Ab initio symmetry-adapted emulator for studying emergent collectivity and clustering in nuclei

0571102 - ÚJF 2024 RIV CH eng J - Journal Article
Becker, K. S. - Launey, K. D. - Ekström, A. - Dytrych, Tomáš
Ab initio symmetry-adapted emulator for studying emergent collectivity and clustering in nuclei.
Frontiers in Physics. Roč. 11, MAR (2023), č. článku 1064601. ISSN 2296-424X. E-ISSN 2296-424X
R&D Projects: GA ČR(CZ) GA22-14497S
Institutional support: RVO:61389005
Keywords : ab initio symmetry-adapted no-core shell model * nuclear collectivity * nuclear clustering * eigenvector continuation * emulators * Li-6 * C-12
OECD category: Particles and field physics
Impact factor: 3.1, year: 2022
Method of publishing: Open access
https://doi.org/10.3389/fphy.2023.1064601

We discuss emulators from the ab initio symmetry-adapted no-core shell-model framework for studying the formation of alpha clustering and collective properties without effective charges. We present a new type of an emulator, one that utilizes the eigenvector continuation technique but is based on the use of symplectic symmetry considerations. This is achieved by using physically relevant degrees of freedom, namely, the symmetry-adapted basis, which exploits the almost perfect symplectic symmetry in nuclei. Specifically, we study excitation energies, point-proton root-mean-square radii, along with electric quadrupole moments and transitions for Li-6 and C-12. We show that the set of parameterizations of the chiral potential used to train the emulators has no significant effect on predictions of dominant nuclear features, such as shape and the associated symplectic symmetry, along with cluster formation, but slightly varies details that affect collective quadrupole moments, asymptotic normalization coefficients, and alpha partial widths up to a factor of two. This makes these types of emulators important for further constraining the nuclear force for high-precision nuclear structure and reaction observables.
Permanent Link: https://hdl.handle.net/11104/0342403