ossible halo structure of Ca-62,Ca-72 by forbidden-state-free locally peaked Gaussian

Autor(es)

Horiuchi, W. ^[1] ; Suzuki, Y. ^{[2, 3]} ; Shalchi, M. A. ^[4] ; Tomio, Lauro ^[4]

Afiliação do(s) autor(es)

^[1] Hokkaido Univ, Dept Phys, Sapporo, Hokkaido 0600810 - Japan

^[2] Niigata Univ, Dept Phys, Niigata 9502181 - Japan

^[3] RIKEN, Nishina Ctr, Wako, Saitama 3510198 - Japan

^[4] Univ Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW A; v. 105, n. 2 FEB 14 2022.
• Citações Web of Science: 0

Resumo

In order to efficiently describe nucleon orbits around a heavy core nucleus, we propose locally peaked Gaussians orthogonalized to the occupied bound states in the core. We show the advantage of those functions in both numerical stability and fast convergence by taking examples of touchstone calcium isotopes Ca-62,Ca-72 in Ca-60,Ca-70 +n + n three-body models. Both weakly bound configurations and continuum coupling effect are taken into account. We evaluate the neutron radii and the occupation probabilities of two-neutron configurations not only for the ground state but also for some particle-bound excited states by varying the strength of the core-neutron interaction. The emergence of the halo structure in the ground state depends on the energy difference between 2s(1/)(2 )and 0g(9/2) orbits. Two-neutron {[}consisting of (s(1/2))(2) configuration] and one-neutron {[}consisting of (g(9/2)s(1/2)) configuration] halo structures of Ca-62 can coexist in narrow energy spacing provided that both of 2s(1/)(2) and 0g(9/2) orbits are almost degenerate and barely bound. The ground-state structure of Ca-72 is likely to be a two-neutron halo, although its emergence depends on the position of the 2s(1/)(2) level. (AU)

• Processo FAPESP: 15/11828-5 - Métodos de poucos corpos aplicados a núcleos e condensados atômicos
• Beneficiário: Lauro Tomio
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional
• Processo FAPESP: 17/05660-0 - Estudos teóricos da estrutura e reações de núcleos exóticos e sistemas de muitos corpos
• Beneficiário: Brett Vern Carlson
• Modalidade de apoio: Auxílio à Pesquisa - Temático