# Surface tension of compressed, superheavy atoms

## TL;DR

This study models the surface properties of hypothetical superheavy atoms with nuclear cores around 10^4 in mass, revealing significant electromagnetic and electron effects on their structure and stability.

## Contribution

It introduces a relativistic mean field and Thomas-Fermi based model for compressed superheavy atoms, analyzing their surface tension and Coulomb energy with novel numerical insights.

## Key findings

- Electromagnetic interactions significantly influence surface tension.
- Electrons penetrate the nuclear core affecting stability.
- Possible existence of stable compressed superheavy atoms.

## Abstract

Based on the relativistic mean field theory and the Thomas-Fermi approximation, we study the surface properties of compressed, superheavy atoms. By compressed, superheavy atom we mean an atom composed by a superheavy nuclear core (superheavy nucleus) with mass number of the order of $10^4$, and degenerate electrons that neutralize the system. Some electrons penetrate into the superheavy nuclear core and the rest surround it up to a distance that depends upon the compression level. Taking into account the strong, weak, and electromagnetic interactions, we numerically study the structure of compressed, superheavy atoms and calculate the nuclear surface tension and Coulomb energy. We analyze the influence of the electron component and the background matter on the nuclear surface tension and Coulomb energy of compressed, superheavy atoms. We also compare and contrast these results in the case of compressed, superheavy atoms with phenomenological results in nuclear physics and the results of the core-crust interface of neutron stars with global charge neutrality. Based on the numerical results we study the instability against Bohr-Wheeler surface deformations in the case of compressed, superheavy atoms. The results in this article show the possibility of the existence of such compressed, superheavy atoms, and provide the evidence of strong effects of the electromagnetic interaction and electrons on the structure of compressed, superheavy atoms.