Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 68(8): 529-537 (2019)

特集Special Issues

6.2.4 6 MeV/u重イオン衝突による気体分子の電離過程6.2.4 Ionization of Gaseous Molecules by 6 MeV/u Heavy Ion Impact

1神奈川工科大学工学部Faculty of Engineering, Kanagawa Institute of Technology ◇ 243–0292 神奈川県厚木市下荻野1030 ◇ 1030 Shimo-ogino, Atsugi, Kanagawa 243–0292, Japan

2東京工業大学放射線総合センターRadioisotope Research Center, Tokyo Institute of Technology ◇ 226–8502横浜市緑区長津田町4259 ◇ 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa 226–8502, Japan

3群馬県立県民健康科学大学診療放射線学部School of Radiological Technology, Gunma Prefectural College of Health Sciences ◇ 371–0052群馬県前橋市上沖町323–1 ◇ 323–1 Kamioki-machi, Maebashi, Gunma 371–0052, Japan

4量子科学技術研究開発機構放射線医学総合研究所研究企画室Department of Accelerator and Medical Physics, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology ◇ 263–8555千葉市稲毛区穴川4–9–1 ◇ 4–9–1 Anagawa, Inage-ku, Chiba, Chiba 263–8555, Japan

発行日:2019年8月15日Published: August 15, 2019

6 MeV/uの高電離イオン(He2+, C6+, Ne10+, Ar18+及びH+)と気体分子との衝突における全電離断面積の絶対値測定を行った。標的分子は炭化水素分子CnH2n(n=2–4), CnH2n+2(n=1–5),H2, O2, N2, H2O, CO2などである。さらに,生成イオンの質量分析を行い,部分電離断面積を求めた。全電離断面積のスケーリング則,解離における異性体効果,負イオンの生成などについて調べた。

Absolute values of net ionization cross sections and partial ionization cross sections in bare ion (charge state q=1–18) impact on simple molecules have been measured at a fixed collision energy of 6 MeV/u. The net cross sections have been found to depend weakly on the projectile charge q compared with the q2-dependence predicted by the first Born approximation, especially for high charge projectiles and/or heavy target elements. For hydrocarbon molecules, a scaling law of net ionization cross sections including collision energy, projectile charge and number of valence electrons has been proposed. Moreover, isomer effect in dissociation and production of negative ions have been studied.

Key words: HIMAC (Heavy Ion Medical Accelerator in Chiba); heavy ion collision; gaseous molecule; ionization cross section; dissociation; negative ion

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