In order to produce a neutron-rich Lambda hypernucleus for the first time, we carried out an experiment by utilizing the (pi-,K+) double charge-exchange reaction on a 10B target. We observed the production of a 10LambdaLi hypernucleus. The cross section for the Lambda bound region was found to be 11.3+/-1.9 nb/sr with the 1.2 GeV/c incident momentum, which is compared with the 10LambdaB hypernucleus production cross section, 7.8+/-0.3 microb/sr, in the (pi+,K+) reaction with a 1.05 GeV/c incident momentum beam.

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We studied theK-nucleus interaction by the 12 C(K − , N) reaction. Missing mass spectra were derived from the momenta of both neutrons and protons from the reaction. An appreciable strength was observed below theK-nucleus threshold, which indicates that thē K-nuclear potential is strongly attractive. The missing mass spectra are compared with the results of theoretical calculations. It is found that a potential depth of approximately −190 MeV best reproduces the spectrum of the 12 C(K − , n) reaction and approximately −160 MeV best reproduces that of the 12 C(K − , p) reaction. Our data show that theK-nucleus potential is sufficiently deep to realize kaon condensation in the core of neutron stars.

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