2012 Fiscal Year Final Research Report
Formation mechanism of magic numbers in unstable nuclei
| Project/Area Number |
22740150
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2010 – 2012
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| Keywords | 原子核(実験) / 不安定核ビーム / 魔法数 / 質量測定 / 飛行時間法 / 磁気分析装置 |
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| Research Abstract |
We developed the method to determine nuclear masses of radioactive ions (RI’s) by coincidence measurements of magnetic rigidity and flight time in a long flight path. Those RI’s were produced by intermediate-energy fragmentation reactions from intense heavy-ion beam. CVD diamond detectors were manufactured as the fundamental detector to measure flight time. The time resolution of its detector was achieved to be 30 ps in sigma for carbon ions at 300 MeV per nucleon. A correction method in measured particle momenta was also developed by using the experimentally-determined ion-optical transfer matrix of the beam line. We demonstrated to improve the momentum resolution of the beam line form 1/3000 to 1/8100 by adopting this correction method. By those improvements, this mass measurement method was evaluated to achieve a mass resolution of several hundreds keV for the nuclei around mass number 50.
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