Shape polarization in the tin isotopes near $N=60$ from precision $g$-factor measurements on short-lived $11/2^-$ isomers
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| author | Gray, T. J. Stuchbery, A. E. Dobaczewski, J. Blazhev, A. Alshammari, H. A. Bignell, L. J. Bonnard, J. Coombes, B. J. Dowie, J. T. H. Gerathy, M. S. M. Kibédi, T. Lane, G. J. McCormick, B. P. Mitchell, A. J. Nicholls, C. Pope, J. G. Reinhard, P. -G. Spinks, N. J. Zhong, Y. |
| author_facet | Gray, T. J. Stuchbery, A. E. Dobaczewski, J. Blazhev, A. Alshammari, H. A. Bignell, L. J. Bonnard, J. Coombes, B. J. Dowie, J. T. H. Gerathy, M. S. M. Kibédi, T. Lane, G. J. McCormick, B. P. Mitchell, A. J. Nicholls, C. Pope, J. G. Reinhard, P. -G. Spinks, N. J. Zhong, Y. |
| contents | The $g$ factors of $11/2^-$ isomers in semimagic $^{109}$Sn and $^{111}$Sn (isomeric lifetimes $τ= 2.9(3)$ ns and $τ= 14.4(7)$ ns, respectively) were measured by an extension of the Time Differential Perturbed Angular Distribution technique, which uses \LaBr detectors and the hyperfine fields of a gadolinium host to achieve precise measurements in a new regime of short-lived isomers. The results, $g(11/2^-; {^{109}\textrm{Sn}}) = -0.186(8)$ and $g(11/2^-; {^{111}\textrm{Sn}}) = -0.214(4)$, are significantly lower in magnitude than those of the $11/2^-$ isomers in the heavier isotopes and depart from the value expected for a near pure neutron $h_{11/2}$ configuration. Broken-symmetry density functional theory calculations applied to the sequence of $11/2^-$ states reproduce the magnitude and location of this deviation. The $g(11/2^-)$ values are affected by shape core polarization; the odd $0h_{11/2}$ neutron couples to $J^π=2^+,4^+,6^+...$ configurations in the weakly-deformed effective core, causing a decrease in the $g$-factor magnitudes. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2310_11980 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Shape polarization in the tin isotopes near $N=60$ from precision $g$-factor measurements on short-lived $11/2^-$ isomers Gray, T. J. Stuchbery, A. E. Dobaczewski, J. Blazhev, A. Alshammari, H. A. Bignell, L. J. Bonnard, J. Coombes, B. J. Dowie, J. T. H. Gerathy, M. S. M. Kibédi, T. Lane, G. J. McCormick, B. P. Mitchell, A. J. Nicholls, C. Pope, J. G. Reinhard, P. -G. Spinks, N. J. Zhong, Y. Nuclear Experiment Nuclear Theory The $g$ factors of $11/2^-$ isomers in semimagic $^{109}$Sn and $^{111}$Sn (isomeric lifetimes $τ= 2.9(3)$ ns and $τ= 14.4(7)$ ns, respectively) were measured by an extension of the Time Differential Perturbed Angular Distribution technique, which uses \LaBr detectors and the hyperfine fields of a gadolinium host to achieve precise measurements in a new regime of short-lived isomers. The results, $g(11/2^-; {^{109}\textrm{Sn}}) = -0.186(8)$ and $g(11/2^-; {^{111}\textrm{Sn}}) = -0.214(4)$, are significantly lower in magnitude than those of the $11/2^-$ isomers in the heavier isotopes and depart from the value expected for a near pure neutron $h_{11/2}$ configuration. Broken-symmetry density functional theory calculations applied to the sequence of $11/2^-$ states reproduce the magnitude and location of this deviation. The $g(11/2^-)$ values are affected by shape core polarization; the odd $0h_{11/2}$ neutron couples to $J^π=2^+,4^+,6^+...$ configurations in the weakly-deformed effective core, causing a decrease in the $g$-factor magnitudes. |
| title | Shape polarization in the tin isotopes near $N=60$ from precision $g$-factor measurements on short-lived $11/2^-$ isomers |
| topic | Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2310.11980 |