@article{oai:repo.qst.go.jp:00045570,
 author = {Masuda, Kimiaki and Nishikido, Fumihiko and Shibamura, Eido and Kikuchi, Jun and Doke, Tadayoshi and Murakami, Takeshi and 増田 公明 and 錦戸 文彦 and 菊池 順 and 道家 忠義 and 村上 健},
 issue = {3},
 journal = {Nuclear Instruments & Methods in Physics Research Section A},
 month = {Nov},
 note = {Liquid argon (LAr) has suitable properties for use as a particle-detector medium, however, its response to heavy ions is not linear, because of the non-perfect collection of charge produced by the incident ions due to the strong recombination between the liberated electrons and argon ions. We were able to improve the linearity of the response by doping photoionization materials, such as allene (C3H4), to LAr. Using allene-doped LAr, we made some experiments of the heavy ion calorimeters for the mass identification of relativistic iron ions, but this approach was unsuccessful. We therefore investigated the cause of the failure using relativistic heavy ions of neon, argon and iron. The energy resolutions obtained experimentally were of the order of several percent at the full width at half maximum (FWHM) for neon to iron ions passing through a LAr gap of 10 mm. These values were 2 or 3 times worse than those predicted theoretically, and the poor energy resolution led to insufficient mass resolution. Here, we describe methods for measuring fluctuation in energy-loss signals in LAr, and discuss the factors determining the resolution.},
 pages = {487--497},
 title = {Fluctuation in energy-loss measurements in allene-doped liquid argon for heavy ions},
 volume = {570},
 year = {2006}
}