Suppressed Electric Quadrupole Collectivity in $^{49}$Ti
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | 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. Saavedra, E. Lopez 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. |
| author_facet | 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. Saavedra, E. Lopez 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. |
| contents | 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, 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. $^{49}_{22}$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-$j$ $0f_{7/2}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_03503 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Suppressed Electric Quadrupole Collectivity in $^{49}$Ti 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. Saavedra, E. Lopez 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. Nuclear Experiment Nuclear Theory 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, 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. $^{49}_{22}$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-$j$ $0f_{7/2}$ 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. |
| title | Suppressed Electric Quadrupole Collectivity in $^{49}$Ti |
| topic | Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2407.03503 |