2012/07/26 by Kazunari Kaneko, K. Kaneko, T. Mizusaki +4
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Atomic physics #Coulomb #Electron #Energy (signal processing) #Geometry #Isospin #Nuclear physics #Nuclear physics research studies #Nucleon #Particle physics #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Shell (structure) #Symmetry (geometry) #Symmetry breaking #nucl-th
paper · pdf · doi:10.1103/physrevlett.109.092504
4 pages, 4 figures, accepted for publication in Physical Review Letters
arxiv created 2012/07/26 · openalex publication_date 2012/08/31 · arxiv updated 2015/06/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The anomaly in Coulomb energy differences (CEDs) between the isospin T=1 states in the odd-odd N=Z nucleus 70Br and the analogue states in its even-even partner 70Se has remained a puzzle. This is a direct manifestation of isospin-symmetry breaking in effective nuclear interactions. Here, we perform large-scale shell-model calculations for nuclei with A=66 to 78 using the new filter diagonalization method based on the Sakurai-Sugiura algorithm. The calculations reproduce well the experimental CED. The observed negative CED for A=70 are accounted for by the cross-shell neutron excitations from the fp shell to the g(9/2) intruder orbit with the enhanced electromagnetic spin-orbit contribution at this special nucleon number.