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arXiv 1005.4460nucl-th
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在1.8 GeV/c的~（16）O（K-，K+）反应中通过双门产生双奇异超核

Production of doubly strange hypernuclei via Ξ- doorways in the 16O(K-, K+) reaction at 1.8 GeV/c

Toru Harada, Yoshiharu Hirabayashi, Atsushi Umeya

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10 pages, 3 figures
发表信息：
Phys.Lett.B690:363-368,2010
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摘要：

本文在扭曲波脉冲近似下研究了双电荷交换~（16）O（K-，K+）反应中双奇异超核16 ~-C和16 ~ Λ ~ ΛC的产生.在入射动量pK- = 1.8 GeV/c，散射角θlab = 0^{ \circ }的一步机制下，估算了K+的包容谱，即K-p \to K+ p- via p-door由p-p-ΛΛ耦合引起.计算结果表明，在16 ~ C中，14 C（0+，2+）\otimes s ~（？）~ p ~~（？）~ p ~（？）~（？）~ p ~（？）~（？）~ p ~（？）~（？）~ p ~（？）~ p ~（？）~ p ~（？）~ p ~（？）~（？）~ p ~（？）~（？）~（（1/2-，3/2-）\otimes在16 ℃时由于高动量转移q = \approx 400 MeV/c而发生电子跃迁.这些态的混合几率约为5- 9%。然而，具有14 C（0+）\otimes s2Λ的0+基态和具有14 C（2+）\otimes s2 Λ的2+激发态的布居非常小。能谱对核中N-ΛΛ耦合强度的敏感性使我们能够提取核中N-ΛΛ动力学的本质，核（K-，K+）反应可以扩展我们对S = -2世界的认识。

英文摘要：

We examine theoretically production of doubly strange hypernuclei, 16 Ξ-C and 16 ΛΛC, in doublecharge exchange 16O(K-, K+) reactions using a distorted-wave impulse approximation. The inclusive K+ spectrum at the incident momentum pK- = 1.8 GeV/c and scattering angle θlab = 0^{\circ} is estimated in a one-step mechanism, K-p \to K+Ξ- via Ξ- doorways caused by a Ξ-p-ΛΛ coupling. The calculated spectrum in the Ξ- bound region indicates that the integrated cross sections are on the order of 7-12 nb/sr for significant 1- excited states with 14C(0+, 2+) \otimes sΛpΛ configurations in 16 ΛΛC via the doorway states of the spin-stretched 15N(1/2-, 3/2-) \otimes sΞ- in 16 Ξ-C due to a high momentum transfer qΞ- \approx 400 MeV/c. The Ξ- admixture probabilities of these states are on the order of 5-9%. However, populations of the 0+ ground state with 14C(0+) \otimes s2Λ and the 2+ excited state with 14C(2+) \otimes s2 Λ are very small. The sensitivity of the spectrum on the ΞN-ΛΛ coupling strength enables us to extract the nature of ΞN-ΛΛ dynamics in nuclei, and the nuclear (K-, K+) reaction can extend our knowledge of the S = -2 world.

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