Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 64: Struktur und Dynamik von Kernen
HK 64.3: Vortrag
Donnerstag, 7. März 2013, 14:45–15:00, HSZ-301
Nuclear structure studies of neutron-rich heavy nuclei by mass measurements of francium and radium isotopes — •Marco Rosenbusch — Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald
The mass is a unique property of an atomic nucleus reflecting its binding energy and thus the sum of all interactions at work. Precise measurements of nuclear masses especially of short-lived exotic nuclides provide important input for nuclear structure, nuclear astrophysics, tests of the Standard Model, and weak interaction studies. The Penning-trap mass spectrometer ISOLTRAP at the on-line isotope separator ISOLDE/CERN has been set up for precision mass measurements and continuously improved for accessing more exotic nuclides. The mass uncertainty is typically δ m / m=10−8 and the accessible half-life has been reduced to about 50 ms. In this contribution, the results of a measurement campaign of neutron-rich francium and radium isotopes will be presented, i.e. the masses of the isotopic chain of 224−233Fr and 233,234Ra, one of the most neutron-rich ensemble obtainable at ISOL facilities. The mass 234Ra denotes the heaviest mass ever measured with ISOLTRAP. Experimental data in the neutron-rich, heavy mass region is of great interest for studies of structural evolution far from stability, especially because the knowledge from nuclear mass models is scarce. The impact of the new data on the physics in this mass region as well as recent technical developments of ISOLTRAP will be discussed.