Plattner P, Wood E, Al Ayoubi L, Beliuskina O, Bissell M L, Blaum K, Campbell P, Cheal B, de Groote R P, Devlin C S, Eronen T, Filippin L, Garcia Ruiz R F, 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
ISOLDE, CERN Experimental Physics Department, Geneva 23, 1211 Genevè, Switzerland.
Universität Innsbruck, Innrain 52, 6020 Innsbruck, Austria.
Phys Rev Lett. 2023 Dec 1;131(22):222502. doi: 10.1103/PhysRevLett.131.222502.
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_{3/2}^{○}→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}=3.130(15) fm. This differs by 4.5 standard deviations from the extrapolated value used to calculate the isospin-symmetry breaking corrections in the superallowed β decay of ^{26m}Al. Its corrected Ft value, important for the estimation of V_{ud} in the Cabibbo-Kobayashi-Maskawa matrix, is thus shifted by 1 standard deviation to 3071.4(1.0) s.
对铝同位素(^{26m}Al)的异构体进行了共线激光光谱分析。在(3s^{2}3p\ ^{2}P_{3/2}^{○}→3s^{2}4s\ ^{2}S_{1/2})原子跃迁中测量到相对于(^{27}Al)的同位素位移，从而首次通过实验确定了(^{26m}Al)的核电荷半径，结果为(R_{c}=3.130(15)\ fm)。这与用于计算(^{26m}Al)超允许β衰变中同位旋对称性破缺修正的外推值相差4.5个标准差。因此，其校正后的(Ft)值（对于估算卡比博-小林-益川矩阵中的(V_{ud})很重要）移动了1个标准差，变为(3071.4(1.0)\ s)。
