The Role of the N-P Interaction in Microscopic Calculations of Collective Motion

Abstract

A topic of longstanding interest in nuclear structure theory has been the microscopic theory of collective nuclear behavior. There is now a large body of evidence that nuclear shell-model calculations1 can reproduce rotational behavior which is observed in light nuclei, particularly in the sd shell. In the last few years, there has been great interest in the so-called interacting boson model2 (IBM), which has been able to describe both rotational and vibrational behavior in medium and heavy nuclei,. As I’ll discuss further below, the IBM is a truncation scheme for shell-model calculations. An intrinsic assumption of the model is that the shell model is capable of describing observed collective phenomena. One question then is what are the key ingredients in a shell-model calculation which lead to rotational features? There have been several papers3–7 in recent years on this question, and in most of them, it is suggested that the neutron-proton interaction plays a decisive role in shell-model descriptions of rotational behavior. It is the purpose of this talk to summarize these arguments on the importance of n-p interaction.KeywordsRotational BehaviorMicroscopic CalculationInteract Boson Mode12Neutron StateIntrinsic Quadrupole MomentThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.