Antiprotons for Nuclear Structure Investigations H. Lenske Institut für Theoretische Physik, U. Giessen

Measuring Neutron Skins on Isotopic Chains (Ni,Sn…): p + A the AIC Proposal P. Kienle, NMB 214 (2004) and Proposal H.L., P. Kienle, Phys.Lett. B647 (2007) 82-87

Antiprotons for Nuclear Structure Agenda:  Antiproton-N and Antiproton-Nucleus Interactions  Nuclear Radii from Absorption Cross Sections  Antiprotons and Neutron-Skins  Screening Effects in Neutron-rich Nuclei  Isospin Tagging by Pion Production  Strangeness Production  Outlook

The antiproton-proton Interaction: LEAR Data

Antiproton-Nucleon Interactions

The History of the longterm relation… …of antiprotons and nuclei: anti-protonic atoms and tails of nuclear densities antiproton-A elastic scattering annihilation and pion production G-parity transformation of scalar and vector self- energies  deep potentials ~ -500 MeV dispersive self-energies from annihilation channels Annihilation and Quark Models Meson & Hadron Dynamics from pp  hh

Consequences of G-Parity in Nuclear Binding

Energy Deposition in a Nucleus (Cascade-Calculations, Clover et al., PRC 26)

The antiproton-Nucleus Interaction Antiproton+A scattering: Free Space pN T-Matrix Nuclear Structure: state-of-the-art HFB p and n Densities optical Potential in Impulse (t  ) Approximation

Antiproton+Nucleus Interactions:Elastic Scattering

pA Scattering: Optical Potential and Absorption Cross Section From The Continuity Equation: Eikonal Approximation:

Antiproton Absorption on 58,78 Ni: The Monopole Annihilation Kernel and the Nuclear Density

Antiproton+A Absorption: Limiting Cases

Probing Nuclear Radii by Antiprotons scaling of  abs ~ energy independent slope convergence of magnitude from proton to neutron skin increasing neutron skins up to 0.6 fm charge radii by e - scattering

Measuring Neutron Skins on Isotopic Chains (Ni,Sn…): p + A Absorption on protons and neutrons H.L., P. Kienle, Phys.Lett. B647 (2007) 82-87

Localization of the Annihilation Process

Spatial Localization of Antiproton Annihilation on a Nucleus: Peripheral Process Cascade Results by Clover et al., PRC 26

Absorption on Protons b=4fm Absorption on Neutrons b=4fm Shielding of Target Protons by the Neutron Skin protons neutrons T lab =700 MeV

Antiproton Annihilation on Ni-Isotopes: Scaling of  abs

Antiproton+N Absorption: Isospin Symmetry

Antiproton+Nucleus Interactions: Isospin Symmetry Enhanced along isotopic chains!

Peripheral Antiproton Annihilation on a Nucleus:

Pion Production:

Differential Coherent Antiproton Annihilation on a Nucleus:

Differential Antiproton Annihilation on a Nucleus: Eikonal Approximation: Quantum Mechanical Amplitude:

LEAR-Data (PS185) on Strangeness Production

DDRH Flavour Dynamics:   Single Particle Energies DDRH Theory: Density Dependent NN and N  Dirac-Brueckner Vertices Nuclear Matter S  = 28 MeV

 and   Strangeness Production on Stable and Exotic Nuclei 40 Ca 56 Ca

Antiprotons as a Probe for Nuclear Structure Antipoton-neutron Interactions in Neutron-rich Nuclei Antiproton Absorption in Neutron Skin Matter: Exclusive Processes: Studies of A  A-1 Reactions Multi-Pion and YY Production Antiproton In-Medium Interactions: Test of G-parity for antiproton-N interactions, Study of dispersive self-energies Summary and Outlook Antiproton Ion Collider (AIC) FAIR

Measuring Neutron Skins on Isotopic Chains (Ni,Sn…): p + A the AIC Proposal P. Kienle, NMB 214 (2004) and Proposal H.L., P. Kienle, Phys.Lett. B647 (2007) 82-87