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Double-differential-cross-section measurements of neutron scattering on Fe56

G. Gkatis1,2,3,*, M. Diakaki2, G. Noguere1, A. Oprea3, C. Paradela3, E. Pirovano4, and A. J. M. Plompen3

  • *Contact author: georgios.gkatis@ec.europa.eu
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Phys. Rev. C 112, 044603 – Published 6 October, 2025

DOI: https://doi.org/10.1103/b5n2-9kxn

Abstract

Measurements of neutron elastic and inelastic scattering on Fe56 were performed at the Geel Electron Linear Accelerator (GELINA) of the EC-JRC. A highly enriched Fe56 scattering sample was used to minimize the contribution of minor iron isotopes, ensuring the extraction of precise scattering cross-section data. The time-of-flight technique was utilized to determine the neutron incident energies, with scattered neutrons detected using the ELastic and Inelastic Scattering Array (ELISA), consisting of 32 liquid organic scintillators capable of neutron-photon discrimination via pulse-shape analysis, while a U235 fission chamber was used to monitor the neutron fluence. The detectors are arranged into four arms, each comprising eight detectors at fixed angular positions relative to the neutron beam direction, facilitating the computation of both the angular distributions and the integral cross sections with the Gauss-Legendre quadrature. For elastic scattering, angular distributions, integral cross sections, and Legendre coefficients were determined across the energy range of 1 to 8 MeV. In the case of inelastic scattering, partial differential and angle-integrated cross sections from the first and the second excited states of Fe56 were extracted in the energy regions from 2 to 5 MeV and from 3 to 6 MeV, respectively. Additionally, the total cross section was estimated in the energy interval from 2 to 2.5 MeV. The results of this work were compared with available experimental data, the most recent evaluated nuclear data libraries, and theoretical calculations performed using the talys 1.9 code.

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Phys. Rev. C 112, 044603– Published 6 October, 2025
  • Received 19 May 2025
  • Accepted 7 July 2025
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