Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 46: Structure and Dynamics of Nuclei 10
HK 46.3: Vortrag
Mittwoch, 25. März 2015, 15:00–15:15, T/SR14
Low-lying structure of 30Na and the sd-pf shell gap — •Marina Petri — Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
Light neutron-rich nuclei around N=20 show properties that are not in line with their expected magicity but rather imply a deformed shape. These nuclei lie in the so-called “Island of Inversion” where the deformation is due to neutron cross-shell excitations, namely ν(sd)−2(fp)2 configurations, dominating their ground and low-lying states. Recently, there has been much interest in studying the transition towards this region to determine the evolution of the N=20 shell gap and to provide a stringent test for nuclear models.
In this work the odd-odd nucleus 30Na is studied via 1p, 1p1n and 1n knockout reactions at the NSCL using 31Mg, 32Mg and 31Na radioactive beams, respectively. Combining high-resolution γ-ray spectroscopy with the selectivity of the various reaction mechanisms we are able to distinguish multiple configurations. Negative parity states in 30Na are identified for the first time, providing an important measure of the excitation of the 1p1h configuration. Gamma rays de-exciting both K=1 and K=2 2p2h structures have been observed, while the rotational band built on the ground state has been established. These new results provide a stringent test for the state-of-the-art effective interactions used in this region and constrain the sd-pf shell gap.