| Project/Area Number |
08239104
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Research Institution | OSAKA ELECTRO-COMMUNICATION UNIVERSITY |
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Principal Investigator |
MOTOBA Toshio OSAKA ELECTRO-COMMUNICATION UNIVERSITY, Lab. of Physics, Professor, 工学部, 教授 (90121863)
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| Co-Investigator(Kenkyū-buntansha) |
OKA Makoto Dept. Physics, Tokyo Institute of Technology, Professor, 理学部, 教授 (60144606)
YAZAKI Kouichi Dept. Physics, University of Tokyo, Professor, 大学院・理学研究科, 教授 (60012382)
AKAISHI Yoshinori High Energy Accelerator Research Organization, Professor, 素核研, 教授 (50001839)
ITONAGA Kazunori Lab. of Physics, Miyazaki Medical College, Professor, 医学部, 教授 (90029546)
YAMAMOTO Yasuo Dept. literature, Tsuru University, Professor, 文学部, 教授 (80124866)
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥24,500,000 (Direct Cost: ¥24,500,000)
Fiscal Year 1998: ¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1997: ¥9,000,000 (Direct Cost: ¥9,000,000)
Fiscal Year 1996: ¥8,000,000 (Direct Cost: ¥8,000,000)
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| Keywords | Hypernucleus / Hyperon-nucleon interaction / Nonmesonic weak decay / Hypernuclear lifetime / Strangeness halo / Double hypernucleus / H-particle / Quark Model / ハイパー原子核 / ダブルハイパー核 / ハイパロン核子相互作用 / パイ中間子型弱崩壊 / ストレンジネス・ハロ- / グザイ・ハイパー核 / 非中間子崩壊 / 中間子型弱崩壊 |
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| Research Abstract |
The project consists of five major subjects which lead to the following achievements. (1) The microscopic three- and four-body cluster model calculations have been carried out for spectroscopy of light hypernuclei : The shrinkage of the nuclear core under the effect of Λ participation has been confirmed. The role of spin-spin and spin-orbit ΛN interactions has been analysed. It has been revealed that the admixture of Σ component into the mass-4 Λ hypernuclear low-lying states has a characteristic role reflecting the properties of YN interaction adopted. The in-flight and stopped (K-, π) reaction spectra are successfully explained by the DWIA calculation. (2) Several theoretical attempts have been presented to evaluate the production rates of double-Λ hypernuclei. The effect of hyperon mixing has been also investigated in typical S = -2 systems. (3) It is remarkable that several meson theoretical models of new YN and YY interactions have been presented to be tested in the hypernuclear structure. Moreover the quark models also presented several versions of the baryon-baryon interactions. The quark model has been extended to evaluate the interaction of the H particles in nuclear matter. (4) In order to explain new experimental data of hypernuclear weak decays (lifetimes), the correlated two-pion exchange process and the direct (quark process were evaluated in addition to the OPE process. It has been found that they have both certain favorable effects but are not always sufficient. (5) The important calculational methods have been applied and developed in the research project : the typical examples are the quantum molecular dynamics (QMD) approach, the Gaussian basis coupled-rearrangement channel method and the complex scaling method.
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