1994 Fiscal Year Final Research Report Summary
High-Energy Heavy-Ion Reactions and Polarization in Matter
| Project/Area Number |
05044056
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | Osaka University |
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Principal Investigator |
TAKAHASHI Noriaki Osaka University, 理学部, 教授 (10028152)
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| Co-Investigator(Kenkyū-buntansha) |
SCHMIDT Rudiger Technische Universitat Dresden, 教授
SCHMIDTーOTT オット ウオルフ ディータ ゲッティンゲン大学, 物理第二研究所, 教授
HASS Michael Weizmann Institute, 教授
MUNZENBERG G GSI, 主任研究員
LYNEN Uli GSI, 教授
ADACHI Minoru Tokyo Institute of Technology, 理学部, 原子核助手 (80016112)
FUJITA Yoshitaka Osaka University, 理学部, 助手 (60093457)
ISHIHARA Masayasu Tokyo University, 理学部, 教授 (40013396)
SHIMODA Tadashi Osaka University, 理学部, 助教授 (70135656)
ASAHI Kouitirou Tokyo Institute of Technology, 理学部, 助教授 (80114354)
SCHMIDTOTT Wolfdieter Universitat Gottingen
MUNZENBERG Gottfried GSI
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| Project Period (FY) |
1993 – 1994
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| Keywords | Radioactive Beam / Superfliud Helium / Snowball / Beta Detection Method / Alph Dectection Method / Nuclear Polarization |
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| Research Abstract |
Nuclei produced in high-energy heavy-ion reactions are expected to sustaning polarization. The first stage of this research is to find radioactive nuclei sustaining large polarization. Cyclotrons of Osaka University and Riken, Tandem Accelerators of Rehovot and Legnaro were utilized to investigate the possibility. The SIS-FRS system at GSI was also effective to apply for such purposes.
Possibilities of obtaining fast ions sustainig unclear polarization were tested experimentally at above laboratories ; the heavy polarized ions such as ^<93>Tc were obtained from the Legnaro tandem accelerator and the polarization and its preservation in a solid material were experimentally studied.
The implantation into liquid helium was successfully carried out and the behavior of ions and nuclear polarization was further studied. In addition to the preservation of nuclear polarization in snowballs the folllowing facts are being studied. The stopping power of fast ions in liquid helium is double valued, one component as in normal matter and fluid, the other manifested in superfluid helium sustaining a range much longer then the former. This may be due to the collective flow in HeII.The measurements were carried out with radioactive beam and beta and alpha detection methods.
The nuclear polarizaion may be destroyed when ions move in a strong electric field therefore evading the encapsulation in snowballs.
The phenomenon will be further investigated.
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