2011 Fiscal Year Final Research Report
Investigation of unexpectedly high-energy electron emission from water vapor by the impact of carbon ions with Bragg-peak energies and track analysis
| Project/Area Number |
21540408
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Atomic/Molecular/Quantum electronics
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| Research Institution | Kyoto University |
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Principal Investigator |
OHSAWA Daisuke 京都大学, 放射性同位元素総合センター, 助教 (90324681)
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| Co-Investigator(Kenkyū-buntansha) |
TOSAKI Mitsuo 京都大学, 放射性同位元素総合センター, 准教授 (70207570)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 原子 / 分子 |
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| Research Abstract |
Further improving our previous apparatus, we have successfully measured absolute double differential cross section(DDCS) for secondary electron emission from water vapor by the impact of carbon ions with Bragg-peak energies. The angular distributions of DDCSs disagreed with the CDW-EIS theoretical calculation at the backward angles(> 100°), while single differential cross section(SDCS) agreed well with the CDW-EIS, particularly in the low-energy region(<200 eV), suggesting the contribution of Fermi-Shuttle acceleration to the ion-atom collisions is rather small for heavy-ion impact with incident energies of several MeV/u or higher. Comparisons of radial dose distributions for the carbon ions, deduced form Monte-carlo track simulation, with the Chatterjee model showed meaningful and significant discrepancies in the core region, implying the necessity of corrections of the model.
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