COULOMB DISINTEGRATION OF LI6 BY HEAVY NUCLEI. B-4,
YALE UNIV NEW HAVEN CONN
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The present paper is primarily a report on an attempt to ascertain the participation of Coulomb excitation in the observed disintegration of Li6 in its collisions with Au197. The ground state may probably be thought of in some sense as a configuration of a deuteron and an alpha particle in an l 0 state. This view is supported by the close agreement of the deuteron and Li6 magnetic moments. There seem to be three excited states of spin and parity 3, 2, 1, with primarily d, alpha structure, which play a role in d, alpha scattering. These may be members of an l 2 triplet, in which case one may expect electric quadrupole transitions to these three levels. The d, alpha model of the four states is not essential, however, for some of the considerations to be presented. Electric dipole transitions between d, alpha configurations are forbidden by the equal charge-to-mass ratios for the deuteron and alpha particle, and quite generally by the parity selection rule. One visualizes the electric disintegration taking place after Coulomb excitation of Li6, to the 3 level at 2.184 Mev, for example. This state then decays into an alpha particle and a deuteron, both of which closely follow the original hyperbolic orbit of the Li6, since the energy available in the d, alpha center of mass is 2.18 - 1.47 0.71 Mev, which is small compared with the incident lithium energy of 30 to 60 Mev.