Heavy ion scattering: High energy limits of RBS and ERD

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:199873

Rauhala, E ^[1]

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1. Univ. of Helsinki (Finland)

Elastic scattering of {sup 7}Li ions by oxygen and {sup 12}C, {sup 14}N and {sup 16}O ions by aluminum, silicon, titanium and sulfur have been studied below the Coulomb barrier energies 3-30 MeV in the angular range of 78{degrees} - 170{degrees}. By kinematically reversing the reactions, the recoiling of carbon, nitrogen and oxygen by 40-100 MeV {sup 27}Al, {sup 28}Si, {sup 32S} and {sup 48}Ti ions into recoil angles of 20{degrees}, 25{degrees}, 30{degrees} and 40{degrees} has also been investigated. Excitation functions and angular distributions are presented. Contrary to the case of light H and He ions, the heavy ion scattering cross sections fall off rapidly above the non-Rutherford threshold energy, rendering heavy ion RBS and ERD spectrometry worthless. Both classical and wave mechanical calculations have been attempted for predicting the RBS threshold energies. Simple calculations give moderate accuracy, while the more extensive nuclear potential perturbation approach relies on parameters fitted for the particular experiment. The authors present a general classical semi-empirical model for both direct scattering (RBS) and the kinematically reversed reactions (ERD), accurately reproducing the experimental data. The model is based on parameters fitted from the present scattering experiments and from an extensive literature survey.

• OSTI ID: 199873
• Report Number(s): CONF-941129--
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALUMINIUM 27 TARGET
CARBON 12 REACTIONS
CROSS SECTIONS
ELASTIC SCATTERING
ENERGY DEPENDENCE
LITHIUM 7 REACTIONS
MEV RANGE 01-10
MEV RANGE 10-100
NITROGEN 14 REACTIONS
OXYGEN 16 REACTIONS
OXYGEN 16 TARGET
SILICON 28 TARGET
SULFUR 32 TARGET
TITANIUM 48 TARGET