Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Structure and Dynamics of Nuclei 10

HK 46.1: Vortrag

Mittwoch, 25. März 2015, 14:30–14:45, T/SR14

Isotope Shifts and Charge Radii in Zn around N=50 — •Laura Grob for the COLLAPS IS519 collaboration — CERN, Geneva, Switzerland — Institut für Kernphysik, TU Darmstadt

For neutron-rich isotopes far from stability shell closures have been observed at neutron numbers than differ from the well-established magic ones. The weakening or disappearance of the magic number N=50 has been predicted for isotopes around the Z=28 shell closure and might be caused by tensor interactions. Laser spectroscopic studies of Cu (Z=29) and Ga (Z=31) around the N=50 shell closure have already provided information on level migration due to tensor effects. In both isotopic chains an inversion of the proton level occurs, detected by spin changes. To study the Z-dependence of this level migration and its link to the tensor interaction, collinear laser spectroscopy measurements on neutron-rich Zn were performed at COLLAPS/ISOLDE. The optical spectra comprise important information on the ground state properties of the measured isotopes such as spins, charge radii, magnetic and quadrupole moments. For Zn there are four stable isotopes for which charge radii are known from electron scattering experiments. This will allow us to calibrate the charge radius information in this region. This talk will briefly explain the experimental technique and setup, and will present the first results of isotope shifts and charge radii for the even Zn isotopes up to N=50.