The branching ratios of K^- absorption at rest in nuclear matter areevaluated from the K^- self-energy by using the chiral unitary approach for thes-wave ar{K} N amplitude. We find that both the mesonic and non-mesonicabsorption potentials are dominated by the Lambda(1405) contributions. We alsoobserve that the mesonic absorption ratio [pi ^{-} Sigma ^{+}] / [pi ^{+}Sigma ^{-}] increases as a function of nuclear density due to the interferencebetween Lambda(1405) and the I=1 non-resonant background, which is consistentwith experimental results. The fraction of the non-mesonic absorption isevaluated to be about 30 % at the saturation density. The branching ratios ofthe K^- absorption at rest into deuteron and 4He are also calculated.
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