Cross section measurements of Gd-155,Gd-157(n,) induced by thermal and epithermal neutrons
Date Issued
2019-01-01
Author(s)
Mastromarco, M.
Manna, A.
Aberle, O.
Andrzejewski, J.
Audouin, L.
Bacak, M.
Balibrea, J.
Barbagallo, M.
Becvar, F.
Berthoumieux, E.
Billowes, J.
Bosnar, D.
Brown, A.
Caamano, M.
Calvino, F.
Calviani, M.
Cano-Ott, D.
Cardella, R.
Casanovas, A.
Castelluccio, D. M.
Cerutti, F.
Chen, Y. H.
Chiaveri, E.
Clai, G.
Colonna, N.
Cortes, G.
Cortes-Giraldo, M. A.
Cosentino, L.
Damone, L. A.
Diakaki, M.
Domingo-Pardo, C.
Dressler, R.
Dupont, E.
Duran, I.
Fernandez-Dominguez, B.
Ferrari, A.
Ferreira, P.
Finocchiaro, P.
Furman, V.
Gobel, K.
Garcia, A. R.
Gawlik, A.
Gilardoni, S.
Glodariu, T.
Goncalves, I. F.
Gonzalez-Romero, E.
Griesmayer, E.
Guerrero, C.
Gunsing, F.
Guglielmelli, A.
Harada, H.
Heinitz, S.
Heyse, J.
Jenkins, D. G.
Jericha, E.
Kappeler, F.
Kadi, Y.
Kalamara, A.
Kavrigin, P.
Kimura, A.
Kivel, N.
Knapova, I.
Kokkoris, M.
Krticka, M.
Kurtulgil, D.
Leal-Cidoncha, E.
Lederer, C.
Leeb, H.
Lerendegui-Marco, J.
Lonsdale, S. J.
Macina, D.
Marganiec, J.
Martinez, T.
Masi, A.
Massimi, C.
Mastinu, P.
Maugeri, E. A.
Mazzone, A.
Mendoza, E.
Mengoni, A.
Milazzo, P. M.
Mingrone, F.
Musumarra, A.
Negret, A.
Nolte, R.
Oprea, A.
Patronis, N.
Pavlik, A.
Perkowski, J.
Porras, I.
Praena, J.
Quesada, J. M.
Radeck, D.
Reifarth, R.
Rocchi, F.
Rubbia, C.
Ryan, J. A.
Sabate-Gilarte, M.
Saxena, A.
Schillebeeckx, P.
Schumann, D.
Sedyshev, P.
Smith, A. G.
Sosnin, N. V.
Stamatopoulos, A.
Tagliente, G.
Tain, J. L.
Tarifeno-Saldivia, A.
Tassan-Got, L.
Valenta, S.
Vannini, G.
Variale, V.
Vaz, P.
Ventura, A.
Vlachoudis, V.
Vlastou, R.
Wallner, A.
Warren, S.
Weiss, C.
Winants, R.
Woods, P. J.
Wright, T.
Zugec, P.
DOI
10.1140/epja/i2019-12692-7
Abstract
.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.