ZhETF, Vol. 126,
p. 907 (October 2004)
(English translation - JETP,
Vol. 99, No. 4,
available online at www.springer.com
ULTRARELATIVISTIC NUCLEI IN A CRYSTAL CHANNEL: COULOMB SCATTERING, COHERENCE, AND ABSORPTION
Received: May 12, 2004
We incorporate the effect of lattice thermal vibrations into the Glauber-theory description of particle and nucleus-crystal Coulomb interactions at high energy. We show that taking the lattice thermal vibrations into account produces a strong absorption effect: the phase shift function of the multiple-diffraction scattering on a chain of N identical atoms acquires a large imaginary part and the radius of the absorption region in the impact parameter plane grows logarithmically with N. Consequences of this observation for the elastic and quasielastic Coulomb scattering are discussed. The practically interesting example of the coherent Coulomb excitation of ultrarelativistic particles and nuclei passing through a crystal is considered in detail.