[en] The isovector giant dipole resonance (GDR) is an out-of-phase collective oscillation of proton and neutron fluids in the nucleus. The short lifetime of the GDR makes it an excellent probe to investigate the properties of the nucleus at high temperature (T) and angular momentum (J). The GDR energy is inversely related to the length of the axis along which the oscillation occurs and thus the GDR line shape provides the information regarding the shape and deformation of the nucleus. In summary, the high-energy γ-ray spectrum from the decay of GDR was measured for ³¹P at an excitation energy of 53 MeV, along with the evaporated neutrons and γ-ray multiplicity. The preliminary analysis shows the appearance of a deformed shape. The detailed statistical model analysis is in progress