TY  - JOUR
AU  - n_TOF Collaboration (Mastromarco, M. et al
AU  - Domingo-Pardo, C.
AU  - Tain, J. L.
PY  - 2019
DA  - 2019//
TI  - Cross section measurements of Gd-155,Gd-157(n,) induced by thermal and epithermal neutrons
T2  - Eur. Phys. J. A
JO  - European Physical Journal A
SP  - 9 - 20pp
VL  - 55
IS  - 1
PB  - Springer
AB  - 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.
SN  - 1434-6001
UR  - https://arxiv.org/abs/1805.04149
UR  - https://doi.org/10.1140/epja/i2019-12692-7
DO  - 10.1140/epja/i2019-12692-7
LA  - English
N1  - WOS:000456675600003
ID  - n_TOFCollaborationMastromarco_etal2019
ER  -