Nuclear triaxial

Division 2 stress analysis considers all stresses in a triaxial state combined in acc-ordance with the maximum shear stress theory. Division 1 and the procedures outlined in this bcx)k c-onsider a biaxial state of stress combined in accordance with the maximum stress theory. Just as you would not design a nuclear reactor to the rules of Division 1, you would not design an air receiver by the techniques of Division 2. Each has its place and applications. The following discussion on categories of stress and allowables will utilize information from Dicision 2, which can be applied in general to all vessels. 

The experimental data and nuclear shape calculations convincingly show that the well-deformed nuclei have axial symmetry at low and moderate angular momenta. At the same time in a wider neutron number region N = 84—120), departures were observed from axial symmetry in several Nd, Sm, Gd, Pt, and other nuclei. An analysis performed by Casten (2000) shows that the lack of axial symmetry is associated rather with y-softness than with stable triaxial deformation. 

As hinted above, a comparable systematics of giant resonance splittings cannot be produced for nuclei because too many of them are so soft that the signal is smeared out, as is the case for the few triaxially soft clusters in the sample of Figure 7.4. One thus tries to retrieve the information on nuclear deformation from the amplitude of the low-energy quadrupole modes which is closely related to the transition strength, often called the B(E2) value [65]. This access has been used in [5] for the systematic comparison of cluster and nuclear deformation. 

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