RESUMEN
A measurement of the reduced transition probability for the excitation of the ground state to the first 2+ state in 104Sn has been performed using relativistic Coulomb excitation at GSI. 104Sn is the lightest isotope in the Sn chain for which this quantity has been measured. The result is a key point in the discussion of the evolution of nuclear structure in the proximity of the doubly magic nucleus 100Sn. The value B(E2; 0+ â 2+) = 0.10(4) e2b2 is significantly lower than earlier results for 106Sn and heavier isotopes. The result is well reproduced by shell model predictions and therefore indicates a robust N = Z = 50 shell closure.
RESUMEN
Contractures in cerebral palsy (CP) are usually in flexion at the hips and knees, and in plantar flexion at the ankles. When correctly indicated, surgical release is appropriate. Occasionally, extension contractures of the hip and knee develop, and dorsiflexion contractures of the ankle may ensue. In CP, the management of each of these deformities may require different sets of operative procedures.