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A: Atomphysik

A 2: Ion Scattering I

A 2.6: Vortrag

Montag, 2. April 2001, 17:00–17:15, H1028

A Collective ECC Cusp in Strong Field Heavy Ion Collisions — •Siegbert Hagmann^1,2 and Imad Ali¹ — ¹J.R.Macdonald Lab., Dept. of Physics, Kansas State Univ. — ²GSI- Darmstadt

We have measured doubly differential cross sections for continuum electron emission induced by I(23+,26+) and F(9+) projectiles incident on Ar targets for well defined emission multiplicities. We find that the angular distribution of primordial electrons emitted for multiple target ionization exhibits a strong enhancement of emission in a narrow forward cone when compard to single target ionization; the angular width of the distribution is condensing with increasing perturbation strength and emission multiplicity inta a No-dqdropNo-dq in momentum space around the ECC Cusp.This is interpreted as evidence for a collective many-electron process in the formation of the ECC Cusp. Support by DOE,Div. of Chem Sciences is acknowledged.