Suppressed electric quadrupole collectivity in 49Ti

T. J. Gray, J. M. Allmond, C. Benetti, C. Wibisono, L. Baby, A. Gargano, T. Miyagi, A. O. Macchiavelli, A. E. Stuchbery, J. L. Wood, S. Ajayi, J. Aragon, B. W. Asher, P. Barber, S. Bhattacharya, R. Boisseau, J. M. Christie, A. L. Conley, P. De Rosa, D. T. DowlingC. Esparza, J. Gibbons, K. Hanselman, J. D. Holt, S. Lopez-Caceres, E. Lopez Saavedra, G. W. McCann, A. Morelock, B. Kelly, T. T. King, B. C. Rasco, V. Sitaraman, S. L. Tabor, E. Temanson, V. Tripathi, I. Wiedenhöver, R. B. Yadav

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Abstract

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, centred 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. 2249Ti27 shows a 20% quenching in electric quadrupole transition strength as compared to its semi-magic 2250Ti28 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.

Original languageEnglish
Article number138856
JournalPhysics Letters B
Volume855
DOIs
StatePublished - Aug 2024

Funding

We would like to acknowledge the Center for Accelerator Target Science (CATS) and Matt Gott for making the C and Al foils used in this study and Alfredo Poves for useful discussions on the Shell-Model calculations. This material is based upon work supported in part by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Contract No. DE-AC05-00OR22725 (ORNL). This work was also supported by the U.S. National Science Foundation under Grant No. PHY-2012522 (FSU) and the Australian Research Council under grant No. DP210101201. In addition, this work was supported in part by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) \u2014 Project-ID 279384907 \u2014 SFB 1245, and the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 101020842). The VS-IMSRG calculations were supported by NSERC under grants SAPIN-2018-00027 and RGPAS-2018-522453 and the Arthur B. McDonald Canadian Astroparticle Physics Research Institute. Calculations were performed with an allocation of computing resources at the J\u00FClich Supercomputing Center and Cedar at WestGrid with The Digital Research Alliance of Canada. The publisher acknowledges the US government license to provide public access under the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).

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