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INTERACTION OF BETA-RADIOACTIVE ATOMS IN LIQUID HELIUM

Research Project

Project/Area Number 04640299
Research Category

Grant-in-Aid for General Scientific Research (C)

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

Principal Investigator

TAKAHASHI Noriaki  Osaka University, College of General Education, Professor, 教養部, 教授 (10028152)

Co-Investigator(Kenkyū-buntansha) MIYATAKE Hiroari  Osaka University, College of General Education, Research Associate, 教養部, 助手 (50190799)
ITAHASHI Takahisa  Osaka University, Research Center for Nuclear Physics, Associate Professor, 核物理研究センター, 助教授 (20112071)
FUJITA Yoshitaka  Osaka University, College of General Education, Research Associate, 教養部, 助手 (60093457)
SHIMODA Tadashi  Osaka University, College of General Education, Associate Professor, 教養部, 助教授 (70135656)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1993: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1992: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsRadioactive nuclear beam / Superfuluid helium / Snowball / Beta detection method / Alpha detection method / Nuclear polarization / Cluster / ベータ線
Research Abstract

Radioactive he, Li andB isotopes produced by heavy-ion reactions were ofrmed into fast radioactive nuclear beans and were introduced into liquid helium. Most of the introduced ions are nutralized but still some remain as singly-charged ions. Their spatial distribution changes with time. Solid-state alpha-and teta-ray detectors and pasition sensitive beta-ray detectors enabled us to indentify and trace the spatial distributions. With use of detectors interactions of impurity ions and Bose condensation waer studied. Ion planted solid state detectors working at liquid He temperature were mounted in a cryostat and the study of interaction of impurity ions with superfluid helium became passible only after the ontroduction of the two detection methods stated above. The detection efficiency largely exceeded that of the conventional electric aharge measurements. A cryostat incorporating of 1.2 K.Heavy-ion beams obtained from the ring cyclotron of RCNP, Osaka Unversity were led to the secondary beam (EN) course and radioactive nuclear beans were formed. The behavior of ions and neutralized atoms was studied with use of Li and B.Nuclear spin polarization was proved for the first time to ve maintained in a micro-cluster of He atoms in superfluid helium. A huge first stop has been trodden for the study of nuclear, low-temperature and condensed-matter (say cluster) Physices.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] Noriaki Takahashi: "Snowballs:Micro-Clusters Versatile in Nuclear and Condensed-Matter Physics" Nuclear Structure and Interdisciplinary Topics. 238-245 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] H.Okuno et al.: "Polarization in Projectile Fragmentation and g-Factor Measurements for Neutron-Rich Nuclei" Hyperfine Interactions. 78. 97-103 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takahashi et al.: "Freezing-Out of Nuclear Polarization in Core Ions of Micro-Clusters “Snowballs" in Superfluid Helium" Nuclear Shapes and Nuclear Structure at Low Exitation Energy. (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takahashi: "Heavy-Ion Polarization at RCNP-Retrospect and Development into a New Phase-" Spin-Isospin Responses and Weak Processes in Hadrons and Nuclei. (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Shimoda et al.: "Huge Spin-Polarization Observed in (^<14>N,^<12>B) Reactions on Au,Cu and Be at 40 MeV/u." Spin-Isospin Responses and Weak Processes in Hadrons and Nuclei. (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takahashi et al.: "Freezing-Out of Nuclear Polarization in Core Ions of Micro-Clusters “Snowballs" in Superfluid Helium" Spin-Isospin Responses and Weak Processes in Hadrons and Nuclei. (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Noriaki Takahashi: "Snowballs : micro-Clusters Versatile in Nuclear and Condensed-Matter Physics" Nuclear Structure and Interdisciplinary Topics. 238-245 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] H.Okuno et al.: "Plarization in Projectile Fragmentation and g-Factor Measurements for Neutron-Rich Nuclei" Hyperfine Interactions. 78. 97-103 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takahashi et al.: "Freezing-Out of Nuclear Polarization In Core Ions of Micro-Clusters "Snowballs" in Superfluid Helium" Nuclear Shapes and Nuclear Structure at Low Exitation Energy. (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takahashi: "Heavy-Ion Polarization at RCNP-Retrospect and Development into a New Phase-" Spin-Isospin Responses and Weal Processes in Hadrons and Nuclei. (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Shimoda et al.: "Huge Spin-Polatization Observed in (^<14>N, ^<12>B) reactions on Au, Cu and be at 40 MeV/u" Spin-Isospin Responses and Weak Processes in Hadrons and Nuclei. (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takahashi et al.: "Ffeezing-Out of Nuclear Polarization in Cre Ions of Micro-Clusters "Snowballs" in Superfluid Helium" Spin-Isospin Responses and Weak Processes in Hadrons and Nuclei. (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Noriaki Takahashi: "Snowballs:Micro-Clusters Versatile in Nuclear and Condensed-Matter Physics" Nuclear Structure and Interdisciplinary Topics. 238-245 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.Okuno et al.: "Polarization in Projectile Fragmentation and g-Factor Measurements for Neutron-Rich Nuclei" Hyperfine Interactions. 78. 97-103 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] N.Takahashi et al.: "Freezing-Out of Nuclear Polarization in Core Ions of Micro-Clusters“Snowballs"in Superfluid Helium" Nuclear Shapes and Nuclear Structure at Low Exitation Energy. (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] N.Takahashi: "Heavy-Ion Polarization at RCNP-Retrospect and Development into a New Phase-" Spin-Isospin Responses and Weak Processes in Hadrons and Nuclei. (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] T.Shimoda et al.: "Huge Spin-Polarization Observed in (^<14>N,^<12>B) Reactions on Au,Cu and Be at 40 MeV/u" Spin-Isospin Responses and Weak Processes in Hadrons and Nuclei. (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] N.Takahashi et al.: "Freezing-Out of Nuclear Polarization in Core Ions of Micro-Clusters“Snowballs"in Superfluid Helium" Spin-Isospin Responses and Weak Processes in Hadrons and Nuclei. (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Asahi: "Spin-Oriented Projectile Fragments:The First Application To g-Factor Measurements" Hyperfine Interactions. 75. 101-108 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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