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Physics with Radioactive Microclusters in He II

Research Project

Project/Area Number 07044086
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionOsaka University, Graduate School of Science

Principal Investigator

TAKAHASHI Noriaki  Graduate School of Science, Osaka University,, 大学院・理学研究科, 教授 (10028152)

Co-Investigator(Kenkyū-buntansha) HASS Michael  Weizmann Institute of Science, 教授
TRAUTMANN Wolfgang  GSI, 研究員
SCHMIDT Rudiger  Technical University Dresden, 教授
MUNZENBERG G  GSI(核化学), 主任研究員
LYNEN Uli  GSI, 教授
MIYATAKE Hiroari  Institute of Nuclear Study, Tokyo University, 原子核研究所, 助教授 (50190799)
FUJITA Yoshitaka  Faculty of Science, Osaka University,, 理学部・原子核施設, 助教授 (60093457)
SHIMODA Tadashi  Graduate School of Science, Osaka University,, 大学院・理学研究科, 助教授 (70135656)
ASAHI Koichiro  Faculty of Science, Tokyo Institute of Technology, 理学部, 助教授 (80114354)
MUNZENBERG Gottfried  GSI
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥8,200,000 (Direct Cost: ¥8,200,000)
Fiscal Year 1996: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1995: ¥4,400,000 (Direct Cost: ¥4,400,000)
Keywordsradioactive beam / short lived nucleus / nuclear polarization / superfluid helium / impurity ion / snowball / iceberg / radiation detection method
Research Abstract

This project aims at obtaining basic understanding on the contribution of impurities in superfluid helium.
An impurity ion forms a cluster of helium atoms around itself, owing to the electrostriction exerted by the ion. The mobility of such a cluster is extremely small as compared to a bare ion, if it exists at all, or a neutral atom.
The specific features of the research here is to use radioactive impurities to enable detection of various kinds of impurities.
From out studies, it has become clear that such impurities are produced in superfluid helium by implantation of high-speed radioactive nuclear beams, and the charged impurities can be transported in the electric field. Thus trapping of such impurities is realizable.
Nuclear polarization of impurities encapsulated in snowball is preserved. If the electric field is quite strong ions may migrate free from the surrounding cluster shell and the polarization seems to be lost. Neutrals have no polarization conserved.
Based on the facts, gathered from our unique research, a new field of physics branching on nuclear physics and condensed-matter physics will be cultivated by using a radioactive nuclear beams from the SIS and FRS system of the GSI Darmstadt in cooperation with GSI and other institutions. The nuclear structure and spectroscopy of radioactive nuclei far from the stability line stressed on the control of nuclear spin is in the former field. Structure of clusters and the interaction of impurities with the bulk superfluid helium belongs to the latter field. It can be emphasized that the detection efficiency of clusters "snowballs" became by many orders of magnitude more sensitive by the detection methods developed here.
The trapping of radioactive nuclei is also an interesting subject and this will be applied in a wide field of nuclear and particle physics.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] N.Takahashi,et.al.: "Radioactive Core Ions of Microclusters, "Snowballs" in Superfluid Helium" Hyperfine Interactions. 103. 351-358 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takahashi,et.al.: "Freezing-Out of Nuclear Polarization in Radioactive Core Ions of Microclusters, "Snowballs" in Superfluid Helium" Hyperfine Interactions. 97/8. 469-477 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takahashi,et.al.: "Snowballs of Radioactive Ions -Nuclear Spin Polarization of Core Ions" Zeitschrift fur Physik B. 98. 347-351 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takahashi, et al.: "Radioactive Core Ions of Microclusters, "Snowballs" in Superfluid Helium" Hyperfine Interactions. 103. 351-358 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takahashi, et al.: "Freezing-Out of Nuclear Polarization in Radioactive Core Ions of Microclusters, "Snowballs" in Superfluid Helium" Hyperfine Interactions. 97/8. 469-477 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takahashi, et al.: "Snowballs of Radioactive Ions -Nuclear Spin Polarization of Core Ions" Zeitschrift fur Physik B. 98. 347-351 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takahashi,et.al.: "Radioactive Core Ions of Microclusters,“Snowballs"in Superfluid Helium" Hyperfine Interactions. 103. 351-358 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] N.Takahashi,et.al.: "Freezing-Out of Nuclear Polarization in Radioactive Core Ions of Microclusters,“Snowballs"in Superfluid Helium" Hyperfine Interactions. 97/8. 469-477 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] N.Takahashi,et.al.: "Snowballs of Radioactive Ions-Nuclear Spin Polarization of Core Ions" Zeitschrift fur Physik B. 98. 347-351 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] N.Takahashi,T.Shimoda,H.Miyatake,S.Mitsuoka,...K.Asahi,S.Morinobu: "Freezing-Out of Nuclear Polarization in Radioactive Core Ions of Microclusters,“Snowballs" in Superfluid Helium" Hyperfine Interactions. 97/8. 469-477 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] N.Takahashi,T.Shimoda,Y.Fujita,T.Itahashi,H.Miyatake: "Snowballs of Radioactive Ions-Nuclear Spin Polarization of Core Ions" Zeitschrift fur Physik B. 98. 347-351 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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