@article{oai:repo.qst.go.jp:00045713,
 author = {Kodaira, Satoshi and Yasuda, Nakahiro and Kawashima, Hajime and Kurano, Mieko and Hasebe, Nobuyuki and Doke, Tadayoshi and Ota, Syuya and Tsuruta, Takao and Hasegawa, Hiroaki and Sakai, Satoshi and Nishi, Takao and Ogura, Kouichi and 小平 聡 and 安田 仲宏 and 川嶋 元 and 蔵野 美恵子 and 太田 周也 and 鶴田 隆雄},
 issue = {9-10},
 journal = {Radiation Measurements},
 month = {Oct},
 note = {A new copolymer of CR-39 and DAP resin was developed for the selective detection of ultra heavy nuclei in galactic cosmic rays. The track registration sensitivity for heavy ions with various Z*/b was verified for copolymers mixing CR-39 (BARYOTRAK) with various concentrations of DAP using heavy ion beams at the HIMAC accelerator. In order to realize sufficient polymerization of CR-39/DAP copolymer, the optimum fabricating method was also verified by modifying the concentration of the initiator and temperature–time curing cycle for the copolymerization. CR-39 (BARYOTRAK) used for the base material of copolymerization has many advantages: 1) high uniformity of detector response, 2) extremely clear surface condition after etching, and 3) excellent charge and mass resolutions for heavy ions. The surface condition of the copolymer after etching is remarkably improved by using the BARYOTRAK monomer and its track registration sensitivity is controllable by changing the DAP concentration. However the detection threshold of the CR-39 (BARYOTRAK)/DAP copolymer is not yet satisfactory.},
 pages = {775--778},
 title = {Characteristics of the copolymerized CR-39/DAP track detector for the observation of ultra heavy nuclei in galactic cosmic rays},
 volume = {44},
 year = {2009}
}