p-Shell Hypernuclei via (K^-, π^-), (π^+, K^+) and (Stopped K^-, π^-) Reactions : A Systematic Calculation with Configuration Mixing : Nuclear Physics

概要

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Systematic analyses of the strangeness-changing reactions on p-shell targets (^9Be, ^<10,11>B, ^<12,13>C and ^<14,15>N) have been performed in DWIA and with the configuration-mixed shell-model wavefunctions. The recoil effects for the outgoing meson and nucleon and Λ in the nucleus are correctly taken into account.The quasi-free continuum part of the excitation function is appoximated by smearing the calculated strengths leading to the shell-model states with Λ in the (1s, 0d)^Λ and (1p, 0f)^Λ orbits. For each target, the calculated excitation functions for the three reactions are compared, showing the useful and complementary roles in hypernuclear spectroscopy. By comparing the (K^-, π^-) peaks and (π^+, K^+) peaks in the same energy region, for example, for ^<12>_ΛC,^<13>_ΛC and ^<14>_ΛN, respectively, typical energy shifts are predicted because of the change of attributable J-structures. The angular distributions of the differential cross sections are also presented for the prominent peaks with the discussion of the absolute values and the recoil effects. The (stopped K^-,π^-) reaction results also in well-separated peaks in the bound-state region in ^<10>_ΛB, ^<12>_ΛC and ^<13>_ΛC. The present calculations not only give reasonable explanations on the existing experimental data but also present the detailed theoretical predictions on the p-shell hypernuclear structures with A≥10.
理論物理学刊行会の論文
1990-08-25