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Abstract:
The mass is a unique fingerprint of each nucleus as it reflects the sum of all interactions
within it. Comparing experimental mass values with theoretical calculations provides
an important benchmark of how well the role of these interactions is already understood.
By investigating differences of experimental binding energies, such as two-neutron separation
energies (S2n), valuable indications for nuclear-structure studies are provided.
The present thesis contributes to these studies providing new high-precision mass measurements
especially in the heavy-mass region. Here, nuclear theory is heavily challenged
due to the large number of nucleons. The data have been obtained at the Penningtrap
mass spectrometer Isoltrap located at the radioactive-ion-beam facility Isolde at
Cern. For the determination of the masses, the time-of-flight ion-cyclotron-resonance
technique has been applied.
While the new mass data for 122−124Ag continue existing trends in the S2n energies,
the new mass values for 207,208Fr render them more precisely. In the case of the mass
values for 184,186,190,193−195Tl a new interesting odd-even effect has been revealed. The
comparison of the measured mass values with theoretical models furthermore demonstrates
significant problems in reproducing the strength of the pairing correctly. This is
of special interest for the discussion about shape coexistence in the region around the
doubly-magic 208Pb.
