2020/04/30 by X. Mao, J. Rotureau, W. Nazarewicz +4
Mathematics · Physics and Astronomy · #Advanced Chemical Physics Studies #Atomic and Molecular Physics #Atomic physics #Binding energy #Density matrix renormalization group #Hamiltonian (control theory) #Mathematics #Neutron #Nuclear drip line #Nuclear physics research studies #Nuclear shell model #Nuclear structure #Nucleon #Physics #Quantum mechanics #Renormalization #Renormalization group #SHELL model #Scaling #Spectral line #nucl-th
paper · pdf · doi:10.1103/physrevc.102.024309
published as Phys. Rev. C 102, 024309 (2020) · 11 pages, 3 figures
arxiv created 2020/07/17 · openalex publication_date 2020/08/07 · arxiv updated 2020/08/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Background: Weakly bound and unbound nuclei close to particle drip lines are laboratories of new nuclear structure physics at the extremes of neutron/proton excess. The comprehensive description of these systems requires an open quantum system framework that is capable of treating resonant and nonresonant many-body states on equal footing.Purpose: In this work, we develop the complex-energy configuration interaction approach to describe binding energies and spectra of selected 5\ensuremath≤A\ensuremath≤11 nuclei.Method: We employ the complex-energy Gamow shell model (GSM) assuming a rigid 4He core. The effective Hamiltonian, consisting of a core-nucleon Woods-Saxon potential and a simplified version of the Furutani-Horiuchi-Tamagaki interaction with the mass-dependent scaling, is optimized in the sp space. To diagonalize the Hamiltonian matrix, we employ the Davidson method and the Density Matrix Renormalization Group technique.Results: Our optimized GSM Hamiltonian offers a good reproduction of binding energies and spectra with the root-mean-square (rms) deviation from experiment of 160 keV. Since the model performs well when used to predict known excitations that have not been included in the fit, it can serve as a reliable tool to describe poorly known states. A case in point is our prediction for the pair of unbound mirror nuclei 10Li\text\ensuremath-10N in which a huge Thomas-Ehrman shift dramatically alters the pattern of low-energy excitations.Conclusion: The new model will enable comprehensive studies of structure and reactions aspects of light drip-line nuclei.