par Larsen, André;Burger, Arnold;Görgen, Andreas;Guttormsen, Magne;Hagen, T.W.;Nyhus, Hilde Therese;Rekstad, John J.B.;Renstrøm, Therese;Rose, Steven S.J.;Ruud, I.E.;Siem, Sunniva;Syed, Naeem Ul Hasan;Toft, H.K.;Tveten, G.M.;Wikan, K.;Goriely, Stéphane ;Algin, E;Agvaanluvsan, Undraa;Lonnroth, Tom;Mitchell, Gerardine;Schiller, Andreas;Voinov, A.
Référence AIP Conference Proceedings, 1377, page (239-246)
Publication Publié, 2011
Référence AIP Conference Proceedings, 1377, page (239-246)
Publication Publié, 2011
Article révisé par les pairs
Résumé : | The nuclear γ-ray strength function is one of the indispensable inputs needed for reaction-rate calculations, and is particularly important for the neutron-capture cross section. The nuclear physics group at the Oslo Cyclotron Laboratory has developed a method to extract simultaneously nuclear level density and γ-ray strength function from particle-γ coincidence measurements. Data on the strength functions of Sn nuclei as well as for lighter elements are presented. The Sn isotopes all display a resonance-like structure close to the neutron threshold, that could possibly be due to the neutron-skin oscillation mode. This so-called pygmy dipole resonance greatly influences the neutron-capture rates. In the lighter nuclei, an enhancement of the strength function at low γ energies is observed. The possible impact of this increase on Maxwellian-averaged reaction rates has been investigated. © 2011 American Institute of Physics. |