Dynamics of formation of K-hole fractions of sulfur projectiles inside a carbon foil

Journal Article · Tue Jun 01 04:00:00 EDT 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.69.062705· OSTI ID:20643759

Braziewicz, J; Majewska, U ^[1]; Slabkowska, K; Polasik, M ^[2]; Fijal, I; Jaskola, M; Korman, A; Czarnacki, W ^[3]; Chojnacki, S ^[4]; Kretschmer, W ^[5]

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1. Institute of Physics, Swietokrzyska Academy in Kielce, 25-406 Kielce (Poland)
2. Faculty of Chemistry, Nicholas Copernicus University, 87-100 Torun (Poland)
3. Andrzej Soltan Institute for Nuclear Studies, 05-400 Otwock-Swierk (Poland)
4. Heavy Ion Laboratory, Warsaw University, 02-097 Warsaw (Poland)
5. Physikalisches Institut, Universitaet Erlangen-Nuernberg, D-91058 Erlangen (Germany)

The K{alpha} and K{beta} satellite and hypersatellite x-ray lines emitted by highly ionized sulfur projectiles passing with energies from 65 MeV up to 122 MeV through carbon foils of thickness of 15-210 {mu}g cm{sup -2} have been recorded using a Si(Li) detector. The additional hypersatellite Ky{sup h} peak proves that for such high energies of the sulfur ions very high subshells (4p and 5p) could be occupied. In order to study the dynamics of formation of K-shell vacancy fractions of sulfur projectiles passing through a carbon foil the dependence of sulfur K x-ray production cross sections on foil thickness has been examined separately for each recorded line using the three component model. For each projectile energy the values of K-shell hole production cross sections and K-shell electron capture cross sections (both common for all recorded x-ray lines in the case of each projectile energy) have been fitted, as well as the specific values (for each recorded x-ray line) of K-shell hole filling cross sections, which are directly connected with average lifetimes of appropriate states of sulfur ions. The obtained ''experimental'' values of K-shell vacancy production cross sections are much higher than the theoretical predictions. This suggests that apart from the ionization process the excitation from K shell into higher shells is responsible for a production of K-shell vacancies, which has been confirmed by recent classical trajectory Monte Carlo calculations.

• OSTI ID: 20643759
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 69; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CARBON
CROSS SECTIONS
ELECTRON CAPTURE
EMISSION SPECTRA
EXCITATION
FOILS
HOLES
INNER-SHELL IONIZATION
ION-ATOM COLLISIONS
K SHELL
LI-DRIFTED SI DETECTORS
LIFETIME
MEV RANGE
MONTE CARLO METHOD
PHOTON EMISSION
SULFUR
SULFUR IONS
VACANCIES
X RADIATION
X-RAY SPECTRA