Study of Λ 12 C and Λ 56 Fe hypernuclei by (π+, K+) reactions at the KEK 12GeV PShypernuclei by (π+, K+) reactions at the KEK 12GeV PS

Energy spectra of Λ 12 C and Λ 56 Fe have been measured by means of (π+, K+) reactions at the KEK 12 GeV PS. The spectrometer PIK, which has large angular and momentum acceptance and medium energy resolution, has been constructed to study the reaction. The differential cross-section of the (π+, K+) reaction at forward angles θK∼(0÷6)o for the ground state of Λ 12 C and that for the effectively Λ-bound region of Λ 56 Fe agree well with the DWIA calculation using single-particle Λ wave functions obtained from a Woods-Saxon potential. The spectrum of Λ 56 Fe is consistent with the DWIA calculation using the realistic distribution of the hole-state strengths in55Fe.