| Project/Area Number |
07640379
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | University of Tokyo |
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Principal Investigator |
AKAISHI Yoshinori University of Tokyo, Institute for Nuclear Study, Professor, 原子核研究所, 教授 (50001839)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1996: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1995: ¥700,000 (Direct Cost: ¥700,000)
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| Keywords | Strangeness / Hypernucleus / Double Hypernucleus / Cascade particle / Lambda particle / エキゾチック原子 / ラムダ核 / グザイ核 / グザイ粒子 |
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| Research Abstract |
The possibility of observing heavy *-hypemuclei by the (K^-, K^+) reaction is discussed. Several narrow peaks are clearly seen in the calculated K^+ spectrum of ^<208>Pb (K^-, K^+)^<208>*Hg, which correspond to *-bound states with spin-stretched high angular momentum. The excitation of the *-bound states amounts to about 0.5 mub/sr/MeV for the ^<208>Pb target which makes the experiment feasible.
There is a possibility that the lightest double-A hypemucleus *H is abundantly populated by stopping * on ^4He. Its formation branching is about 15%. A stopped *on ^9Be also produces efficiently a variety of AA hyperfragments. They emit weak-decay pions with an discrete energy which provide a means of mass spectroscopy of AA hypernuclel, In the case of S=-2 five-body system an excited state *H is predicted to appear with 'strangeness halo' and the ground state *H with almost pure AA component. The 50 GeV proton synchrotron planned in Japan would enable us to investigate the double-strangeness sector of the nuclear chart.
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