%0 Journal Article
%T Cross section measurements of Gd-155,Gd-157(n,) induced by thermal and epithermal neutrons
%A n_TOF Collaboration (Mastromarco, M. et al
%A Domingo-Pardo, C.
%A Tain, J. L.
%J European Physical Journal A
%D 2019
%V 55
%N 1
%I Springer
%@ 1434-6001
%G English
%F n_TOFCollaborationMastromarco_etal2019
%O WOS:000456675600003
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3892), last updated on Fri, 08 Feb 2019 11:28:39 +0000
%X Neutron capture cross section measurements on Gd-155 and Gd-157 were performed using the time-of-flight technique at the n_TOF facility at CERN on isotopically enriched samples. The measurements were carried out in the n_TOF experimental area EAR1, at 185 m from the neutron source, with an array of 4 C6D6 liquid scintillation detectors. At a neutron kinetic energy of 0.0253 eV, capture cross sections of 62.2(2.2) and 239.8(8.4) kilobarn have been derived for Gd-155 and Gd-157, respectively, with up to 6% deviation relative to values presently reported in nuclear data libraries, but consistent with those values within 1.6 standard deviations. A resonance shape analysis has been performed in the resolved resonance region up to 181 eV and 307 eV, respectively for Gd-155 and Gd-157, where on average, resonance parameters have been found in good agreement with evaluations. Above these energies and up to 1 keV, the observed resonance-like structure of the cross section has been analysed and characterised. From a statistical analysis of the observed neutron resonances we deduced: neutron strength function of 2.01(28)x10-4 and 2.17(41)x10-4; average total radiative width of 106.8(14) meV and 101.1(20) meV and s-wave resonance spacing 1.6(2) eV and 4.8(5) eV for n + Gd-155 and n + Gd-157 systems, respectively.
%R 10.1140/epja/i2019-12692-7
%U https://arxiv.org/abs/1805.04149
%U https://doi.org/10.1140/epja/i2019-12692-7
%P 9 - 20pp