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1999 Fiscal Year Final Research Report Summary

Development of a versatile method to produce spin-polarized radioactive nuclear beams

Research Project

Project/Area Number 10304020
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionOsaka University

Principal Investigator

NORIAKI Takahashi  Graduate School of Science, Professor, 大学院・理学研究科, 教授 (10028152)

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)
Project Period (FY) 1998 – 1999
Keywordsunstable nucleus / neutron halo nucleus / magnetic moment / spin polarization / transfer of spin-polarized electron / laser optical pumping / Ti : Sapphire laser / beam-foil spectroscopy
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.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] S. Shimizu et al.: "High Precision Polarimeter System for Atomic Polarization and Tilted-Foil Experiments with 1.7 KeV/amu 14N^+ Beam"Review of Scientific Instruments. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Shimoda: "Development of Polarized radioactive nuclear beams"Proc. Of the RCNP Workshop on spin polarized nuclear fusions. 91-100 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 堂本英司: "2.45GHz Compact ECR イオン源の現状"「多価イオン生成用高効率小型 ECR イオン源」ワークショップ報告集. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S. Shimizu et al.: "High Precision Polarimeter System for Atomic Polarization and Tilted-Foil Experiments with 1.7 KeV/amu 14NィイD1+ィエD1 Beam."Review of Scientific Instruments. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Shimoda: "Development of polarized radioactive nuclear beams."Proc. of the RCNP Workshop on spin polarized nuclear fusions. 91-100 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E. Doumoto: "Present Status of the 2.45 GHzCompact ECR Ion-Source"Proc. of the Workshop on "Highly Efficient Compact ECR Ion-Sources for Multiply Charged Ions". (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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