Radiative neutron capture measurements at n_TOF (CERN). From advanced nuclear reactors to stellar nucleosynthesis.

por Cesar Domingo Pardo (IFIC)

martes 25 ene. 2005 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

There is a renewed interest on the accurate neutron capture cross section (CS) determination of the Lead and Bismuth isotopes. These CS are required on one side by nuclear engineers in order to design and develope the so called hybrid nuclear reactor for the energy production and waste transmutation. On the other side, these reactions are of great interest in nuclear astrophysics in order to elaborate stellar models, which account for the observed abundances of these isotopes in the stars. From the experimental viewpoint, the measurement of these (n,gamma) CS is very challenging for many reasons which will be discussed in this talk. Using a home hand-made detector, we have been able to measure these Cross Sections at the CERN n_TOF installation, overcoming one of the main uncertainty sources of two previous existing experiments. The new results of the 209Bi and 207Pb measured Cross Sections will be presented, as well as their implication in the field of the stellar nucleosynthesis and hybrid reactors.