^18O(p,α) Nuclear Depth Profiling
Abstract
We are designing and developing a setup to be used for nuclear depth profiling of ^18O distribution within a SiO2 target using the ^18O(p,α) reaction. The technique can be applied to any thin layer of oxide. Our device fits within an existing accelerator setup at CSM. It consists of a target mount, detector mount, foil shield, and cooling system. The components can be mounted in a variety of positions. The setup was designed to minimize alpha particle energy loss in the target and energy peak width in order to maximize depth resolution. We determined that 21.5^rc is our optimum detection angle. Using computer simulations we calculated the Γ_ FWHM for monoenergetic alpha particles as they pass through the target material and the foil. We measured the instrumental energy resolution of the detector and found that it decreases exponentially with a decrease in temperature. We determined that 0^rc C would provide a sufficient energy resolution. We decided to use 1 μm thick Ni foil to stop 200 keV backscattered protons after running simulations with a variety of materials. The setup is currently being installed and tested.
- Publication:
-
APS Four Corners Section Meeting Abstracts
- Pub Date:
- October 2002
- Bibcode:
- 2002APS..4CF.1A017J