Table 1 Antihydrogen atom counts

From: Characterization of the 1S–2S transition in antihydrogen

 

Laser detuning, D (kHz)

Number of trials

Atoms lost during laser exposure, L

Atoms lost during microwave exposure, M

Surviving atoms, S

Initially trapped atoms, Ni

Set 1

−200

21

7 ± 7

383 ± 23

504 ± 25

894 ± 35

−100

21

22 ± 9

415 ± 24

494 ± 24

931 ± 35

0

21

264 ± 24

423 ± 24

217 ± 16

904 ± 38

+100

21

75 ± 14

411 ± 23

424 ± 23

910 ± 35

Set 2

−200

21

26 ± 9

394 ± 23

466 ± 24

886 ± 34

−25

21

113 ± 16

423 ± 24

326 ± 20

862 ± 35

0

21

219 ± 22

390 ± 23

269 ± 18

878 ± 37

+25

21

173 ± 20

438 ± 24

296 ± 19

907 ± 37

Set 3

−200

23

8 ± 7

354 ± 22

479 ± 24

841 ± 33

0

23

303 ± 26

454 ± 25

248 ± 17

1,005 ± 40

+50

23

176 ± 20

390 ± 23

339 ± 20

905 ± 37

+200

23

36 ± 11

446 ± 24

459 ± 23

941 ± 35

Set 4

−200

21

7 ± 7

525 ± 26

541 ± 25

1,073 ± 37

−50

21

86 ± 15

475 ± 25

495 ± 24

1,056 ± 38

0

21

274 ± 25

480 ± 25

275 ± 18

1,029 ± 40

+25

21

202 ± 21

516 ± 26

305 ± 19

1,023 ± 38

Total

 

344

1,991

6,917

6,137

15,045

  1. The integrated number of antihydrogen atoms is listed for each laser detuning (at 243 nm) within each set of trials. The background has been subtracted. Uncertainties quoted are one standard deviation (s.d.) counting errors. We refer to L as the ‘appearance signal’; S is used to infer the ‘disappearance signal’.
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