The land of deformation south of $^{68}$Ni - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2010

The land of deformation south of $^{68}$Ni

Alfredo Poves
  • Fonction : Auteur
  • PersonId : 1112566
Kamila Sieja

Résumé

We study the development of collectivity in the neutron-rich nuclei around $N=40$, where experimental and theoretical evidences suggest a rapid shape change from the spherical to the rotational regime, in analogy to what happens at the {\it island of inversion} surrounding $^{31}$Na. Theoretical calculations are performed within the interacting shell model framework in a large valence space, based on a $^{48}$Ca core which encompasses the full $pf$ shell for the protons and the $0f_{5/2}$, $1p_{3/2}$, $1p_{1/2}$, $0g_{9/2}$ and $1d_{5/2}$ orbits for the neutrons. The effective interaction is based on a G-matrix obtained from a realistic nucleon-nucleon potential whose monopole part is corrected empirically to produce effective single particle energies compatible with the experimental data. We find a good agreement between the theoretical results and the available experimental data. We predict the onset of deformation at different neutron numbers for the various isotopic chains. The maximum collectivity occurs in the chromium isotopes, where the large deformation regime starts already at $N=38$. The shell evolution responsible for the observed shape changes is discussed in detail, in parallel to the situation in the $N=20$ region.
Fichier principal
Vignette du fichier
sieja-n40.pdf (158.87 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00516494 , version 1 (09-09-2010)

Identifiants

Citer

Silvia Lenzi, Frédéric Nowacki, Alfredo Poves, Kamila Sieja. The land of deformation south of $^{68}$Ni. 2010. ⟨hal-00516494⟩
52 Consultations
57 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More