Shape coexistence in nuclei occurs because the quadrupole-quadrupole correlations are extremely strong therein. At the neutron rich side, they can even make some semi-magic nuclei deformed in their ground states, leading to the so called Islands of Inversion. I will visit these islands and describe them with the Spherical Shell Model with (large scale) Configuration Mixing, guided by the SU(3) heuristics. The tour will finish in doubly magic 78Ni and the fifth Island of Inversion. An intriguing point is whether the shape parameters in the intrinsic frame, beta and gamma, survive in the laboratory frame. Using the Kumar invariants up to sixth order, we have computed exactly the variances of beta and gamma. They tell us that beta can be rather soft and gamma meaningless. In addition, it turns out that whereas the notion of deformed nucleus still makes sense in many cases, the notion of spherical nucleus never does.
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2019-11-27T11:00:002019-11-27T12:00:00Shape Coexistence in NucleiEvent Information:
Shape coexistence in nuclei occurs because the quadrupole-quadrupole correlations are extremely strong therein. At the neutron rich side, they can even make some semi-magic nuclei deformed in their ground states, leading to the so called Islands of Inversion. I will visit these islands and describe them with the Spherical Shell Model with (large scale) Configuration Mixing, guided by the SU(3) heuristics. The tour will finish in doubly magic 78Ni and the fifth Island of Inversion. An intriguing point is whether the shape parameters in the intrinsic frame, beta and gamma, survive in the laboratory frame. Using the Kumar invariants up to sixth order, we have computed exactly the variances of beta and gamma. They tell us that beta can be rather soft and gamma meaningless. In addition, it turns out that whereas the notion of deformed nucleus still makes sense in many cases, the notion of spherical nucleus never does.Event Location:
TRIUMF Auditorium