@article{oai:repo.qst.go.jp:00046207,
 author = {Ota, Syuya and Yasuda, Nakahiro and Sihver, Lembit and Kodaira, Satoshi and Naka, Shuichiro and Ideguchi, Yusuke and Hasebe, Nobuyuki and 太田 周也 and 安田 仲宏 and 小平 聡 and 仲 秀一郎 and 井手口 悠介},
 issue = {4},
 journal = {Astrophysics and Space Sciences Transactions},
 month = {Nov},
 note = {Charge identification of trans-iron nuclei (nuclear charge: Z>=30) using CR-39 plastic nuclear track detector (PNTD) is essential as a part of an effort to our future measurements of the projectile charge changing cross sections for galactic cosmic ray nuclei, but extremely hard. Therefore, an improvement method of the charge resolution (sZ) for 350 MeV/n Ge in CR-39 PNTD using the trajectory tracing
technique with averaging the signals of nuclear tracks for each ion was studied. Eight sheets of CR-39 PNTDs were aligned and exposed to Ge beam behind a graphite target to produce projectile fragments. Average of the nuclear track data was taken over 16 detector surfaces for each ion, then the sZ of Ge was successfully improved from 0.31 charge unit on single surface to 0.15 charge unit in rms, which is
good enough for making the precise cross section measurements and no other experiments using CR-39 PNTDs or the other passive detectors have achieved such a good sZ for the trans-iron nuclei with Z/beta <50 (beta: relativistic velocity).
This method will be very important for our future cross section measurements toward the study of galactic cosmic ray origin.},
 pages = {495--500},
 title = {Improvement of charge resolution for trans-iron nuclei (Z >=30) in CR-39 plastic nuclear track detectors using trajectory tracing technique},
 volume = {7},
 year = {2011}
}