Nuclear Seminar

Dominance of low spin & high deformation in ab initio approaches to the structure of light nuclei

Tomas Dytrych
Louisiana State University

Monday, November 16, 2009   1:00 p.m.   NSH 124
(Refreshments served prior to seminar in NSH 124)

Ab initio no-core shell-model solutions for the structure of light nuclei are shown to be dominated by low-spin and high-deformation configurations. This implies that only a small fraction of the full model space is important for a description of bound-state properties of light nuclei. It further points to the fact that the coupling scheme of choice for carrying out calculations for light nuclear systems is an algebraic-based, no-core shell-model scheme that isbuilt upon an LS coupling [SO(3) SU(2)] foundation with the spatial part of the model space further organized into its symplectic structure. Results for 12C and 16O are presented with the cluster nature of the excited 0+ states in 16O analyzed within this framework. The results of the analysis encourage the development of a no-core shell model code that takes advantage of algebraic methods as well as modern computational techniques. Indeed, although it is often a very challenging task to cast complex algebraic constructs into simple logical ones that execute efficiently on modern computational systems, the construction of such a next-generation code is currently underway.

*Note different time