학술논문
Nuclear charge radius of $^{26m}$Al and its implication for V$_{ud}$ in the quark-mixing matrix
Document Type
Working Paper
Author
Plattner, P.; Wood, E.; Ayoubi, L. Al; Beliuskina, O.; Bissell, M. L.; Blaum, K.; Campbell, P.; Cheal, B.; de Groote, R. P.; Devlin, C. S.; Eronen, T.; Filippin, L.; Ruíz, R. F. García; Ge, Z.; Geldhof, S.; Gins, W.; Godefroid, M.; Heylen, H.; Hukkanen, M.; Imgram, P.; Jaries, A.; Jokinen, A.; Kanellakopoulos, A.; Kankainen, A.; Kaufmann, S.; König, K.; Koszorús, Á.; Kujanpää, S.; Lechner, S.; Malbrunot-Ettenauer, S.; Müller, P.; Mathieson, R.; Moore, I.; Nörtershäuser, W.; Nesterenko, D.; Neugart, R.; Neyens, G.; Ortiz-Cortes, A.; Penttilä, H.; Pohjalainen, I.; Raggio, A.; Reponen, M.; Rinta-Antila, S.; Rodríguez, L. V.; Romero, J.; Sánchez, R.; Sommer, F.; Stryjczyk, M.; Virtanen, V.; Xie, L.; Xu, Z. Y.; Yang, X. F.; Yordanov, D. T.
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Subject
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Abstract
Collinear laser spectroscopy was performed on the isomer of the aluminium isotope $^{26m}$Al. The measured isotope shift to $^{27}$Al in the $3s^{2}3p\;^{2}\!P^\circ_{3/2} \rightarrow 3s^{2}4s\;^{2}\!S_{1/2}$ atomic transition enabled the first experimental determination of the nuclear charge radius of $^{26m}$Al, resulting in $R_c$=\qty{3.130\pm.015}{\femto\meter}. This differs by 4.5 standard deviations from the extrapolated value used to calculate the isospin-symmetry breaking corrections in the superallowed $\beta$ decay of $^{26m}$Al. Its corrected $\mathcal{F}t$ value, important for the estimation of $V_{ud}$ in the CKM matrix, is thus shifted by one standard deviation to \qty{3071.4\pm1.0}{\second}.
Comment: 5 pages, 2 figures, submitted to Phys. Rev. Lett
Comment: 5 pages, 2 figures, submitted to Phys. Rev. Lett