Neutron capture cross section measurement of Sm-151 at the CERN neutron time of flight facility (n_TOF)
Author
Abbondanno, U.
Aerts, G.
Alvarez-Velarde, F.
Alvarez-Pol, H.
Andriamonje, S.
Andrzejewski, J.
Badurek, G.
Baumann, P.
Becvar, F.
Benlliure, J.
Berthoumieux, E.
Calvino, F.
Cano-Ott, D.
Capote, R.
Cennini, P.
Chepel, V.
Chiaveri, E.
Colonna, N.
Cortes, G.
Cortina, D.
Couture, A.
Cox, J.
Dababneh, S.
Dahlfors, M.
David, S.
Dolfini, R.
Domingo-Pardo, C.
Duran, R.B.
Embid-Segura, M.
Ferrant, L.
Ferrari, A.
Ferreira-Marques, R.
Frais-Koelbl, H.
Furman, W.
Goncalves, I. F.
Gallino, R.
Gonzalez-Romero, E.
Goverdovski, A.
Gramegna, F.
Griesmayer, E.
Gunsing, F.
Haas, B.
Haight, R.
Heil, M.
Herrera-Martinez, A.
Isaev, S.
Jericha, E.
Kappeler, F.
Kadi, Y.
Rauscher, T.
n TOF Collaboration
Attention
2299/12479
Abstract
The Sm-151(n,gamma)Sm-152 cross section has been measured at the spallation neutron facility n_TOF at CERN in the energy range from 1 eV to 1 MeV. The new facility combines excellent resolution in neutron time-of-flight, low repetition rates, and an unsurpassed instantaneous luminosity, resulting in rather favorable signal/background ratios. The Sm-151 cross section is of importance for characterizing neutron capture nucleosynthesis in asymptotic giant branch stars. At a thermal energy of kT=30 keV the Maxwellian averaged cross section of this unstable isotope (t(1/2)=93 yr) was determined to be 3100+/-160 mb, significantly larger than theoretical predictions.