The Role of the N-P Interaction in Microscopic Calculations of Collective Motion
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 Behavior Microscopic Calculation Interact Boson Mode12 Neutron State Intrinsic Quadrupole Moment
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