DOE OSTI · 2406797
Suppressed electric quadrupole collectivity in 49 Ti
Abstract
Single-step Coulomb excitation of 46,48,49,50 Ti is presented. A complete set of E2 matrix elements for the quintuplet of states in 49 Ti, centred on the core excitation, was measured for the first time. A total of nine E2 matrix elements are reported, four of which were previously unknown. $^{49}_{22}$Ti 27 shows a 20% quenching in electric quadrupole transition strength as compared to its semi-magic $^{50}_{22}$Ti 28 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 49 Ti- 50 Ti pair (i.e., approximate single-j 0 7/2 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.
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Gray, T. J., Allmond, J. M., Benetti, C., Wibisono, C., Baby, L., Gargano, A., Miyagi, T., Macchiavelli, A. O., Stuchbery, A. E., Wood, J. L., Ajayi, S., Aragon, J., Asher, B. W., Barber, P., Bhattacharya, S., Boisseau, R., Christie, J. M., Conley, A. L., De Rosa, P., Dowling, D. T., Esparza, C., Gibbons, J., Hanselman, K., Holt, J. D., Lopez-Caceres, S., Lopez Saavedra, E., McCann, G. W., Morelock, A., Kelly, B., King, T. T., Rasco, B. C., Sitaraman, V., Tabor, S. L., Temanson, E., Tripathi, V., Wiedenhöver, I., Yadav, R. B.. 2024-08-01. Suppressed electric quadrupole collectivity in 49 Ti. https://doi.org/10.1016/j.physletb.2024.138856
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