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HK: Fachverband Hadronen und Kerne

HK 67: Poster Session

HK 67.55: Poster

Donnerstag, 19. März 2009, 14:00–16:00, Audi-Max

Nuclear structure research with thePenningtrap mass spectrometer ISOLTRAP at CERN — •Dennis Neidherr — Johannes Gutenberg-Universität Mainz, Germany

At the double-Penning-trap mass spectrometer ISOLTRAP [1] at ISOLDE/CERN the cyclotron frequency of short-lived radionuclides is measured in order to determine their mass with a relative uncertainty in the order of 10⁻⁸ and below. This ground state property plays an important role in many fields of modern physics from nuclear-structure research to nuclear astrophysics and tests of the weak interaction of the Standard Model. An example for the first one is the evolution of the nuclear shape as a function of the number of neutrons and protons. In 2008 the masses of ^223−229Rn and ^143−146Xe were measured for the first time directly, whereas ²²⁹Rn was even discovered by our Penning trap based experiment. With this mass values one can study the proton-neutron interaction and therefore get information about the nuclear structure like collectivity, the onset of deformation or the geometrical shapes in atomic nuclei [2]. The experimental results as well as the impact on the theoretical models will be presented.

[1] M. Mukherjee et al., Eur. Phys. J. A 35, 1-29 (2008).

[2] R.B. Cakirli et al., Phys. Rev. Lett. 94, 092501 (2005).