
    • 1
  • Andreas Wagner
    • 1
  1. 1.Helmholtz-Zentrum Dresden - RossendorfDresdenGermany
  2. 2.Technische Universität DresdenDresdenGermany

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