Precise Mass Measurements of $A=133$ Isobars with the Canadian Penning Trap: Resolving the $Q_{β^-}$ anomaly at $^{133}$Te
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866929529703890944 |
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| author | Valverde, A. A. Kondev, F. G. Liu, B. Ray, D. Brodeur, M. Burdette, D. P. Callahan, N. Cannon, A. Clark, J. A. Hoff, D. E. M. Orford, R. Porter, W. S. Sharma, K. S. Varriano, L. |
| author_facet | Valverde, A. A. Kondev, F. G. Liu, B. Ray, D. Brodeur, M. Burdette, D. P. Callahan, N. Cannon, A. Clark, J. A. Hoff, D. E. M. Orford, R. Porter, W. S. Sharma, K. S. Varriano, L. |
| contents | We report precision mass measurements of $^{133}$Sb, $^{133g,m}$Te, and $^{133g,m}$I, produced at CARIBU at Argonne National Laboratory's ATLAS facility and measured using the Canadian Penning Trap mass spectrometer. These masses clarify an anomaly in the $^{133}$Te $β$-decay. The masses reported in the 2020 Atomic Mass Evaluation (M. Wang et al., 2021) produce $Q_{β^-}(^{133}$Te)=2920(6) keV; however, the highest-lying $^{133}$I level populated in this decay is observed at $E_i=2935.83(15)$ keV, resulting in an anomalous $Q_{β^{-}}^{i}=-16(6)$~keV. Our new measurements give $Q_{β^-}(^{133}\text{Te})=2934.8(11)$ keV, a factor of five more precise, yielding $Q{_β^i}=-1.0(12)$~keV, a 3$σ$ shift from the previous results. This resolves this anomaly, but indicates further anomalies in our understanding of the structure of this isotope. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_06903 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Precise Mass Measurements of $A=133$ Isobars with the Canadian Penning Trap: Resolving the $Q_{β^-}$ anomaly at $^{133}$Te Valverde, A. A. Kondev, F. G. Liu, B. Ray, D. Brodeur, M. Burdette, D. P. Callahan, N. Cannon, A. Clark, J. A. Hoff, D. E. M. Orford, R. Porter, W. S. Sharma, K. S. Varriano, L. Nuclear Experiment We report precision mass measurements of $^{133}$Sb, $^{133g,m}$Te, and $^{133g,m}$I, produced at CARIBU at Argonne National Laboratory's ATLAS facility and measured using the Canadian Penning Trap mass spectrometer. These masses clarify an anomaly in the $^{133}$Te $β$-decay. The masses reported in the 2020 Atomic Mass Evaluation (M. Wang et al., 2021) produce $Q_{β^-}(^{133}$Te)=2920(6) keV; however, the highest-lying $^{133}$I level populated in this decay is observed at $E_i=2935.83(15)$ keV, resulting in an anomalous $Q_{β^{-}}^{i}=-16(6)$~keV. Our new measurements give $Q_{β^-}(^{133}\text{Te})=2934.8(11)$ keV, a factor of five more precise, yielding $Q{_β^i}=-1.0(12)$~keV, a 3$σ$ shift from the previous results. This resolves this anomaly, but indicates further anomalies in our understanding of the structure of this isotope. |
| title | Precise Mass Measurements of $A=133$ Isobars with the Canadian Penning Trap: Resolving the $Q_{β^-}$ anomaly at $^{133}$Te |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2312.06903 |