$^{28}$Al Half-life Measurement and the negative mirror asymmetry between the $^{28}$Al($β^-$)$^{28m}$Si and $^{28}$P($β^+$)$^{28m}$Si decays
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2025
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| author | Liu, B. Brodeur, M. Bardayan, D. W. Becchetti, F. D. Boomershine, C. Burdette, D. P. Caves, L. Olivas-Gomez, O. Henderson, S. L. Kolata, J. J. Long, J. Nelson, A. D. O'Malley, P. D. Pardo, A. Zite, R. |
| author_facet | Liu, B. Brodeur, M. Bardayan, D. W. Becchetti, F. D. Boomershine, C. Burdette, D. P. Caves, L. Olivas-Gomez, O. Henderson, S. L. Kolata, J. J. Long, J. Nelson, A. D. O'Malley, P. D. Pardo, A. Zite, R. |
| contents | In the past, the mirror asymmetry parameter has been proposed as a probing mechanism for the presence of beyond the Standard Model second-class currents in nuclear beta decay transitions. However, this was hindered by large uncertainties in the required nuclear structure correction terms. Recently, a new calculation of these corrections attempted, but could not fully explain the negative mirror asymmetry between the $^{28}$Al($β^-$)$^{28m}$Si and $^{28}$P($β^+$)$^{28m}$Si decays. To put the mirror asymmetry parameter on a more solid footing, the half-life of $^{28}$Al was measured for the first time using a radioactive ion beam at the Nuclear Science Laboratory of the University of Notre Dame. The new result, $t_{1/2}=$134.432(34) s, is consistent with most of the past data except for one highly discrepant measurement. The new mirror asymmetry parameter of -3.5(10)$\%$ obtained still does not agree with nuclear structure calculations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_01722 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $^{28}$Al Half-life Measurement and the negative mirror asymmetry between the $^{28}$Al($β^-$)$^{28m}$Si and $^{28}$P($β^+$)$^{28m}$Si decays Liu, B. Brodeur, M. Bardayan, D. W. Becchetti, F. D. Boomershine, C. Burdette, D. P. Caves, L. Olivas-Gomez, O. Henderson, S. L. Kolata, J. J. Long, J. Nelson, A. D. O'Malley, P. D. Pardo, A. Zite, R. Nuclear Experiment In the past, the mirror asymmetry parameter has been proposed as a probing mechanism for the presence of beyond the Standard Model second-class currents in nuclear beta decay transitions. However, this was hindered by large uncertainties in the required nuclear structure correction terms. Recently, a new calculation of these corrections attempted, but could not fully explain the negative mirror asymmetry between the $^{28}$Al($β^-$)$^{28m}$Si and $^{28}$P($β^+$)$^{28m}$Si decays. To put the mirror asymmetry parameter on a more solid footing, the half-life of $^{28}$Al was measured for the first time using a radioactive ion beam at the Nuclear Science Laboratory of the University of Notre Dame. The new result, $t_{1/2}=$134.432(34) s, is consistent with most of the past data except for one highly discrepant measurement. The new mirror asymmetry parameter of -3.5(10)$\%$ obtained still does not agree with nuclear structure calculations. |
| title | $^{28}$Al Half-life Measurement and the negative mirror asymmetry between the $^{28}$Al($β^-$)$^{28m}$Si and $^{28}$P($β^+$)$^{28m}$Si decays |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2505.01722 |