High-Energy Heavy-Ion Reactions and Polarization in Matter
Grant-in-Aid for Overseas Scientific Survey.
|Research Institution||Osaka University|
TAKAHASHI Noriaki Osaka University, 理学部, 教授 (10028152)
NEUGART Rain マインツ大学, 物理学研究所, 主任研究員
SCHMIDTーOTT ゲッティンゲン大学, 物理第二研究所, 教授
BROUDE Cyril ワイツマン研究所, 教授
MUNZENBERG G GSI, 主任研究員
LYNEN Uli GSI, 教授
足立 実 東京工業大学, 理学部, 原子核助手 (80016112)
藤田 佳孝 大阪大学, 理学部, 助手 (60093457)
石原 正泰 東京大学, 理学部, 教授 (40013396)
下田 正 大阪大学, 理学部, 助教授 (70135656)
旭 耕一郎 東京工業大学, 理学部, 助教授 (80114354)
SCHMIDT Rudi ドレスデン工科大学, 教授
HASS Michael Weizmann Institute, 教授
SCHMIDT Rudiger Technische Universitat Dresden
SCHMIDTOTT Wolfdieter Universitat Gottingen
MUNZENBERG Gottfried GSI
ADACHI Minoru Tokyo Institute of Technology
ISHIHARA Masayasu Tokyo University
FUJITA Yoshitaka Osaka University
ASAHI Kouitirou Tokyo Institute of Technology
SHIMODA Tadashi Osaka University
|Project Fiscal Year
1993 – 1994
Completed(Fiscal Year 1994)
|Budget Amount *help
¥7,000,000 (Direct Cost : ¥7,000,000)
Fiscal Year 1994 : ¥3,500,000 (Direct Cost : ¥3,500,000)
Fiscal Year 1993 : ¥3,500,000 (Direct Cost : ¥3,500,000)
|Keywords||Radioactive Beam / Superfliud Helium / Snowball / Beta Detection Method / Alph Dectection Method / Nuclear Polarization / 放射性核ビーム / 超流動ヘリウム / 氷球粒子 / ベータ線検出法 / アルファ線検出法 / 核偏極|
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.
Research Output (11results)