Speaker
Description
In this presentation, I will expose some of the last developmentsin microscopic nuclear structure calculations for exotic nuclei far from stabilitity [1].
In a first part, I will expose recent study on the development of collectivity in neutron-rich nuclei around N=40, where recent experimental evidence suggest a rapid change from the spherical to rotational regime, in analogy to the island of inversion known at N=20 [2,3] and extension of the island of collectivity towards N=50 [4].
Our recent algebraic Nilsson SU3 self-consistent model will be used to describe the intruder relative evolution in the vicinity of 78Ni [5].
Then new theoretical calculations for the very region of 78Ni will be presented for the first time within the interacting shell
model framework using an enlarged model space outside a 60Ca core comprising pf shell for the protons and sdg
orbits for neutrons. Besides, the surprising spectrum of 78Ni, we predict development of deformation below 78Ni for iron and chromium isotopes, leading to the idea of merging islands of collectivity from N=40 to N=50, as already observed from N=20 to N=28 [2]. Core excitations and their impact on moments in Cu and Zn isotopic chains will be discussed.
Finally, discussion of the underlying mecanism in terms of Spin-Tensor components will be exposed and compared to other neutron-rich regions of the nuclear chart.
[1] F. Nowacki, A. Poves, Phys. Rev. Lett. in print
[2] E. Caurier, F. Nowacki, A. Poves, Phys. Rev. C 90, 014302 (2014)
[3] S. Lenzi et al., Phys. Rev. C 82, 054301 (2010)
[4] C. Santamaria et al., Phys. Rev. Lett. C 115, 192501 (2015)
[5] A. P. Zuker et al., Phys. Rev. C 92, 024320 (2015)
