Table 2 Measured and deduced atomic and nuclear properties.

From: Towards high-resolution laser ionization spectroscopy of the heaviest elements in supersonic gas jet expansion

Isotope

a () (MHz)

b (2D3/2) (MHz)

δν A,215 (MHz) *

I

μ (μN)†

Q (e b)†

δ < r2>A,215 (fm2)‡

Offline

 227Ac138

2,104.8 (10) (20)

597 (4) (5)

−5,8319 (19) (133)

3/2

1.07

1.74

1.5101 (5) (39)

In-gas-jet

 215Ac126

2,377.0 (10) (40)

13 (26) (20)

0

9/2

3.625 (2) (7)

0.04 (8) (6)

0

 214Ac125

2,498.4 (10) (40)

48 (22) (20)

2,969 (14) (40)

5

4.234 (3) (8)

0.14(6) (6)

−0.0770 (4) (10)

In-gas-cell

 215Ac126

2,386 (17) (90)

 

0

(9/2)

3.64 (3) (14)

 

0

 214Ac125

2,525 (22) (90)

 

3,008 (170) (390)

(5)

4.28 (4) (15)

 

−0.078 (4) (10)

 213Ac124

2,385 (31) (90)

 

4,282 (240) (325)

(9/2)

3.64 (5) (14)

 

−0.111 (6) (8)

 212Ac123

1,837 (22) (90)

 

7,710 (270) (285)

(7)

4.36 (5) (21)

 

−0.200 (7) (7)

  1. Summary of the main results obtained for the actinium isotopes in the different experiments. Statistical (2σ) and systematic (1σ) uncertainties, respectively, are given between parentheses.
  2. *The centre of gravity of 215Ac 683,618,211(12)(100) MHz is used as a reference.
  3. †The μ and Q values of 227Ac as deduced from our experimental data and MCDHF calculations (see Methods) are used as reference and have associated uncertainties of 17 and 6%, respectively. These uncertainties are not included in the error balance of the values of the 212–215Ac isotopes.
  4. ‡Values deduced using the calculated isotope shift parameters M=500(180) GHz amu and F=−39(2) GHz fm−2.
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