• [1]

    A. Bohr and B. R. Mottelson, Phys. Scrfipta, 10A(1974), 3.[2] G. Ander3on et al., Nucl Phys., A268(1976), 205.[3] T. Dossing et al., Phys. Rev. Lett., 39(1977), 1395.[4] J. Pederson et al., Phys. Rev, Lett., 39(1677), 990.