Production of doubly strange hypernuclei via doorways in the reaction at 1.8-GeV/c
May, 2010
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Abstract: (Elsevier)
We examine theoretically production of doubly strange hypernuclei, CΞ−16 and 16 ΛΛ C, in double-charge exchange O16(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° is estimated in a one-step mechanism, K−p→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 C14(0+,2+)⊗sΛpΛ configurations in 16 ΛΛ C via the doorway states of the spin-stretched N15(1/2−,3/2−)⊗sΞ− in CΞ−16 due to a high momentum transfer qΞ−≃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 C14(0+)⊗sΛ2 and the 2+ excited state with C14(2+)⊗sΛ2 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.Note:
- 10 pages, 3 figures
- 27.20.+n
- 21.80.+a
- 25.80.Hp
- 24.10.Eq
- Hypernuclei
- DWIA
- Xi N - Lambda Lambda coupling
- ΞN–ΛΛ coupling
- [formula omitted] coupling
- momentum transfer: high
References(41)
Figures(4)