1997 Fiscal Year Final Research Report Summary
Theoretical Analyses of Production and Weak Decay of Hypernuclei with Strangeness=-2
| Project/Area Number |
07640424
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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 | OSAKA ELECTRO-COMMUNICATION UNIVERSITY |
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Principal Investigator |
MOTOBA Toshio Research Center for Physics and Mathematics, Professor, 工学部, 教授 (90121863)
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| Co-Investigator(Kenkyū-buntansha) |
ITONAGA Kazumori Miyazaki Medical College, Professor, 医学部, 教授 (90029546)
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| Project Period (FY) |
1995 – 1997
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| Keywords | Hypernucleus / Hyperon-nucleon interaction / Pionic weak decay / Nonmesonic weak decay / strangeness halo / Hypernuclear lifetime / ダブルハイパー核 |
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| Research Abstract |
Starting with the (K^-, K^+) reaction on nuclear targets of mass number 9-12, the probabilities of producing double-LAMBDA and single-LAMBDA hyperfragments at the reaction points have been evaluated on the basis of the statistical model. First, the XI particle produced abundantly in the quasi-free region is shown to be well absorbed into the nucleus through the XI slowdown by knocking out a nucleon. Then the formation of a double-lambda compaound nuclear system is assumed together with its subsequent breaking-up into various hyperfragments. Theoretical pion spectra are presented for the weak decays of the double-lambda and single-LAMBDA hypernuclei produced efficiently in this scinario, which can be utilized for the identification of their hyperfragments production. it is proposed that the observation of <LAMBDALAMBDA>^^^ He with the ^9Be target is most feasible and promising. Mesonic decay spectra for the other p-shell double-LAMBDA hypernuclei have been systematically calculated.
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