| Project/Area Number |
24654060
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
IWATA Yoshihiro 独立行政法人日本原子力研究開発機構, 大洗研究開発センター, 研究員 (20568191)
|
|---|
| Project Period (FY) |
2012-04-01 – 2014-03-31
|
| Project Status |
Completed (Fiscal Year 2013)
|
| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
|
|---|
| Keywords | 宇宙物理 / 共鳴レーザーイオン化 / ラドン / レーザー共鳴イオン化 / レーザーイオン化 |
|---|
| Research Abstract |
Radon is one of the major background sources in low energy experiments. Accordingly it is essential to suppress radon events in future large-scale xenon detectors aiming for dark matter and neutrino-less double beta decay. Although the removal of argon and krypton from xenon is well established using distillation, because radon is continuously emanated from all the materials, the technique cannnot be used. We propose a new radon removal method for xenon using a resonance-enhanced multiphoton ionization process. A tunable laser is used to promote radon atoms to an electronically excited state via resonant single- or multiple-photon absorption and these excited radon atoms are then ionized by the introduction of another photon. With this method radon impurities can be selectively ionized and removed with an applied electric field. In this study, we have successfully demonstrated this principle.
|
