Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Struktur und Dynamik von Kernen

HK 25.8: Talk

Tuesday, March 18, 2014, 18:45–19:00, HZ 5

Ground-state deformation of Cs isotopes — •Dinko Atanasov for the ISOLTRAP collaboration — Max Planck Institute for Nuclear Physics, Heidelberg, Germany

We have performed precision mass measurements of several Cs (Z=55) isotopes using a four-trap mass spectrometer ISOLTRAP, situated at ISOLDE/CERN. The experimental setup consists of an RFQ buncher and cooler, a multi-reflection time-of-flight mass separator and two Penning traps. This scheme allows routinely performing precision mass measurements on short-lived nuclides with a relative mass uncertainty of typically 1E-8. The mass of the neutron-rich ¹⁴⁸Cs nuclide was measured for the first time. In addition, the masses of ^132,147Cs isotopes were re-measured and found to deviate from the latest atomic-mass evaluation (AME2012). Nuclides found in transitional regions between spherical and deformed nuclear shapes are of particular importance for developing theoretical models. One such example of odd-Z mid-shell nuclei are neutron-rich Cs isotopes. The isotope ¹⁴⁸Cs is located in a region of the nuclear chart where the emergence of complex intrinsic shapes are expected such as a negative value for the hexadecapole deformation parameter of nuclear ground-state. For the interpretation of the data we investigated the systematics of ground-state properties such as charge radii or two-neutron separation energies and made an extensive comparison to theoretical predictions. Details of the measurements as well as the new results will be presented.