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arXiv 0906.5344nucl-th
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多$\bar{K}$超核

Multi-$\bar{K}$ hypernuclei

D. Gazda, E. Friedman, A. Gal, J. Mares

摘要:

通过在粒子稳定的核子、$Λ$和$Ξ$超子组态中加入$K^-$介子,对多$\bar{K}$超核进行了相对论平均场计算.对于一个给定的超核核心,计算出的$\bar{K}$分离能$B_{\bar{K}}$随着$\bar{K}$介子的数量超过大约10个介子而饱和,$B_{\bar{K}}$从上面以200 MeV为界。在$\bar{K}$介子密度达到峰值的小区域内,相关重子密度在2-3倍核物质密度的值处饱和,类似于多$\bar{K}$核的情况。计算表明,粒子稳定的多奇异$\{N,Λ,Ξ\}$组态对强相互作用转换$Λ\to N \bar{K}$和$Ξ\to N \bar{K} \bar{K}$是稳定的,证实并加强了强相互作用自束缚奇异强子物质中不可能发生K介子凝聚的结论.

英文摘要:

Relativistic mean field calculations of multi-$\bar{K}$ hypernuclei are performed by adding $K^-$ mesons to particle-stable configurations of nucleons, $Λ$ and $Ξ$ hyperons. For a given hypernuclear core, the calculated $\bar{K}$ separation energy $B_{\bar{K}}$ saturates with the number of $\bar{K}$ mesons for more than roughly 10 mesons, with $B_{\bar{K}}$ bounded from above by 200 MeV. The associated baryonic densities saturate at values 2-3 times nuclear-matter density within a small region where the $\bar{K}$-meson densities peak, similarly to what was found for multi-$\bar{K}$ nuclei. The calculations demonstrate that particle-stable multistrange $\{N,Λ,Ξ\}$ configurations are stable against strong-interaction conversions $Λ\to N \bar{K}$ and $Ξ\to N \bar{K} \bar{K}$, confirming and strengthening the conclusion that kaon condensation is unlikely to occur in strong-interaction self-bound strange hadronic matter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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