Structure and Production of Kaonic Nuclei
| Project/Area Number |
13640305
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
素粒子・核・宇宙線
|
|---|
| Research Institution | High Energy Accelerator Research Organization |
|---|
Principal Investigator |
AKAISHI Yoshinori High Energy Accelerator Research Organization, Institute of Particle and Nuclear Studies, Professor, 素粒子原子核研究所, 教授 (50001839)
|
|---|
| Project Period (FY) |
2001 – 2003
|
| Project Status |
Completed (Fiscal Year 2003)
|
| 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)
|
|---|
| Keywords | kaon / strangeness / kaonic nucleus / kaon condensation / ケイ中間子 / ハドロン質量 / ケイオン・核子相互作用 |
|---|
| 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.
|
Report
(4 results)
Research Products
(31 results)
