Charge dependence of the energy loss of heavy ions in matter

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6320202

Anthony, J M

Although the energy loss of charged particles in matter has long been thought to be proportional to the square of the projectile charge, recent measurements with light ions suggest that higher order charge dependent corrections are necessary in order to describe experimental results. In order to (1) explore the importance of these higher order terms in heavy ion stopping powers, and (2) understand the effective charge of these heavy ions during penetration, we have made a study of the energy loss of heavy ions in both thick and thin targets. The thick target measurements, which involve the energy loss of Si, Ni and Au ions in thick (5 to 10 mg/cm/sup 2/) Cu, Ag and Pb targets at energies E < 2.5 MeV/amu, are not well described by current standard tabulations. This suggests errors in the Z/sub 1//sup 2/ stopping power expression used to produce these tabulations. Independent dE/dx measurements with thin targets, in which the stopping powers of C, Si, Cl, Ti, Fe, Ni, Ge, Br, Nb and I ions in C, Al, Cu, Ag and Au targets at energies near the peak in the stopping power vs. energy curve have been measured, confirm the thick-target results. We have parameterized both the higher order corrections and the effective charge and fit them to our data. The results of these calculations show that the higher order corrections are indeed important in describing heavy ion energy loss, and the best fits to our data are provided by the terms of Lindhard.

• Research Organization: Yale Univ., New Haven, CT (USA)
• OSTI ID: 6320202
• Country of Publication: United States
• Language: English

Related Subjects

654001* -- Radiation &amp; Shielding Physics-- Radiation Physics
Shielding Calculations &amp; Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM
BROMINE IONS
CARBON
CARBON IONS
CHARGED PARTICLES
CHARGED-PARTICLE TRANSPORT
CHLORINE IONS
COPPER
CORRECTIONS
DATA
ELECTRIC CHARGES
ELEMENTS
ENERGY LOSSES
EXPERIMENTAL DATA
GERMANIUM IONS
GOLD IONS
HEAVY IONS
INFORMATION
IODINE IONS
IONS
IRON IONS
LEAD
LOSSES
METALS
NICKEL IONS
NIOBIUM IONS
NONMETALS
NUMERICAL DATA
RADIATION TRANSPORT
SILICON IONS
SILVER
TITANIUM IONS
TRANSITION ELEMENTS