München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 57: Kernphysik/Spektroskopie
HK 57.2: Vortrag
Freitag, 24. März 2006, 14:15–14:30, C
Mass Measurements of Radionuclides around the Proton ShellClosure Z=82 — •C. Weber1,2, G. Audi3, D. Beck1, K. Blaum1,2, G. Bollen4, F. Herfurth1, H.-J. Kluge1, D. Lunney3, and S. Schwarz4 — 1GSI, D - 64291 Darmstadt — 2University of Mainz, D - 55099 Mainz — 3CSNSM, F - 91405 Orsay — 4NSCL, Michigan State University, USA
The Penning trap mass spectrometer ISOLTRAP allows for the precise mass determination of exotic nuclides far from stability with uncertainties δ m/m of about 10−8. The mass of an ion stored in a strong magnetic field is determined by a measurement of its cyclotron frequency. In this contribution recent results from mass measurements of heavy radionuclides around the proton shell closure Z = 82 are presented. Since the mass represents one of the most basic nuclear properties, precise systematic studies allow to conclude on the resulting size and shape of a given nuclide, as it manifests itself e.g. in the appearance of shape coexistence. With the advent of high-precision mass measurements using the ISOLTRAP spectrometer in some cases requiring isomeric resolution, it is possible to see a structure in the neutron pairing energy and to examine the relationship between masses and radii for correlations.