@article{oai:repo.qst.go.jp:00073419,
 author = {K , Imamura, and Y, Matsuo, and W , Kobayashi, and T, Egami, and M, Sanjo, and A , Takamine, and T, Fujita, and D, Tominaga, and Y , Nakamura, and T, Furukawa, and Wakui, Takashi and Y , Ichikawa, and H, Nishibata, and T, Sato, and A , Gladkov, and LC , Tao, and T , Kawaguchi, and Y, Baba, and M , Iijima, and H , Gonda, and Y , Takeuchi, and R, Nakazato, and H , Odashima, and H , Ueno, and Wakui, Takashi},
 issue = {1},
 journal = {APPLIED PHYSICS EXPRESS},
 month = {Dec},
 note = {We report on a new in situ laser spectroscopy technique using superfluid helium and a highly energetic ion beam. In taking advantage of superfluid helium as a host matrix for laser spectroscopy, we were able to develop an extremely low background detection system. The first demonstration using Rb-85(31+) ion beam (66 MeV/nucleon) accelerated at the RIKEN accelerator facility shows improvement of detection limit by two orders of magnitude. A quantitative evaluation of Rb atoms in the observation region enables an analysis of their optical absorption cross-section in superfluid helium from the fluorescence intensity dependence on ion-beam intensity and applied laser power. (C) 2018 The Japan Society of Applied Physics},
 title = {Absolute optical absorption cross-section measurement of Rb atoms injected into superfluid helium using energetic ion beams},
 volume = {12},
 year = {2018}
}