Method for predicting stopping and straggling mean excitation energies
A method for the rapid and convenient evaluation of the mean excitation energies that appear in excitation-energy moments of the Bethe-Born cross section is described. It consists of an adaptation of a technique introduced by Pekeris and Dalgarno that uses the excitation-energy moments of the dipole-oscillator-strength sums. The approximate procedure proposed here requires only the initial wave function for the target. The average errors in the logarithms of the stopping and straggling mean excitation energies are less than 1% and 2%, respectively, when compared with direct calculations of these quantities for neutral atoms with nuclear charges in the 2--38 range. Certain applications require values for the subshell contributions to the stopping mean excitation energy. The present scheme provides these individual contributions with errors comparable to those observed for the total mean excitation energy.
- Research Organization:
- Sandia National Laboratories, Albuquerque, New Mexico 87185
- OSTI ID:
- 7184350
- Journal Information:
- Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 29:3; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGED PARTICLES
CROSS SECTIONS
DIPOLES
ENERGY LOSSES
ENERGY-LEVEL TRANSITIONS
EXCITATION
FUNCTIONS
LOSSES
MULTIPOLES
OSCILLATOR STRENGTHS
RANGE
STOPPING POWER
TARGETS
WAVE FUNCTIONS