Total angular momentum distributions of fission fragments at scission in a 2-center basis
Abstract
In this article, we propose a new method to calculate the angular momentum distribution of fis- sion fragments adapted to the case of 2-center axial basis used to solve the Hartree-Fock-Bogoliubov equations in view of fission studies. As a first application, we have studied the properties of the fission fragment angular momentum distribution in the scission area of 240Pu using the Gogny D1S interaction. Here, a one dimensional asymmetric and adiabatic path (the lowest in energy), gener- ated by the newly proposed Link and Drop methods, has been considered. The major result of this study is the appearance of an odd-even angular momentum staggering in both fragments when going through scission. The odd-J components are progressively suppressed as the fragments separate, leading to an increasing dominance of even-J components. This behavior is systematically correlated with the rapid reduction of the intrinsic octupole deformation of the fragments, asso- ciated with the restoration of a more nearly reflection-symmetric shape. Finally, particle-number projection reveals the role of shell effects associated with specific fragment configurations in shaping the fragment angular momentum distributions.
Related
- Microscopic Spin-Parity Distributions of Fission Fragments
- Energy-Resolved Spin and Parity Distributions of Fission Fragments
- Insights into the Angular Momentum of Compound Nuclei Populated in Fragmentation-Induced Fission Reactions of 238U
- Proton GTMDs and Wigner Distributions in the Chiral Quark Soliton Model: Orbital Angular Momentum and Spin-Orbit Correlation with Sea Quarks
- Probing Orbital Angular Momentum Distributions in Elastic Vector Meson Production in Longitudinally Polarized Electron--Proton Scattering
BibTeX
@misc{carpentier2026total,
title = {{Total angular momentum distributions of fission fragments at scission in a 2-center basis}},
author = {Paul Carpentier and Nathalie Pillet and Pablo Nieto-Gallego},
howpublished = {HAL},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.03270},
eprint = {2610.03270},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05835120v1},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Total angular momentum distributions of fission fragments at scission in a 2-center basis
AU - Paul Carpentier
AU - Nathalie Pillet
AU - Pablo Nieto-Gallego
PY - 2026
DA - 2026/10/02
PB - HAL
DO - 10.48550/arxiv.2610.03270
UR - https://hal.science/hal-05835120v1
AB - In this article, we propose a new method to calculate the angular momentum distribution of fis- sion fragments adapted to the case of 2-center axial basis used to solve the Hartree-Fock-Bogoliubov equations in view of fission studies. As a first application, we have studied the properties of the fission fragment angular momentum distribution in the scission area of 240Pu using the Gogny D1S interaction. Here, a one dimensional asymmetric and adiabatic path (the lowest in energy), gener- ated by the newly proposed Link and Drop methods, has been considered. The major result of this study is the appearance of an odd-even angular momentum staggering in both fragments when going through scission. The odd-J components are progressively suppressed as the fragments separate, leading to an increasing dominance of even-J components. This behavior is systematically correlated with the rapid reduction of the intrinsic octupole deformation of the fragments, asso- ciated with the restoration of a more nearly reflection-symmetric shape. Finally, particle-number projection reveals the role of shell effects associated with specific fragment configurations in shaping the fragment angular momentum distributions.
ER -