In the years 1978/79 and 1985/86, invited by Oriol Bohigas Marti, he has worked at the Institut de Physique Nucleaire in Orsay.
[1] In 2002, he established in Trento the Center on Bose –Einstein Condensation, founded by the Istituto Nazionale per la Fisica della Materia (INFM), and now part of CNR.
In the first period of his scientific career Sandro Stringari focused on the magnetic properties of atomic nuclei and on the isospin degree of freedom, developing the innovative sum rule approach to the collective excitations.
Major contributions of this period are the study of the evaporation mechanism of helium clusters [3] and the T=0 extension of the Hohenberg-Mermin-Wagner theorem.
[6] This contribution had a major impact on the first generation of experiments on ultra cold quantum gases and influenced an important line of theoretical work.