Variation of Tensor Force due to Nuclear Medium Effect

TL;DR

This paper investigates how the tensor force in nuclei varies due to the nuclear medium effect, highlighting an observed enhancement in specific excited states of $^{6}$Li related to isospin and medium influence.

Contribution

It provides the first observation of tensor force enhancement in the $^{6}$Li nucleus and proposes a mechanism involving the nuclear medium's role on isospin states.

Findings

Enhanced $J^{ u}(T)$=3$^{+}$(0) state observed

Equal excitation strength for $J^{ u}(T)$=0$^{+}$(1) states

Nuclear medium significantly affects tensor force effects

Abstract

The enhancement of $J^{\pi}(T)$=3$^{+}$(0) state with isospin $T=0$ excited by the tensor force in the free $^{6}$Li nucleus has been observed, for the first time, relative to a shrinkable excitation in the $^{6}$Li cluster component inside its host nucleus. Comparatively, the excitation of $J^{\pi}(T)$=0$^{+}$(1) state with isospin $T=1$ for these two $^{6}$Li formations take on an approximately equal excitation strength. The mechanism of such tensor force effect was proposed due to the intensive nuclear medium role on isospin $T$=0 state.