Target Normal Sheath Acceleration as a Technique for Measuring Nuclear Cross-Sections

Thumbnail Image
Martin, Andrew
Yuly, Mark
Journal Title
Journal ISSN
Volume Title
Houghton University
A Multi-Terawatt Laser (MTW) experiment was performed at the Laboratory for Laser Energetics (LLE) to test the feasibility of using Target Normal Sheath Acceleration (TNSA) to measure 0.1-10 MeV light-ion cross sections, especially those involving tritium. In this initial experiment using deuterium, laser pulses (∼22 J, 7 ps) struck a 0.25 mm2 deuterated polyethylene (CD2) target, ejecting TNSA deuterons that hit a ~2 μm thick natural Li target film on a 25 µm thick stainless-steel substrate, causing the 7Li(d,p)8Li reaction. The Short-Lived Isotope Counting System (SLICS), consisting of the phoswich scintillator, light guide, and photomultiplier, was placed immediately behind the Li target, and a high-speed CAEN Digitizer was used to count the 840 ms half-life beta decay of 8Li, starting a few milliseconds after the laser shot. The phoswich detector consisted of a fast thin and slow thick scintillator sandwiched together to allow incident particles to be identified by their different rates of energy loss. Incident deuteron energy spectra were measured using time-of-flight (TOF) to a small scintillator in front of the Li target and, for comparison, with a Thompson parabola spectrometer.
XLII Annual Rochester Symposium for Physics Students, University of Rochester, April 20, 2024
Student Projects
Authors retain the copyright for all content posted in this repository. This material may not be published, reproduced, broadcast, rewritten, or redistributed beyond the Houghton University community without permission except in accordance with fair use doctrine.