Bonn 2020 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 1: Invited Talks I
HK 1.2: Hauptvortrag
Montag, 30. März 2020, 11:45–12:15, H-HS X
Precision laser spectroscopy studies on exotic tin isotopes. — •Liss Vazquez Rodriguez — Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
The atomic nucleus is a complex many-body quantum system that possesses fundamental properties, such as spin and electromagnetic moments considered as valuable inputs for the determination and testing of nuclear models. The systematic investigation of these observables along an isotopic (isotonic) chain reveals progressive changes in structure with respect to the number of valence nucleons. The tin (Z=50) isotopes form the longest known isotopic chain in the nuclear landscape accessible to current experimental studies with the highest number of stable isotopes (ten). Therefore, they are in the center stage of this powerful line of inquiry.
High-resolution laser spectroscopy has been performed on a long sequence of tin species, spanning from N=58 to the very neutron-rich isotope 134Sn, using the COLLAPS instrumentation at ISOLDE- CERN. From the perturbation and splitting of the electronic energy levels by the nucleus, nuclear spin and electromagnetic moments have been extracted for 38 nuclei including 11 isomers. The quadrupole moments, determined with higher precision than former measurements, show regularities that will be discussed in the framework of “simple structure in complex nuclei”. Special attention will be paid to the 133Sn nucleus, one of the eight nuclei observed so far which has a single neutron outside a doubly-magic core, as a key for the investigation of single-particle characters away from stability.