2025/09/22 by E. Garrido, Garrido, E., A. S. Jensen +1
Earth and Planetary Sciences · Environmental Science · Physics and Astronomy · #Astro and Planetary Science #FOS: Physical sciences #Geophysics and Gravity Measurements #Methane Hydrates and Related Phenomena #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #nucl-ex #nucl-th
paper · pdf · doi:10.48550/arxiv.2509.17908
published as J. Phys. G: Nucl. Part. Phys. 52 105101 (2025) · To be published in Journal of Physics G: Nuclear and Particle Physics
arxiv created 2025/09/22 · openalex publication_date 2025/09/22 · openalex created_date 2025/10/17 · openalex updated_date 2026/07/28 · arxiv updated 2026/08/03
The hyper-radial barrier strongly hinders formation of more than three clusters. We investigate how well the dominating cluster components in 7He and 8He, respectively can be described as α+n+2n and α+2n+2n, where 2n is the dineutron. Effective interactions compatible with 5He and 6He are used. We vary the lesser known n-2n and 2n-2n interactions, where very small strengths are required. We provide energies, radii, and partial wave decomposition of all computed, predicted or measured, ground and resonance states. We predict substructures within each of the three-body quantum states. We also calculate the neutron-structure sensitive invariant mass spectrum of the four-nucleon system, after fast removal of the α-particle from 8He. We show that all available experimental information are fairly well reproduced. Very little room is left for variation of the effective interaction parameters. Thus, the dominating features of the subsequently derived reaction and structure properties are well supported.