2004/10/27 by G. Hagen, M. Hjorth-Jensen, M. Hjorth‐Jensen +1 · 3 citations
Chemistry · Mathematics · Physics and Astronomy · #Advanced NMR Techniques and Applications #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #math-ph #math.MP #nucl-th #physics.atom-ph
paper · pdf · doi:10.1103/physrevc.71.044314
published as Phys.Rev. C71 (2005) 044314 · 18 pages, 17 figs, Revtex4
arxiv created 2004/10/27 · openalex publication_date 2005/04/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We apply a contour deformation technique in momentum space to the newly developed Gamow shell model, using the drip-line nuclei 5He, 6He, and 7He as test cases. A major problem in Gamow shell-model studies of nuclear many-body systems is the increasing number of many-body configurations due to the large number of resonant and complex-continuum single-particle orbits necessary to reproduce multiparticle bound and resonant states. We address this problem using two different effective operator approaches generalized to the complex momentum plane. These are the Lee-Suzuki similarity transformation method for complex interactions and the multireference perturbation theory method. We show that a combination of these two approaches results in a drastic truncation of the number of relevant configurations compared with direct diagonalization. This offers interesting perspectives for studies of weakly bound systems.