| Budget Amount *help |
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2003: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2002: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2001: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Research Abstract |
We have predicted deeply bound narrow kaonic nuclear states based on bare KN interactions, which were derived from empirical data. The presence of such hitherto unknown kaonic nuclear states results from a very attractive KN interaction in the I=0 channel and causes not only a strong binding of kaon in proton-rich nuclei, but also an enormous shrinkage of kaonic nuclei despite the hard nuclear incompressibility. Thus, a kaon produces a bound state with a K-mediated "condensed nucleus", which does not exist by itself. For example, ppK- with a total binding energy of -E_K=48 MeV,ppnK with -E_K=118 MeV, and pppK with -E_K=97 MeV. In ppnK the average nucleon density is 3.1 times larger than the normal density,
We discussed the implications of recently discovered strange tribaryons in ^4He(stopped-K^-, p) S^0(3115) and ^4He(stopped-K^-, n) S^1 (3140) within the framework of deeply bound kaonic states formed on shrunk nuclear cores. S^1 (3140) corresponds to T=0 ppnK^-, whereas S^0 (3115) to T=1 pnnK^-, The observed binding energies were accounted for by including the relativistic effect and by invoking a medium-enhanced KN interaction by 15%.
The observation of such a deeply bound state would not only confirm the underlying physics framework, but would also provide profound information on an in-medium modification of the KN interaction, chiral symmetry restoration and kaon condensation regime.
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