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Study of multiple scattering effects in heavy ion RBS

Abstract

Multiple scattering effect is normally neglected in conventional Rutherford Backscattering (RBS) analysis. The backscattered particle yield normally agrees well with the theory based on the single scattering model. However, when heavy incident ions are used such as in heavy ion Rutherford backscattering (HIRBS), or the incident ion energy is reduced, multiple scattering effect starts to play a role in the analysis. In this paper, the experimental data of 6MeV C ions backscattered from a Au target are presented. In measured time of flight spectrum a small step in front of the Au high energy edge is observed. The high energy edge of the step is about 3.4 ns ahead of the Au signal which corresponds to an energy {approx} 300 keV higher than the 135 degree single scattering energy. This value coincides with the double scattering energy of C ion undergoes two consecutive 67.5 degree scattering. Efforts made to investigate the origin of the high energy step observed lead to an Monte Carlo simulation aimed to reproduce the experimental spectrum on computer. As a large angle scattering event is a rare event, two consecutive large angle scattering is extremely hard to reproduce in a random simulation process. Thus, the simulation  More>>
Authors:
Fang, Z; O`Connor, D J [1] 
  1. Newcastle Univ., NSW (Australia). Dept. of Physics
Publication Date:
Dec 31, 1996
Product Type:
Miscellaneous
Report Number:
INIS-AU-0003; CONF-9511295-
Reference Number:
SCA: 665300; PA: AIX-28:058227; EDB-97:123150; SN: 97001842288
Resource Relation:
Conference: 9. Australian conference on nuclear technique of analysis, Newcastle (Australia), 27-29 Nov 1995; Other Information: PBD: [1996]; Related Information: Is Part Of 9th Australian conference on nuclear techniques of analysis. Proceedings; PB: 186 p.
Subject:
66 PHYSICS; GOLD; ION SCATTERING ANALYSIS; MULTIPLE SCATTERING; RUTHERFORD SCATTERING; HEAVY IONS; BACKSCATTERING; COMPUTERIZED SIMULATION; ENERGY SPECTRA; EXPERIMENTAL DATA; MEV RANGE 01-10; MONTE CARLO METHOD; TIME-OF-FLIGHT METHOD
OSTI ID:
520669
Research Organizations:
Australian Inst. of Nuclear Science and Engineering, Lucas Heights, NSW (Australia)
Country of Origin:
Australia
Language:
English
Other Identifying Numbers:
Other: ON: DE97638268; TRN: AU9716154058227
Availability:
INIS; OSTI as DE97638268
Submitting Site:
AUN
Size:
pp. 38-40
Announcement Date:

Citation Formats

Fang, Z, and O`Connor, D J. Study of multiple scattering effects in heavy ion RBS. Australia: N. p., 1996. Web.
Fang, Z, & O`Connor, D J. Study of multiple scattering effects in heavy ion RBS. Australia.
Fang, Z, and O`Connor, D J. 1996. "Study of multiple scattering effects in heavy ion RBS." Australia.
@misc{etde_520669,
title = {Study of multiple scattering effects in heavy ion RBS}
author = {Fang, Z, and O`Connor, D J}
abstractNote = {Multiple scattering effect is normally neglected in conventional Rutherford Backscattering (RBS) analysis. The backscattered particle yield normally agrees well with the theory based on the single scattering model. However, when heavy incident ions are used such as in heavy ion Rutherford backscattering (HIRBS), or the incident ion energy is reduced, multiple scattering effect starts to play a role in the analysis. In this paper, the experimental data of 6MeV C ions backscattered from a Au target are presented. In measured time of flight spectrum a small step in front of the Au high energy edge is observed. The high energy edge of the step is about 3.4 ns ahead of the Au signal which corresponds to an energy {approx} 300 keV higher than the 135 degree single scattering energy. This value coincides with the double scattering energy of C ion undergoes two consecutive 67.5 degree scattering. Efforts made to investigate the origin of the high energy step observed lead to an Monte Carlo simulation aimed to reproduce the experimental spectrum on computer. As a large angle scattering event is a rare event, two consecutive large angle scattering is extremely hard to reproduce in a random simulation process. Thus, the simulation has not found a particle scattering into 130-140 deg with an energy higher than the single scattering energy. Obviously faster algorithms and a better physical model are necessary for a successful simulation. 16 refs., 3 figs.}
place = {Australia}
year = {1996}
month = {Dec}
}