Study Of The Temperature Dependence On Stopping Power Of Liquid Lithium For Low Energy Deuteron By The D-~6Li Reaction

The accuracy of the stopping power of material for incident particles is becoming more and more important with the rapid development of ion beam analysis techniques. While the stopping power has been studied for more than ninety years, the stopping power in low energy region is still far from ideal and there is relatively large difference between experimental data and theoretical calculation. First, the stopping power in the low energy region is difficult to obtain experimentally, and on the other hand, the interaction mechanism between low energy rays and matters is complex. Therefore, varieties of approximation have to be used in theoretical calculations. Moreover, the stopping power could be affected temperature, phase and barometric pressure of target matter. Therefore, the research of the stopping power in low energy region gets more and more attention.As it is difficult to directly measure the stopping power in low energy region, this work uses the yield of 6Li(d,α)4He nuclear reaction to research the temperature effect on the stopping power of liquid lithium indirectly. This experiment was performed on the low energy accelerator platform in the Department of Electron and Photon Science, Tohuku University. The liquid lithium target at temperatures of 495±13 K, 532±6 K, 576±8 K and 600±4 K were bombarded by the 50-70 keV proton beam. At the same time, the thick target yields of the α particles emitted from the 6Li(d,α)4He reaction were measured.It was found that the α yield at the same incident energy increases significantly as the temperature increases. Several factors which impact the integral equations of thin target were analyzed. The detection angle Δ?labincreases only 0.36% with the increasing temperature and screening potential Us decreased with the increasing temperature which causes the decreased yields, we found that the only reason which leads to the increased yields with the increasing temperature is the increasing target temperature will reduce the stopping power.The yield is calculated theoretically by the integral formula of thin target. The actual stopping power is described based on the stopping power given by SRIM and multiply by the modified temperature coefficient A(T). Through fitting the experimental yield with the theoretical calculation, the temperature coefficient were obtained in four temperature points(495±13 K, 532±6 K, 576±8 K, 600±4 K). They are 0.993±0.006, 0.964±0.003, 0.963±0.003 and 0.937±0.002. In this temperature range, the stopping power reduced by 5.6±0.6%.In this work,not only the temperature effect on the stopping power was found experimentally, but also the stopping power at different temperature were also obtained based on SRIM code. Therefore, this work could be an experimental support for the related research.