Evaluation of the Moments of Inertia of Forced Split Fragments for Nuclei 232Th(n,f) and 238U(n,f)

TL;DR

This paper evaluates methods for estimating the moments of inertia of nuclear fragments from the fission of 232Th and 238U, comparing statistical and microscopic approaches within classical and superfluid models to improve understanding of nuclear dynamics.

Contribution

It introduces a detailed comparison of statistical and microscopic methods for calculating moments of inertia in nuclear fission, incorporating effects of vibrational modes and nucleon exchange.

Findings

Significant impact of vibrational modes on spin distributions.

Validation of models through comparison with experimental data.

Identification of regularities in nuclear structure related to fragment deformation.

Abstract

This paper discusses modern methods for estimating the moments of inertia of fragments formed during forced fission of the isotopes 232Th(n,f) and 238U(n,f). The study analyzes two fundamental approaches -- statistical and microscopic. Special attention is given to their implementation within both classical and superfluid models, enabling a more detailed description of nuclear dynamics during fission. Various physical factors influencing the calculation of moments of inertia are examined, including transverse vibrational modes and nucleon exchange mechanisms. These effects significantly impact spin distributions and the interpretation of experimental data. The analysis also addresses the role of nuclear models that vary with fragment deformation, allowing key regularities in internal structure to be identified. Emphasis is placed on comparing theoretical predictions with experimental results, which remain essential for model validation. This approach not only deepens understanding of fission mechanisms but also supports the broader study of fundamental nuclear properties.