Abstract
A spectroscopic study of Λ hypernuclei by the (π+, K+) reaction has been performed for the wide hypernuclear mass range using a new superconducting kaon spectrometer (INS-SKS) at the KEK 12 GeV PS. A Λ12C spectrum with 2 MeV (FWHM) energy resolution was measured and core excited states of Λ12C were clearly identified for the first time. It is discussed that the excitation energies and cross sections of these states will be closely related with the choice of ΛN interaction models as well as hypernuclear structure. Hypernuclear spectra of Λ10B, Λ28Si, Λ89Y, Λ139La and Λ208Pb were also obtained and binding energies of a Λ hyperon were deduced for each Λ orbital. The mass number dependence of the Λ binding energies is, within the present experimental errors, consistent with a calculation based on the Woods-Saxon potential.
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