Speaker
Description
One modern approach to unravelling the complex nuclear many body problem has been to track the evolution of nuclear properties in systems ever closer to the proton or neutron drip-line. Binding energies are among the first observables reaching yet uncharted regions of the nuclear chart and their trends are sensitive to a wide range of nuclear-structure phenomena. As such, they provide invaluable inputs to virtually all nuclear models.
In this contribution, results from two mass measurement campaigns performed with the ISOLTRAP high-precision mass spectrometer [1-2] located at ISOLDE/CERN will be presented. The first such campaign was dedicated to the study of the N=28 shell closure in the argon isotopic south of the doubly-magic $^{48}$Ca. The experimental binding energy trends obtained from the precisely determined masses of $^{46-48}$Ar will be compared to predictions from state-of-the-art ab-initio calculations.
Another recent experiment was dedicated to the study of neutron-deficient indium isotopes in the vicinity of the doubly-magic $^{100}$Sn. This campaign performed at the extreme of the nuclear landscape was successful in measuring $^{99-101}$In. Thanks to the recently commissioned Phase-Imaging Ion-Cyclotron-Resonance technique [3], the mass of a long lived isomeric state in $^{101}$In could also be determined. Implications of the newly measured masses for the Z =N=50 shell closure in close proximity with the proton drip-line as well as for the astrophysical rp-process will be highlighted.
REFERENCES
[1] Mukherjee et al., Eur. Phys. J. A 35, 1-29 (2008).
[2] R. Wolf, F. Wienholtz et al., Int. J. Mass. Spectrom. 349-350, 123-133 (2013).
[3] S. Eliseev et al., Phys. Rev. Lett. 110, 082501 (2013).
