Density dependence of the deexcitation dynamics of kaonic hydrogen and deuterium atoms formed in kaon transmission through gaseous hydrogen and deuterium targets

摘要

The cascade calculations presented have led to a more detailed understanding of the atomic cascade in K(-)x (where x can be either p or d) atoms. The density dependence of the K-series x-ray yields of kaonic hydrogen and deuterium atoms is investigated. It shows that two processes, nuclear absorption and Stark mixing, have an important role in atomic cascades at high-density targets. Gamma(2p)=0.105 +/- 0.002 meV is approximately suggested for the 2p strong interaction width of K(-)p atoms by fitting our results with existing experimental data. In order to obtain the optimum density for measurement of the 1s strong interaction shift and width, we have investigated the stopping power of kaons in the targets together with the x-ray yields of kaonic hydrogen and deuterium. We have predicted the optimum range of the target density phi similar or equal to 0.03-0.06 of liquid hydrogen density (LHD) for K(-)p atoms and phi similar or equal to 0.06-0.2 of LHD for K(-)d atoms in a forthcoming SIDDHARTA experiment.