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A collective Hamiltonian is derived by using the local Gaussian overlap approximation in the generator coordinate method. Three Euler angles {)) (B¢

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It is shown that, although s-wave neutron resonance is ruled out in a conventional form of nuclear potential, the polarization of the deformed core nucleus can produce 1/2+ resonance. Using the coupled-channel method, we obtain this result concerning the 1/2+ state of 9Be. The state may be one example of the resonances suggested by the optical potential theory of Feshbach. n/2. This peak is out of the usual conception of the resonance. 1 l (ii) Anti-resonsnce. 7 l The phase shift crosses n/2 downwards. The peak of at University of Massachusetts Medical School on April 5, 2015 http://ptp.oxfordjournals.org/ Downloaded from S-Wave Neutron Resonancethe 1/2+ state should be called "anti-resonance". (iii) Anomaly of the three-body break-up effect of the 9 Be system. 8 > (iv) Shell model and alpha cluster model calculation. 9 >

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