2023/05/26 by Mario Gattobigio, Gattobigio, Mario, A. Kievsky +1
Physics and Astronomy · #Atomic and Molecular Clusters (physics.atm-clus) #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #Nuclear Theory (nucl-th) #Quantum, superfluid, helium dynamics
paper · pdf · doi:10.48550/arxiv.2305.16814
openalex publication_date 2023/05/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate the properties of the excited state of 4He, 4He^*, within the framework of Efimov physics and its connection to the unitary point of the nuclear interaction. We explore two different approaches to track the trajectory of 4He^* as it crosses the 3H+p threshold and potentially becomes a resonant state. The first approach involves an analytical continuation of the energy with respect to the Coulomb coupling, while the second approach introduces an artificial four-body force that it is gradually released. By utilizing Padé approximants and extrapolation techniques, we estimate the energy and width of the resonance. Our results suggest a central energy value of ER=0.060(3) MeV and a width of Γ/2=0.036(6) MeV using the Coulomb analysis, and ER=0.068(1) MeV and Γ/2=0.007(5) MeV with the four-body force analysis. Interestingly, these results are consistent with calculations based on \it ab-initio nuclear interactions but differ from the accepted values of the 0+ resonance energy and width. This highlights the challenges in accurately determining the properties of resonant states in light nuclei and calls for further investigations and refinements in theoretical approaches.