aₑ · electron magnetic-moment anomaly

전자 이상 자기 모멘트

Takeaway

The relative standard uncertainty fell by a factor of about 17,222 from the 1969 to the 2022 edition (2.7×10⁻⁶ → 1.6×10⁻¹⁰): the error bars narrowed that much.
Of 9 earlier editions with a measured value, 8 have the 2022 value outside ±1σ (the error bar) and 2 outside ±2σ (the bar doubled); the normal expectation is about 1 in 3 and 1 in 22.
The largest move between editions came in 1969→1973, at 3.8 times the combined standard uncertainty of the two editions (|z| = 3.8).

Unit: none (dimensionless)
Note: The 1969 and 1973 editions list g/2 = 1 + aₑ; the value minus 1 is used.
M1: Half-life (years): 3.50 (2.87–4.47)

Value ±1σ by edition2022

Relative deviation from the 2022 value (symmetric-log axis). Open circles: the error bar does not reach the 2022 value. Squares: exact.

Editionyear of the recommended values (data cut-off)	As printedexactly as in the source table; digits in parentheses are the standard uncertainty in the last digits	Standard uncertaintyhalf-width of the error bar (±1σ)	Relative standard uncertaintystandard uncertainty ÷ \|value\|: bar width relative to the value	z vs previous editionmove from the previous edition ÷ combined standard uncertainty of the two	z vs 2022(2022 value − this value) ÷ this edition's standard uncertainty	Source locationpage and table of the paper, or file and line of NIST's table
1969	1.0011596389(31)	3.1×10⁻⁹	2.7×10⁻⁶		4.2840	477 table XXXII
1973	1.0011596567(35)	3.5×10⁻⁹	3.0×10⁻⁶	3.8071	−1.2913	718 table 33.1
1986	1.159652193(10) e-3	1.0×10⁻¹¹	8.6×10⁻⁹	−1.2877	−1.2540	codata86 p.9 table 2
1998	1.159 652 1869(41) e-3	4.1×10⁻¹²	3.5×10⁻⁹	−0.5644	−1.5707	1998 ASCII:89
2002	1.159 652 1859(38) e-3	3.8×10⁻¹²	3.3×10⁻⁹	−0.1789	−1.4316	2002 ASCII:90
2006	1.159 652 181 11(74) e-3	7.4×10⁻¹³	6.4×10⁻¹⁰	−1.2373	−0.8784	2006 ASCII:91
2010	1.159 652 180 76 e-3	2.7×10⁻¹³	2.3×10⁻¹⁰	−0.4443	−1.1111	2010 ASCII:96
2014	1.159 652 180 91 e-3	2.6×10⁻¹³	2.2×10⁻¹⁰	0.4002	−1.7308	2014 ASCII:96
2018	1.159 652 181 28 e-3	1.8×10⁻¹³	1.6×10⁻¹⁰	1.1700	−4.5556	2018 ASCII:103
2022	1.159 652 180 46 e-3	1.8×10⁻¹³	1.6×10⁻¹⁰	−3.2213		2022 ASCII:104