[en] The Jacobi shape transition from noncollective oblate to hyperdeformed collective prolate or triaxial shape in nuclei is analogous to the Jacobi shape instability occurring in gravitating rotating stars. This happens at a very high spin where pairing has vanished. Thermal fluctuations do not come into play because of near zero temperature in warm nuclei. Further, Jacobian instability occurs before fission instability in light and medium mass nuclei. In the present work, the theoretical approach of Nilsson-Strutinsky extended method for high spin have been followed