Skip to Main content Skip to Navigation
Preprints, Working Papers, ...

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

Abstract : 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.
Document type :
Preprints, Working Papers, ...
Complete list of metadata

Cited literature [13 references]  Display  Hide  Download
Contributor : Frédéric Nowacki Connect in order to contact the contributor
Submitted on : Thursday, September 9, 2010 - 6:06:11 PM
Last modification on : Monday, October 11, 2021 - 6:02:09 PM
Long-term archiving on: : Thursday, June 30, 2011 - 1:26:10 PM


Files produced by the author(s)


  • HAL Id : hal-00516494, version 1
  • ARXIV : 1009.1846



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



Record views


Files downloads