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)

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... ction 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.