Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 5: Structure and Dynamics of Nuclei I

HK 5.4: Talk

Monday, March 14, 2016, 15:00–15:15, S1/01 A03

Inelastic scattering of neutron-rich ^72,74Ni off a proton target — •Martha Liliana Cortés for the SEASTAR collaboration — Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany — GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany

One of the fundamental pillars of nuclear structure is the concept of shell structure governed by a mean-field with a strong spin-orbit interaction. Nevertheless, it has been observed that shell structure changes as one moves away from the stability line. Particularly important to study shell-evolution are nuclei around doubly-closed shells, for example around ⁷⁸Ni. Inelastic proton scattering of ^72,74Ni was performed at RIKEN as part of the first SEASTAR campaign. Isotopes were produced by the in-flight fission of ²³⁸U ions on a 3 mm thick Be target. After production, neutron-rich isotopes were selected and identified on an event-by-event basis using the BigRIPS separator. Selected isotopes were focused onto the MINOS liquid hydrogen target and γ-rays from (p,p′) reactions were detected with the DALI2 array. Outgoing particles were identified using the ZeroDegree spectrometer. Transitions from the first 2⁺ and 4⁺ states in both isotopes were identified in Doppler corrected γ-ray energy spectra. Using detailed Geant4 simulations, exclusive cross sections for inelastic proton scattering were obtained and the corresponding deformation lengths were derived. The ongoing data analysis will be presented and a discussion on the implications of the measured cross sections on the independent motion of protons and neutrons on neutron-rich Ni isotopes will be shown.