@article{oai:repo.qst.go.jp:00043798,
 author = {Li, Qiang and Kitagawa, Atsushi and Kanai, Tatsuaki and Kanazawa, Mitsutaka and Urakabe, Eriko and Tomitani, Takehiro and Satou, Shinji and Zhang, Wei and 李 強 and 北川 敦志 and 金井 達明 and 金澤 光隆 and 新谷 恵理子 and 富谷 武浩 and 佐藤 眞二 and 張 偉},
 journal = {Nuclear Instruments & Methods in Physics Research Section B},
 month = {},
 note = {Due to the favorable characteristics of heavy-ion beams such as dose localization as well as high relative biological effectiveness, heavy-ion cancer therapy is attracting growing interests all over the world.  The application of beta-delayed particle decay beams like 9C ions in cancer therapy is expected to further improve the treatment efficacy of the modality of heavy-ions.  For the first time 9C beams were produced in the secondary beam line (SBL) of the HIMAC facility with a primary 12C beam of 430 MeV/n.  The production conditions providing a 9C beam with higher production rate and purity were optimized using different thick production targets and degraders.  The results show setting the momentum acceptance to the full value of 5% the production rate is 9.07 x 10^-6^ and the purity is 82.88% for the produced 9C beam under the optimal condition.  Because of the large momentum spread for a secondary beam, the momentum distribution of the produced 9C beam at the optimal condition was measured.  The momentum among the beam had a nearly Gaussian profile with a standard deviation of 26.1 MeV/c/n and the largest component of the momenta appeared around 838.9 MeV/c/n.  In order to form a relatively large uniform irradiation field being apppropriate to further biologicl experiments for the produced 9C beam, the scanning magnets in the irradiation system of the SBL, operating in a wobbling mode, was use.  A uniform irradiation field of 20 mm in diameter could be achieved with homogeneity of 93.3%.  The work presented in this paper provides a substantial basis for the further studies with 9C beams for the therapeutic purpose.},
 pages = {270--284},
 title = {Therapeutic purpose 9C beams produced in the secondary beam line at HIMAC},
 volume = {222},
 year = {2004}
}