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Precision mass measurements for studies of nucleosynthesis via the rapid neutron-capture process : penning-trap mass measurements of neutron-rich cadmium and caesium isotopes

Atanasov, Dinko

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Abstract

Although the theory for the rapid neutron-capture process (r-process) was developed more than 55 years ago, the astrophysical site is still under a debate. Theoretical studies predict that the r-process path proceeds through very neutron-rich nuclei with very asymmetric proton-to-neutron ratios. Knowledge about the properties of neutron-rich isotopes found in similar regions of the nuclear chart and furthermore suitable for r-process studies is still little or even not existing. The basic nuclear properties such as binding energies, half-lives, neutron-induced or neutron-capture reaction cross-sections, play an important role in theoretical simulations and can vary or even drastically alternate results of these studies. Therefore, a considerable effort was put forward to access neutron-rich isotopes at radioactive ion-beam facilities like ISOLDE at CERN. The goal of this PhD thesis is to describe the experimental work done for the precision mass measurements of neutron-rich cadmium (129−131 Cd) and caesium (132,146−148 Cs) isotopes. Measurements were done at the on-line radioactive ion-beam facility ISOLDE by using the four-trap mass spectrometer ISOLTRAP. The cadmium isotopes are key nuclides for the synthesis of stable isotopes around the mass peak A = 130 in the Solar System abundance.

Item Type: Dissertation
Supervisor: Blaum, Prof. Dr. Klaus
Place of Publication: Heidelberg, Germany
Date of thesis defense: 6 July 2016
Date Deposited: 14 Jul 2016 07:47
Date: 2016
Faculties / Institutes: Service facilities > Max-Planck-Institute allgemein > MPI for Nuclear Physics
Subjects: 520 Astronomy and allied sciences
530 Physics
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