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HK: Physik der Hadronen und Kerne

HK 32: Kernphysik/Spektroskopie

HK 32.8: Vortrag

Dienstag, 8. März 2005, 18:45–19:00, TU MA005

Mass Measurements of Radionuclides around the Proton Shell Closure Z=82 — •C. Weber^1,2, G. Audi³, D. Beck¹, K. Blaum^1,2, 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.