| 研究課題/領域番号 |
23K13124
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分15020:素粒子、原子核、宇宙線および宇宙物理に関連する実験
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| 研究機関 | 大阪大学 |
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研究代表者 |
アナワット リッティロン 大阪大学, 核物理研究センター, 特任研究員 (60965763)
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| 研究期間 (年度) |
2023-04-01 – 2025-03-31
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| 研究課題ステータス |
交付 (2023年度)
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| 配分額 *注記 |
4,680千円 (直接経費: 3,600千円、間接経費: 1,080千円)
2024年度: 1,820千円 (直接経費: 1,400千円、間接経費: 420千円)
2023年度: 2,860千円 (直接経費: 2,200千円、間接経費: 660千円)
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| キーワード | CANDLES / Calcium-48 / Isotope Separation / Isotope Enrichment / Laser Isotope Separation / Enrichment |
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| 研究開始時の研究の概要 |
Neutrinoless double beta decay is a powerful method to understand the mysteries of the universe, especially the Majorana nature of neutrino. The key element is in 48Ca, but the production is challenging. This research aims to develop the cut-edge production method by laser isotope separation (LIS).
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| 研究実績の概要 |
Calcium-48 (48Ca) is a key element used in neutrinoless double beta decay research by CANDLES. As it is costly and low abundance, we are exploring the possibility of using laser isotope separation for a mass production of 48Ca. The atomic beam production system, laser system, collection systems, and large-scale production chamber have been developed. We carried out a test with a single (80mW) blue-light laser diode and observed the shift of 40Ca and 44Ca. The displacement of 40Ca and 44Ca was 6.94 mm and 2.96 mm, respectively. However, due to the lower abundance 48Ca, we are now improving the overall performance to investigate the 48Ca separation. Multiple slave lasers that generate 2W power have achieved a production rate of 10g/year. The goal and strategy to achieve a production rate of 300 kg/year are considered.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
3: やや遅れている
理由
We are currently developing the laser isotope separation for 48Ca. The current status is the test of the production of the atomic beam system and the isotope separation by one of the six ports of the main chamber. The laser test was carried out, and 40Ca and 44Ca shifts were observed. However, due to the lower abundance of 48Ca, we are now improving the overall performance to investigate the isotope separation of 48Ca. The high-power, single-frequency laser is currently being developed, as is research into atomic beam production and recovery systems. All of the systems are required to achieve mass production of 48Ca.
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| 今後の研究の推進方策 |
The plans to realize the laser isotope separation and mass production of 48Ca is to continue develop the study of the production of sheet-like atomic beam, development of collection system and the development of main chamber irradiation unit. We are now testing with single crucible, single laser, and collection system by the large main chamber. We aim to investigate the isotope separation of 48Ca with the above system. After that, we will set the high power of laser with a multiple nozzle to increase the atomic beam intensity and study the deflection of 48Ca. We aim to recovery the calcium from the collection surface and then measure the isotope ratio on each region by ICP-MS.
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