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The exotic baryon $\Theta^+(uudd\bar{s})$ is studied with microscopiccalculations in a quark model by using a method of antisymmetrized moleculardynamics. We predict that the lowest even state is $J^\pi=1/2^+(I=0)$ or$J^\pi=3/2^+(I=0)$, and the lowest odd state is $J^\pi=3/2^-(I=1)$. They nearlydegenerate in the $uudd\bar{s}$ system. We discuss $K^+n$ decay widths andestimate them to be $\Gamma< 7$ for the $J^\pi=\{1/2^+,3/2^+\}$, and $\Gamma<1$MeV for the $J^\pi=3/2^-$ state.Comment: 6 pages, 2 figures, submitted to Phys. Rev.

physical review. c. nuclear physics/physical review. c, nuclear physics

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