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          Institute: MPI für Kernphysik     Collection: Spectroscopy and Dynamics of Trapped and Stored Ions     Display Documents



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ID: 517083.0, MPI für Kernphysik / Spectroscopy and Dynamics of Trapped and Stored Ions
The construction of Triga-Trap and direct high-precision
Penning trap mass measurements on rare-earth elements and americium
Authors:Ketelaer, Jens
Referees:Blaum, Klaus; Walz, Jochen
Language:English
Date of Approval (YYYY-MM-DD):2010-09-23
Name of University:Johannes Gutenberg-Universität
Place of University:Mainz
Physical Description
(e.g. Total Number of Pages):
142 S. : Ill., graph. Darst.
Audience:Experts Only
Abstract / Description:Nuclear masses are an important quantity to study nuclear structure since they reflect the sum of all nucleonic
interactions. Many experimental possibilities exist to precisely measure masses, out of which the Penning
trap is the tool to reach the highest precision. Moreover, absolute mass measurements can be performed using
carbon, the atomic-mass standard, as a reference. The new double-Penning trap mass spectrometer Triga-Trap has been installed and commissioned within this thesis work, which is the very first experimental setup of this kind located at a nuclear reactor. New technical developments have been carried out such as a reliable non-resonant laser ablation ion source for the production of carbon cluster ions and are still continued, like a non-destructive ion detection technique for single-ion measurements. Neutron-rich fi ssion products will be available by the reactor that are important for nuclear astrophysics, especially the r-process. Prior to the on-line coupling to the reactor, Triga-Trap already performed o -line mass measurements on stable and long-lived isotopes and will continue this program. The main focus within this thesis was on certain rare-earth nuclides in the well-established region of deformation around N ~ 90. Another fi eld of interest are mass measurements on actinoids to test mass models and to provide direct links to the mass standard. Within this thesis, the mass of 241Am could be measured directly for the fi rst time.
Document Type:PhD-Thesis
Affiliations:MPI für Kernphysik/Group of K. Blaum
Full Text:
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Jens Ketelaer - MPIK - Dissertation.pdf  [5,00 Mb]   
 
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