Frankfurt 2006 – wissenschaftliches Programm

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A: Atomphysik

A 7: Wechselwirkung von Materie mit Ionen

A 7.5: Vortrag

Dienstag, 14. März 2006, 15:30–15:45, H7

Radiative Electron Capture to the Continuum Cusp (RECC) and the short-wavelength limit of electron nucleus Bremsstrahlung in inverse kinematics for 90 AMeV U ⁸⁸⁺ + N₂ — •M. Nofal^1,2, S Hagmann^3,2, C. Kozhuharov², T. Stöhlker², X. Wang⁴, A. Gumberidze², U. Spillmann², R. Reuschl², S. Heß², S. Trotsenko², D. Banas², F. Bosch², D. Liesen², D. Jakubassa⁵, M. Steck², P. Beller², K. Beckert², and B. Franczak² — ¹Max Planck Inst. f. Kernphysik, Heidelberg — ²GSI-Darmstadt — ³Inst. f. Kernphysik, Univ. Frankfurt — ⁴Fudan University, Shanghai — ⁵Rechenzentrum LMU-München

We have investigated for 90 AMeV U ⁸⁸⁺ + N₂ coincidences between cusp electrons around v_elec ≈ v_Proj analyzed with the imaging forward electron spectrometer in the ESR - and x-rays detected at 90^∘ with respect to the beam axis. In the coincident x-ray spectra we see nearly exclusively photons from the short wave length limit of electron nucleus Bremsstrahlung, corroborating identification of the coincident electrons as RECC cusp. We found a strong asymmetry of the coincident RECC electron cusp distribution [1] which is skewed towards the high-energy side of the electron spectrum; we compare the RECC cusp with the non-radiative electron capture (ECC) and loss (ELC) cusp peaks in the forward electron spectrum.

[1] D.Jakubassa J.Phys.B36 (2003)1971