Ponente
Descripción
Tl-205 is most abundant stable isotope of thallium in the Earth. It is produced mainly during the slow (s) process of nucleosynthesis by neutron capture. During some stages of the s process, and due to the high temperatures involved, it becomes stable and decays to Pb-205. This isotope of lead is radioactive, and it is produced only by the s-process, and therefore it is thought that it could be used as a "clock" of the process. The Tl-205 abundance is strongly dependent on its neutron capture rate, and by means of the mechanism mentioned before, so it is the abundance of Pb-205. Having considered this, the ANT group of the UPC carried out the measurement of the capture cross section of Tl-205 in the n_TOF experiment at CERN this last summer, aiming to improve both the accuracy and precision of the cross section for nucleosynthesis calculations. In this talk, besides explaining more in detail the astrophyisical motivations, a description of the measurement process, and some preliminary results, will be shown.
