Stripping cross-sections

10.04 Good Morning.

10.05 Cladio deConti is now talking about Pauli Blocking and in-Medium Effects in Nucleon Knockout Reactions.

10.07 I think I need a new pair of glasses to see the introduction.

10.08 Focusing on symmetric nuclear matter, he's studying how the medium modifies nucleon knowckout reaction cross-sections. Such reactions are used to study single particle structure in nuclei.

10.09 It appears (correct me if I'm wrong) that several methods are used - Pauli blocking, Brueckner, and a Hartree-Fock (phenomenological) treatment. Brueckner presumably includes Pauli blocking.

10.10 Approximation: free NN cross-section is isotropic.

10.11 A simple parameterization of the cross-section is shown (I think for the Brueckner treatment). I think simple is a relative term.

10.12 The stripping cross-section is displayed. I had something else in mind other than what is actually shown.

10.13 I'm still thinking about stripping cross-sections.

10.14 So the initial state is before the clothes come off? And the final state....?

10.14 + 30secs And Pauli blocking is something to do with a large Italian bouncer throwing an over-enthusiastic customer out?

10.15 Results! pn cross-sections are displayed. The cross-sections from including Pauli-blocking, and from Brueckner theory, both appear to agree well at low scattering energies, but Brueckner diverges at high energies. They both are lower than the free cross-section at low energies. The phenomenological treatment is close to the free cross-section - so it doesn't include Pauli-blocking?

10.22 The results are applied to some reactions. I picked the wrong talk to sit right at the back of the room.

10.23 Results for stripping diffraction dissociation. Sounds like something you'd find in a David Lynch film.

10.25 My mistake - stripping, diffraction, and dissocation are three seperate processes.

10.27 Conclusions. My eyes hurt.

10.28 Medium modifications are more pronounced in halo nuclei than more bound nuclei.

10.29 Stripping follows nucleon-nucleon cross-sections from model to model.

10.30 Discussion follows about whether the Brueckner's high energy behavior is an artifact or physical. I don't catch the conclusion.

10.33 Questions are certainly lively! Must be all the talk of stripping.

10.35 And we're done. Coffee and a wet towel over the eyes are now in order.