https://doi.org/10.1140/epja/i2018-12492-7
Regular Article - Experimental Physics
The 
-ray angular distribution in fast neutron inelastic scattering from iron
1
Helmholtz-Zentrum Dresden - Rossendorf, Bautzner Landstr. 400, 01328, Dresden, Germany
2
Technische Universität Dresden, 01062, Dresden, Germany
* e-mail: roland.beyer@hzdr.de
Received:
20
November
2017
Accepted:
12
March
2018
Published online:
17
April
2018
The angular distribution of 
-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 -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 
, 
, 
, 
and 
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 
and 
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 
. Using the updated -ray angular distribution, the previous cross section results are in good agreement with reference data.
© SIF, Springer-Verlag GmbH Germany, part of Springer Nature, 2018
