تقرير
Direct measurement of hexacontatetrapole, $\textbf{E6}$ {\gamma} decay from $^{\textbf{53m}}$Fe
| العنوان: | Direct measurement of hexacontatetrapole, $\textbf{E6}$ {\gamma} decay from $^{\textbf{53m}}$Fe |
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| المؤلفون: | Palazzo, T., Mitchell, A. J., Lane, G. J., Stuchbery, A. E., Brown, B. A., Reed, M. W., Akber, A., Coombes, B. J., Dowie, J. T. H., Eriksen, T. K., Gerathy, M. S. M., Kibédi, T., Tornyi, T., de Vries, M. O. |
| سنة النشر: | 2023 |
| المجموعة: | Nuclear Experiment |
| مصطلحات موضوعية: | Nuclear Experiment |
| الوصف: | The only proposed observation of a discrete, hexacontatetrapole ($E6$) transition in nature occurs from the T$_{1/2}$ = 2.54(2)-minute decay of $^{53m}$Fe. However, there are conflicting claims concerning its $\gamma$-decay branching ratio, and a rigorous interrogation of $\gamma$-ray sum contributions is lacking. Experiments performed at the Australian Heavy Ion Accelerator Facility were used to study the decay of $^{53m}$Fe. For the first time, sum-coincidence contributions to the weak $E6$ and $M5$ decay branches have been firmly quantified using complementary experimental and computational methods. Agreement across the different approaches confirms the existence of the real $E6$ transition; the $M5$ branching ratio and transition rate have also been revised. Shell model calculations performed in the full $pf$ model space suggest that the effective proton charge for high-multipole, $E4$ and $E6$, transitions is quenched to approximately two-thirds of the collective $E2$ value. Correlations between nucleons may offer an explanation of this unexpected phenomenon, which is in stark contrast to the collective nature of lower-multipole, electric transitions observed in atomic nuclei. Comment: 9 pages, 4 figures, to be published in Physical Review Letters |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.130.122503 |
| URL الوصول: | http://arxiv.org/abs/2302.05544 |
| رقم الأكسشن: | edsarx.2302.05544 |
| قاعدة البيانات: | arXiv |
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