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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.02742 |
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| _version_ | 1866910474083237888 |
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| author | Kootte, Brian Gallop, H. Luktuke, C. McNeil, J. C. Gorelov, A. Melconian, D. G. Klimo, J. Behr, B. M. Vargas-Calderon. J. A. |
| author_facet | Kootte, Brian Gallop, H. Luktuke, C. McNeil, J. C. Gorelov, A. Melconian, D. G. Klimo, J. Behr, B. M. Vargas-Calderon. J. A. |
| contents | We have measured the isospin mixing of the I$^π$= 1/2$^+$ E$_x$=2.599 MeV state in nearly-doubly-magic $^{47}$Ca with the isobaric analog 1/2$^+$ state of $^{47}$K. Using the TRIUMF atom trap for $β$ decay, we have measured a nonzero asymmetry of the progeny $^{47}$Ca with respect to the initial $^{47}$K spin polarization, which together with the $β$ asymmetry implies a nonzero ratio of Fermi to Gamow-Teller matrix elements $y$= 0.098$\pm$0.037 for the $1/2^+ \rightarrow 1/2^+$ transition. Interpreting $y$ as mixing between this state and the isobaric analog state implies a Coulomb matrix element magnitude 101 $\pm$ 37 keV. This relatively large matrix element supports a model from the literature of analog-antianalog isospin mixing, which predicts large matrix elements in cases involving excess neutrons over protons occupying more than one major shell. The result supports pursuing a search for time-reversal odd, parity-even, isovector interactions using a correlation in $^{47}$K $β$ decay. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_02742 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Analog-antianalog isospin mixing in $^{47}$K $β^-$ decay Kootte, Brian Gallop, H. Luktuke, C. McNeil, J. C. Gorelov, A. Melconian, D. G. Klimo, J. Behr, B. M. Vargas-Calderon. J. A. Nuclear Experiment High Energy Physics - Experiment We have measured the isospin mixing of the I$^π$= 1/2$^+$ E$_x$=2.599 MeV state in nearly-doubly-magic $^{47}$Ca with the isobaric analog 1/2$^+$ state of $^{47}$K. Using the TRIUMF atom trap for $β$ decay, we have measured a nonzero asymmetry of the progeny $^{47}$Ca with respect to the initial $^{47}$K spin polarization, which together with the $β$ asymmetry implies a nonzero ratio of Fermi to Gamow-Teller matrix elements $y$= 0.098$\pm$0.037 for the $1/2^+ \rightarrow 1/2^+$ transition. Interpreting $y$ as mixing between this state and the isobaric analog state implies a Coulomb matrix element magnitude 101 $\pm$ 37 keV. This relatively large matrix element supports a model from the literature of analog-antianalog isospin mixing, which predicts large matrix elements in cases involving excess neutrons over protons occupying more than one major shell. The result supports pursuing a search for time-reversal odd, parity-even, isovector interactions using a correlation in $^{47}$K $β$ decay. |
| title | Analog-antianalog isospin mixing in $^{47}$K $β^-$ decay |
| topic | Nuclear Experiment High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2405.02742 |