1990 Fiscal Year Final Research Report Summary
Measurement of Nuclear Moment by Ion Trapping of Unstable Nuclei and Lasermicrowawt Double Resonance Method.
| Project/Area Number |
01460013
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
核・宇宙線・素粒子
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| Research Institution | Tohoku University |
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Principal Investigator |
FUJIOKA M. Cyclotron and RI Center, Tohoku Univ. Professor, サイクロトロン・ラジオアイソトープセンター, 教授 (70016111)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUKI S. Research Center for Nucl. Phys. Osaka Asist. Professor Univ., 核物理研究センター, 助教授 (50037941)
YAGI M. Inst. for Materials Res., Tohoku Univ. Professor, 金属材料研究所, 教授 (10004269)
SHINOZUKA T. Cyclotron and RI Center, Tohoku Univ. Res. Associate, サイクロトロン・ラジオアイソトープセンター, 助手 (10134066)
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| Project Period (FY) |
1989 – 1990
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| Keywords | ion trap / RF trap / Paul trap / ions of unstable nuclei / ^<87>S_rII / Hyperfine constant / precision measurement / mass separator |
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| Research Abstract |
An RF trap (or Paul trap) was constructed for hyperfine-structure study of trapped ions with a laser-microwave double-resonance method. Confinement capability of the trap was initially tested by an electrcal detection of reinforced collective motion of gas ions, i.e., N<@D22@>D2<@D1+@>D1 and K<@D2r@>D2<@D1+@>D1. Then we connected the trap to a mass separator via a differential pumping section and implanted mass-separated S<@D2r@>D2<@D1+@>D1 on to a filament of surface ionizer on the wold of the trap, and by heating the filament ionized and trapped <@D188r@>D1S<@D2r@>D2<@D1+@>D1 and <@D187@>D1S<@D2r@>D2<@D1+@>D1. The laser light necessary to excite the <@D12@>D1S<@D21/2->@>D2 <@D12@>D1P<@D23/2@>D2 transition of <@D187@>D1S<@D2r@>D2<@D1+@>D1 was prepared by a frequency doubling of 842 nm laser light from a tunab le dye laser with stylil a dye and a non-linear crystal of KN60<@D23@>D2. We succeeded in detecting with a photon counting system the fluorescent light of 421 nm from the trapped <@D187@>D1S<@D2r@>D2<@D1+@>D1 and observed optical pumping of hyperfine-splitted ground state of <@D187@>D1S<@D2r@>D2<@D1+@>D1 . This pumping was destroyed by a microwave of high-precision frequency, and from the resonance of destruction as observed by the laser fluorescence, i.e., by the lase-microwave double-resonance method, we succeeded in measu ring the hyperfine constant of <@D187@>D1S<@D2r@>D2<@D1+@>D1 (= <@D187@>D1S<@D2r@>D2II) to be upsilon=5002.40(] SY.+-.[) 0.14 MHz. The present result of upsilon it 36 times more accurate than the previous one of upsilon=5002.5+5.OMHz.
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