Fitted empirical reference cross sections for K-shell ionization by alpha particles

Journal Article · Sat May 01 00:00:00 EDT 1993 · Atomic Data and Nuclear Data Tables; (United States)

DOI:https://doi.org/10.1006/adnd.1993.1010· OSTI ID:6074819

Paul, H; Bolik, O ^[1]

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1. Johannes-Kepler-Universitaet Linz (Austria)

On the basis of the authors' collection of experimental x-ray and Auger production cross-section data for H and He ions, a table is presented of best-fitted cross sections for K-shell vacancy production (direct ionization plus electron capture) by [sup 4]He ions on all elements from [sub 6]C to [sub 92]U. Experimental values are first converted (if necessary) to vacancy production cross sections using fluorescence yields with an approximate correction for the effect of multiple ionization. These values are then normalized, i.e., divided, by an improved version (due to Benka et al.) of the ECPSSR theory by Brandt and Lapicki, to which a correction for electron capture by the projectile (following Lapicki and McDaniel) has been added. Since is has been found empirically that the normalized cross sections (which describe the deviation of theory from experiment), at a certain scaled projectile speed, depend only on the ratio of projectile and target atomic numbers, the data for both He and H ions can be used as input. The normalized values are averaged, fitted by a polynomial, and multiplied by theory to produce best reference cross sections. Discrepant data sets are rejected using a statistical criterion which compares the deviations found to the errors stated in the original publications. The error assigned to the cross section consists of a calculated random contribution and an estimated systematic contribution that describes the limitations of the method. A list of the experimental input data (for [sup 1]H, [sup 2]H, [sup 3]He, and [sup 4]He projectiles) and a table showing the consistency or inconsistency of these data are also given. 30 refs., 2 figs., 1 tab.

• OSTI ID: 6074819
• Journal Information: Atomic Data and Nuclear Data Tables; (United States), Vol. 54:1; ISSN 0092-640X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
CROSS SECTIONS
K SHELL
IONIZATION
ALPHA PARTICLES
AUGER ELECTRON SPECTROSCOPY
ELECTRON CAPTURE
HELIUM 4
HELIUM IONS
HYDROGEN IONS
STATISTICAL DATA
X-RAY FLUORESCENCE ANALYSIS
CAPTURE
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CHEMICAL ANALYSIS
DATA
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
EVEN-EVEN NUCLEI
HELIUM ISOTOPES
INFORMATION
IONS
ISOTOPES
LIGHT NUCLEI
NONDESTRUCTIVE ANALYSIS
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
SPECTROSCOPY
STABLE ISOTOPES
X-RAY EMISSION ANALYSIS
663440* - D-
T-
& He-induced Reactions & Scattering- (1992-)