Speaker
Description
In heavy-ion beam experiments, the charge-state distribution of ions after passing through materials is an important quantity for improving the accuracy of beam transmission efficiency and interaction cross-section measurements. In the transmission method for measuring interaction cross sections, precise prediction or measurement of the charge-state distribution is essential to ensure accuracy. We performed systematic measurements of charge-state distributions for heavy ions in the TRIP-S3CAN experiment.
In this study, radioactive isotope beams of nuclei around $^{136}\textrm{Xe}$ were produced using a primary beam of $^{238}\textrm{U}$ at the RIKEN Radioactive Isotope Beam Factory (RIBF). Their charge-state distributions after passing through target materials were measured with the BigRIPS spectrometer and the Zero Degree Spectrometer. In particular, for isotopes with atomic numbers $Z$ = 54–61, the $Z$ dependence of the fractions of H-like and He-like charge states was investigated and compared with predictions from simulation codes such as CHARGE and GLOBAL[1]. Furthermore, we also evaluated the energy dependence of the charge-state distributions.
[1] C. Scheidenberger, Th. Stöhlker, W.E. Meyerhof, H. Geissel, P.H. Mokler, B. Blank, “Charge states of relativistic heavy ions in matter,” Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 142 (1998), pp. 441–462.
