Single-Particle Structure in Silicon Isotopes and the Collapse of the N=28 Shell Closure
- Ragnar Stroberg, MSU NSCL/Physics
Thursday, March 13, 11:00 AM - Research Discussion
NSCL Lecture Hall
A prominent theme in the study of the nuclear structure of exotic isotopes has been the disappearance of the shell closures found at stability and the appearance of new shell closures. The shell closure at N=28 is of particular interest because it is the first shell closure that arises due to the strong spin-orbit splitting which is responsible all higher shell closures. N=28 has been shown to disappear at large isospin, and this disappearance is particularly clear at 42Si (N=28,Z=14). This region is particularly difficult for shell model calculations with phenomenological interactions because they depend on cross-shell matrix elements which are poorly constrained by experimental data. Nonetheless, effective interactions have been developed which reproduce the collective observables around 42Si, while their microscopic predictions differ. In this talk, I will discuss the use of single-nucleon knockout reactions to investigate the disappearance of the N=28 shell gap from a single-particle perspective.