1999 Fiscal Year Final Research Report Summary
Development of a versatile method to produce spin-polarized radioactive nuclear beams
| Project/Area Number |
10304020
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | Osaka University |
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Principal Investigator |
NORIAKI Takahashi Graduate School of Science, Professor, 大学院・理学研究科, 教授 (10028152)
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| Co-Investigator(Kenkyū-buntansha) |
IZUMI Hideaki Graduate School of Science, Osaka University Research Associate, 大学院・理学研究科, 助手 (50294153)
SHIMIZU Suguru Graduate School of Science, Osaka University Research Associate, 大学院・理学研究科, 助手 (60294146)
SHIMODA Tadashi Graduate School of Science, Osaka University Associate Professor, 大学院・理学研究科, 助教授 (70135656)
MIYATAKE Hiroari Organization of High Energy Accelerator, KEK, Associate Professor, 助教授 (50190799)
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| Project Period (FY) |
1998 – 1999
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| Keywords | unstable nucleus / neutron halo nucleus / magnetic moment / spin polarization / transfer of spin-polarized electron / laser optical pumping / Ti : Sapphire laser / beam-foil spectroscopy |
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| Research Abstract |
The feasibility of producing spin polarization for radioactive nuclear beams has been investigated. The prescription of this versatile method is (i) to spin-polarize the outermost electron in Rb via laser optical pumping and (ii) to transfer the electron to the radioactive nuclear beam ion and (iii) to polarize the nuclear spin through the hyperfine interaction. This method is quite successful for proton. Although the method is essentially applicable for a wide variety of nuclear species, no application has been tried for ions heavier than helium. The feasibility must be investigated on (i) how much we can reduce the depolarization effects after the electron transfer process and (ii) how high transmission efficiency we can achieve for the radioactive nuclear beams.
We have constructed a test stand and started the feasibility test of this new method at Research Center for Nuclear Physics, Osaka University, prior to the completion of high intensity radioactive beam facilities such as ISAC at TRIUMF or E-arena at JHF. Instead of the radioactive nuclear beams, stable beams have been used. The nuclear polarization has been measured by the method of the beam-foil spectroscopy.
The test stand has just completed. At the first trial we have successfully observed 2 % spin polarization for the 14N nucleus. The transmission efficiency was approximately 60%. These results are very promising for the practical application. We have started detailed investigation to increase the nuclear polarization.
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