Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Structure and Dynamics of Nuclei VI

HK 41.4: Vortrag

Donnerstag, 30. März 2017, 15:00–15:15, F 2

High-resolution laser spectroscopy on neutron-rich nickel isotopes — •Simon Kaufmann for the COLLAPS-IS568 collaboration — Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany

Laser spectroscopy of nickel isotopes was so far only performed for the stable isotopes 58,60,61,62,64Ni. Studies of the nuclear charge radii and nuclear moments in the neighboring isotopic chains of Cu (Z=29) and Ga (Z=31) showed a weak effect of a possible N=40 sub-shell closure in copper but nothing convincing in the Ga isotopes [1, 2]. The aim of this experiment was to complement the picture by studying the neutron-rich Ni isotopes with the magic proton number Z = 28 in order to understand the Z dependency of this behavior. The experiment on the isotopes 58 − 68, 70Ni was carried out at the collinear laser spectroscopy (CLS) beamline COLLAPS at ISOLDE/CERN probing the 3d94s 3D3 → 3d94p  3P2 transition at 352.454 nm in atomic Ni. We used a bunched beam structure with bunch lenghts in the order of some µs produced by the radio frequency quadrupole cooler and buncher ISCOOL. During this measurement campaign a new time-resolved data acquisition system was successfully tested in parallel to the conventional data acquisition system. The time-resolved measurement allowed us to detect irregularities within the energy structure of the ion bunches and minimize those effects by optimizing ISCOOL.

[1] T. J. Procter et al., Phys. Rev. C 6, 034329 (2012)

[2] M. L. Bissell et al., Phys. Rev. C 93, 064318 (2016)

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