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Charge-changing energy loss, higher-order Z/sub 1/ dependence, and pre-equilibrium behavior in the stopping power for energetic ions in solids

Journal Article · · Phys. Rev. A; (United States)
; ; ; ;
Relative stopping cross sections are measured for 3-MeV/u He, Li, and C ions in 2--26-..mu..g/cm/sup 2/ C foils. The observed stopping cross sections for the fully stripped He and Li ions scale essentially as Z/sub 1//sup 2/, in agreement with standard theory on higher-order Z/sub 1/-dependent effects applied to C targets. We observe nonequilibrium charge-state effects in the energy loss of C ions. Postfoil charge-state selection is used to measure the fixed-charge stopping cross sections for the fully stripped and one-electron C ions, and to extract the energy lost in the charge-change cycle C/sup 6 +/arrow-right-leftC /sup 5 +/ with the aid of a two-component charge-state model. The results show that charge-changing energy loss forms a significant part of the total stopping for 3-MeV/u C ions, and a significant higher-order Z/sub 1/-dependent effect is seen in the stopping cross section for C/sup 6 +/ ions. The standard interpretation in terms of the Bloch term and polarization theory is discussed in the light of these observations.
Research Organization:
Nuclear Physics Division, Atomic Energy Research Establishment (Harwell), Didcot, Oxon OX11 0RA, United Kingdom
OSTI ID:
6257183
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 30:4; ISSN PLRAA
Country of Publication:
United States
Language:
English

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Related Subjects

654001* -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ATOMIC NUMBER
CARBON
CARBON IONS
CHARGE STATE
CHARGED PARTICLES
CHARGED-PARTICLE TRANSPORT
ELEMENTS
ENERGY DEPENDENCE
ENERGY LOSSES
ENERGY RANGE
FOILS
HELIUM IONS
IONS
LITHIUM IONS
LOSSES
MEV RANGE
MEV RANGE 01-10
NONMETALS
RADIATION TRANSPORT
SCALING LAWS
STOPPING POWER