Welcome to the Group Aumann

Welcome to the group of Prof. Aumann

Experimental nuclear physics with exotic ion beams

We develop and realize experiments probing properties of nuclei, in particular properties of short-lived “exotic” nuclei. Aim of these experiments is the understanding of the structure and the reactions of exotic nuclei. Such exotic nuclei exhibit a large neutron-to-proton asymmetry, in contrast to stable nuclei. Besides the fundamental interest of understanding nuclear properties and test nuclear theories, short-lived nuclei are produced in the cosmos and play a central role in the energy production of stars and the synthesis of the elements in the universe. Properties and reactions of neutron-rich nuclei also provide a path towards understanding neutron-rich nuclear matter as found in neutron stars. Our research in that area is based on experiments we perform at the R3B setup at GSI and FAIR, and the SAMURAI experiment at the RIBF in RIKEN (Japan). Complementary investigations with stable nuclei we perform at the photon-tagging facility NEPTUN at the S-DALINAC in the institute for nuclear physics, as well as at the photon-facility NewSUBARU in Japan, at the RCNP in Osaka, and at the JINR in Dubna (Russia). We provide a major contribution towards the development and construction of the R3B experiment at FAIR. R3B is the only experiment worldwide which is capable for kinematically complete measurements of reactions up to relativistic energies of 1 GeV/nucleon even for heavy nuclei and with very good resolution.

Ongoing projects and experiments

  • Collective excitations, dipole response of nuclei
    • Electromagnetic excitation of neutron-rich Sn-isotopes (R3B at GSI)
    • Determination of the dipole-strength function for Z=50 and N=82 nuclei using quasi-mono-energetic photons (NEPTUN at IKP)
    • Excitation of low-lying dipole modes in 132Sn in α-scattering in inverse kinematics (RIKEN, Japan)
    • Measurement of (γ,xn) cross sections with real photons (NewSubaru, Japan)
  • Equation of State of neutron-rich nuclear matter
    • Measurement of the dipole-polarizability of neutron-rich nuclei (R3B at GSI)
    • Determination of the neutron-skin thickness of neutron-rich nuclei from the measurement of neutron-removal cross sections (R3B at GSI)
    • Constraining the density dependence of the symmetry energy from nuclear observables
  • Structure of exotic nuclei and nucleon-nucleon correlations
    • Quasi-free scattering with exotic ion beams (R3B bei GSI)
    • Short-range nucleon-nucleon correlations (JINR Dubna)
    • Resonances in the continuum of neutron-rich calcium isotopes (SAMURAI)
    • (p,p α) Reaktionen an Sn Isotopen (RCNP, Osaka)
  • Unbound nuclei beyond the neutron drip-line (R3B)
    • Search for the tentra-neutron (SAMURAI am RIKEN, Tokyo)
    • Search for 28O (SAMURAI)
    • Unbound fluorine isotopes (SAMURAI)
    • Determination of the un-scattering length
  • Breakup reactions of halo nuclei (R3B and SAMURAI)
    • Neutron-neutron correlations in 6He (SAMURAI)
    • Coulomb-breakup of 8He (SAMURAI)
    • Giant dipole resonance in 6He (R3B)
    • Two-Proton Halo nucleus 17Ne (R3B)
  • Exotic decays: two-photon nuclear transitions (double γ-decay)
  • Nuclear astrophysics (IKP und R3B)
  • Development of detectors and readout electronics (IKP und R3B)
  • Development of a high-resolution spectrometer for R3B
  • Development of data-acquisition systems for R3B and NuSTAR
  • Development of simulation- and analysis-software

We are looking for candidates for research projects

These project will be carried out in the frame work of a

  • Mini-research project
  • Bachelor project
  • Master project
  • Doktoral project

If you are interested to work in our group please contact us.