Skip to main content
Article thumbnail
Location of Repository

ATOMIC-PHYSICS-10 Electron Capture to Continuum (ECC) in Near-Relativistic Collisions

By M. Nofal, S. Hagmann, Th. Stöhlker, D. Jakubassa-amundsen and Ch. Kozhuharov


In near relativistic collisions of heavy ions and atoms there is a transition region where radiative (RECC) and non radiative (ECC) transfer processes to the projectile appear with comparable cross sections. This is a particularly interesting case for studying the dynamics of these processes as in both cases initial and final states are the same and the only difference is the additional radiative degree of freedom in the RECC channel. Whereas the RECC is uniquely identified by coincidences between r r forward emitted electrons around velectron = v projectile and bremsstrahlung photons, the double differential cross section DDCS for the non radiative transfer ECC U 88+ +N2 →U 88+ + eCusp +{N2 + * } can only be derived indirectly as in a storage ring no coincidence measurement of cusp electrons with projectiles not having undergone a charge exchange in the collision is possible. We have thus measured for 90 AMeV U 88+ +N2 all pertinent channels: coinci-r r dences of electrons around velectron = v projectile with bremsstrahlung photons and charge exchanged projectiles U 89+, U 87+, respectively (see fig.1). In a given number of detected forward emitted electrons the fraction of electrons associated with projectile loss (ELC) and transfer ionization (TI) is completely determined from the coincidences with the charge exchanged projectiles nloss(U 89+) and ncapt(U 87+),respectively, and detected in multi wire proportional counters MWPC behind the first magnet downstream from the target zone. Theoretical angular distributions for electron nucleus bremsstrahlung and the simultaneously measured RECC permit to calculate the total fraction of forward electrons associated with the RECC. After subtracting these channels the relative cross section for non radiative capture to continuum ECC is derived (see fig 2). U 88+ supersonic Jet target Hp Ge x ray detecto

Year: 2010
OAI identifier: oai:CiteSeerX.psu:
Provided by: CiteSeerX
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • (external link)
  • (external link)
  • Suggested articles

    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.