2013 Fiscal Year Final Research Report
Improvement of a spin polarizing system for unstable nuclei
| Project/Area Number |
23540335
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Tohoku University |
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Principal Investigator |
WAKUI TAKASHI 東北大学, サイクロトロン・ラジオアイソトープセンター, 助教 (70359644)
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| Co-Investigator(Kenkyū-buntansha) |
SHINOZUKA Tsutomu 東北大学, サイクロトロン・ラジオアイソトープセンター, 非常勤講師 (10134066)
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| Project Period (FY) |
2011 – 2013
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| Keywords | スピン偏極 / 不安定核 / 芳香族分子 / 固体標的 |
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| Research Abstract |
To study nuclear moments of neutron-rich nuclei in medium mass region, we have been developing a nuclear spin polarizing system for unstable nuclei. The system is used at CYRIC with slow RI beam from the RF ion guide isotope separator on-line. The system thus works in vacuum, room temperature, and low magnetic field, under which nuclear spin polarization has not been realized so far. In this study, we have newly installed an Ar-ion laser instead of a Nd:YAG laser for the optical excitation, and a cooling mechanism for the crystal in which protons are polarized. After the optimization of polarization parameters such as pulse width and repetition rate for the laser and temperature of the crystal, we have conducted polarizing tests. From the results, the polarization is more than 10 times higher than that before this study. We have succeeded in increasing the polarization by the improvement of the polarizing system.
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