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\documentstyle[11pt,apsab]{article} \nofiles \MeetingID{DNP04} %\DateSubmitted{20040621} \SubmittingMemberSurname{Zheng} \SubmittingMemberGivenName{Xiaochao} %\SubmittingMemberID{60057843} \SubmittingMemberEmail{xiaochao@jlab.org} \SubmittingMemberAffil{Argonne National Lab} \PresentationType{oral} \SortCategory{13e.}{}{}{} \begin{document} \Title{Measurement of the Double Polarization Asymmetry of $\Theta^+$ Production on the Neutron} \AuthorSurname{Zheng} \AuthorGivenName{Xiaochao} \thanks{mailing address: 12000 Jefferson Avenue, Newport News, VA 23606} %\AuthorEmail{xiaochao@jlab.org} \AuthorAffil{Argonne National Lab} E \begin{abstract} Recently several laboratories have reported experimental observations of an exotic $S=+1$ baryon (named the $\Theta+$) in exclusive photo-production from proton, deuteron and heavy targets. While it was suggested that its quark content is $uudd\bar s$ and is a member of the so called penta-quark family, most of its quantum numbers (parity, spin and isospin) have not been determined yet. We discuss here the possibility to study the spin and parity of the $\Theta^+$ via $\vec{n}(\vec{\gamma}, K^-~K^+n)$ reaction where a circularly polarized photon beam will be used and the polarized neutron is provided by a polarized $\vec{\mathrm{He}}$ target. A Letter-of-Intent was submitted to JLab PAC-25 to perform this measurement in Hall~A and a proposal is being planned. The theoretical basis will be discussed briefly and the experimental setup will be presented. This work is supported by the U.S. Department of Energy, Office of Nuclear Physics, under contract No.~W-31-109-ENG-38. \end{abstract} \end{document}