Bubble $^{36}$Ar and Its New Breathing Modes

TL;DR

This paper investigates bubble structures in the nucleus of argon-36 using an extended quantum molecular dynamics model, revealing new density modes and linking quantum nuclear oscillations to classical bubble dynamics.

Contribution

It uncovers three novel density distribution modes in bubble nuclei and establishes a connection between quantum oscillations and classical bubble behavior.

Findings

Identified micro-bubble, bubble, and cluster resonance modes.

Discovered the spectral signatures of these modes.

Linked bubble oscillation frequencies to classical bubble dynamics.

Abstract

The bubble nuclei are important components of exotic nuclear structures characterized by special depletions of central densities. Focusing on bubble structures of $^{36}$Ar, the characterizations of bubble nuclei were explored with the framework of the extended quantum molecular dynamics model. Three density distribution modes were uncovered for the first time, i.e. micro-bubble, bubble, and cluster resonances, which show unique spectral signature compared to the monopole resonance spectrum as the excitation intensity was increased in bubbles. Of pivotal importance is the revelation that the bubble mode's oscillation frequency closely resembles macroscopic bubble dynamics, building a connection between classical macroscopic phenomena and the quantum complexity of the nuclear structure. The discovery marks a crucial step forward in deciphering the relationship between classical and quantum domains within the enigmatic world of atomic nuclei.