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Antiprotons for Nuclear Structure Investigations

Antiprotons for Nuclear Structure Investigations. H. Lenske Institut für Theoretische Physik, U. Giessen. Measuring Neutron Skins on Isotopic Chains (Ni,Sn…): p + A Absorption@FAIR: the AIC Proposal.

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Antiprotons for Nuclear Structure Investigations

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

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

  3. Antiprotons for Nuclear Structure Investigations @FAIR 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

  4. The antiproton-proton Interaction: LEAR Data

  5. Antiproton-Nucleon Interactions

  6. 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

  7. Consequences of G-Parity in Nuclear Binding

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

  9. 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 inImpulse (t) Approximation

  10. Antiproton+Nucleus Interactions:Elastic Scattering

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

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

  13. Antiproton+A Absorption: Limiting Cases

  14. Probing Nuclear Radii by Antiprotons • from proton to neutron skin • increasing <r2> • neutron skins up to 0.6 fm • charge radii by e- scattering • scaling of sabs ~ <r2> • energy independent slope • convergence of magnitude

  15. 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

  16. Localization of the Annihilation Process

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

  18. Shielding of Target Protons by the Neutron Skin Tlab=700 MeV protons Absorption on Protons b=4fm neutrons Absorption on Neutrons b=4fm

  19. Antiproton Annihilation on Ni-Isotopes: Scaling of sabs

  20. Antiproton+N Absorption: Isospin Symmetry

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

  22. Peripheral Antiproton Annihilation on a Nucleus:

  23. Pion Production:

  24. Differential Coherent Antiproton Annihilation on a Nucleus:

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

  26. LEAR-Data (PS185) on Strangeness Production

  27. DDRH Flavour Dynamics:LSingle Particle Energies Nuclear Matter SL = 28 MeV DDRH Theory: Density Dependent NN and NL Dirac-Brueckner Vertices

  28. L and S0 Strangeness Production on Stable and Exotic Nuclei 40Ca 56Ca

  29. Summary and Outlook • 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 Antiproton Ion Collider (AIC) Collaboration @ FAIR

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

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