Scaling dynamics and universality of fission-gas-bubble growth in amorphous systems

ABSTRACT

We present a generalised approach for describing the universal dynamics and statistical properties of fission gas bubble growth in amorphous systems, using ${\mathrm{U}}_3{\mathrm{S}\mathrm{i}}_2$ as an example. We examine the scaling properties of both the growth and coalescence regimes of bubble growth, and find that the scaling exponents in these regimes are controlled by the fission rate and temperature. The nucleation regime is characterised by a growth exponent close to 1/2, while the coalescence regime is characterised by a growth exponent around 1/3. We show that the statistical distribution over bubble size is of a universal character. Analytical results are verified by numerical simulations and clarified with experimental data. This study provides insight into the kinetics of fission gas bubble growth in amorphous systems.

KEYWORDS:

• Neutron irradiation
• gas bubbles
• scaling properties
• universality

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data Availability Statement

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

Additional information

Funding

This work is supported by Sichuan Science and Technology Program [grant number 2022JDGD0040].