Application of spin conversion reactions of positronium for analyzing the atomic scatterings
| Project/Area Number |
15H03703
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | The University of Tokyo |
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Principal Investigator |
Saito Haruo 東京大学, 大学院総合文化研究科, 教授 (60235059)
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| Co-Investigator(Kenkyū-buntansha) |
澁谷 憲悟 東京大学, 大学院総合文化研究科, 助教 (20415425)
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| Research Collaborator |
HOSOTANI Ryosuke
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥14,690,000 (Direct Cost: ¥11,300,000、Indirect Cost: ¥3,390,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2015: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
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| Keywords | 陽電子 / ポジトロニウム / スピン軌道相互作用 / スピン転換 / 原子衝突 / 散乱長 / 部分波解析 / 原子散乱 / スピン－軌道相互作用 / 電子対消滅放射線 / シンチレーション検出器 / デジタルオシロスコープ / 原子分子衝突 / 消滅放射線 / 消滅ガンマ線 / ランタンブロマイドシンチレーション検出器 / 原子・分子物理 / 原子分子散乱 / LaBr3(Ce)シンチレーション検出器 |
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| Outline of Final Research Achievements |
We have studied atomic scatterings of positronium (Ps) in the ultra-low-energy region less than 100 meV by using Ps spin-conversion reaction which is forbidden in the s-wave scatterings (L=0). We have analyzed the data of the Ps annihilation rates and the momentum transfer cross-section in gaseous xenon obtained by our new positron annihilation spectrometer by means of a partial-wave expansion method. We have determined the Ps-Xe scattering length to be 2.06 a.u., which indicates that the Xe potential push out the Ps wave and delays the phase while the long-range interaction is van der Waals force. This results are qualitatively consistent with some theoretical predictions; however, some quantitative discrepancies are remained to be studied in the future works.
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Report
(4 results)
Research Products
(13 results)
