Evaluated nuclear data for nuclear sciences and astrophysics

by Prof. Naïma Amrani (Physics Department, Faculty of Sciences, Sétif-1 University, Algeria)

Wednesday 27 Apr 2016, 11:00 → 12:00 Europe/Rome

LAE meeting room (INFN-LNL)

Several nuclear data are needed to understand most important nuclear and astrophysics phenomena as thermonuclear processes in the Universe, the composition of our world: its structure, evolution, and eventual its fate. Nuclear data are important, for example, in the fusion of hydrogen, in the conversion of protons to neutrons during the collapse of the core of a massive star, in the capture of neutrons on heavy seeds above the surface of a newly formed neutron star.
The implications of nuclear processes are evident not only far out in space and back in time, but also in our everyday life. In many cases, predictions of simulations of such diverse phenomena depend sensitively on nuclear data.
For astrophysical simulations a wide variety of nuclear processes are needed including nuclear masses, capture reaction cross sections, weak decay rates, level densities.  The development in performed detectors arrays, intense beams of radioactive nuclei, traps for high precision mass measurements, and global nuclear models running on supercomputers, new data are being generated at an ever-increasing rate.
Unfortunately the experimental data covers only a small fraction of the entire required data. It is either insufficient, or even totally non-existent. Massive recourse to theoretical predictions is thus mandatory in many applications. The evaluation of needed data using theoretical model are an essential work to astrophysical modeling
In this presentation the different methods used for nuclear data evaluation are presented the structure of evaluated nuclear data file are explained and a brief description of different library are given. The calculations of some astrophysical quantities are illustrated.