2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27055Finite-Size-Scaling and Conformal Invariance are used in order to find the phase diagram and critical exponents of a quantum spin chain with spin $S=3/2$. The model has a tetracritical point besides critical lines. The conformal anomaly and anomalous dimensions of some primary operators are calculated at the tetracritical point.12 pages, 1figure(by reques), UFSCARF-TH-3, plain latexCondensed Mattertext