2024/07/03 by T. J. Gray, Gray, T. J., J. M. Allmond +71 · 1 citation
Engineering · Physics and Astronomy · #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Nuclear physics research studies #Superconducting Materials and Applications #Superconductivity in MgB2 and Alloys
paper · pdf · doi:10.48550/arxiv.2407.03503
openalex publication_date 2024/07/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/03
Single-step Coulomb excitation of 46,48,49,50Ti is presented. A complete set of E2 matrix elements for the quintuplet of states in 49Ti, centered on the 2+ core excitation, was measured for the first time. A total of nine E2 matrix elements are reported, four of which were previously unknown. 4922Ti27 shows a 20% quenching in electric quadrupole transition strength as compared to its semi-magic 5022Ti28 neighbour. This 20% quenching, while empirically unprecedented, can be explained with a remarkably simple two-state mixing model, which is also consistent with other ground-state properties such as the magnetic dipole moment and electric quadrupole moment. A connection to nucleon transfer data and the quenching of single-particle strength is also demonstrated. The simplicity of the 49Ti-50Ti pair (i.e., approximate single-j 0f7/2 valence space and isolation of yrast states from non-yrast states) provides a unique opportunity to disentangle otherwise competing effects in the ground-state properties of atomic nuclei, the emergence of collectivity, and the role of proton-neutron interactions.