Nucleon internal degrees of freedom and the uniqueness of the Gamow-Teller state

TL;DR

This paper investigates how nucleon internal degrees of freedom uniquely influence Gamow-Teller strength in nuclei, showing that nucleon excitations cause a consistent quenching effect across different nuclei.

Contribution

It demonstrates that the quenching of Gamow-Teller strength is primarily due to nucleon internal excitations, a feature not shared by other excitation modes involving spatial degrees of freedom.

Findings

Gamow-Teller strength is quenched by 30-40% in all nuclei.

Internal nucleon degrees of freedom uniquely affect Gamow-Teller states.

Spatial excitation modes are less influenced by nucleon internal excitations.

Abstract

The Gamow-Teller strength in nuclei can be strongly affected by the internal degrees of freedom of the nucleon. It is demonstrated that this feature is unique to the Gamow-Teller. Excitation modes that involve spatial degrees of freedom are much less influenced by the internal excitation of nucleons. The fact that the observed Gamow-Teller strength is quenched by 30-40 percent in all nuclei suggests that indeed this is due to the nucleon excitation in nuclei.