Ramsey method of separated oscillatory fields for high-precision penning trap mass spectrometry.
Ramsey's method of separated oscillatory fields is applied to the excitation of the cyclotron motion of short-lived ions in a Penning trap to improve the precision of their measured mass values. The theoretical description of the extracted ion-cyclotron-resonance line shape is derived and its correctness demonstrated experimentally by measuring the mass of the short-lived 38Ca nuclide with an uncertainty of 1.1 x 10(-8) using the Penning trap mass spectrometer ISOLTRAP at CERN. The mass of the superallowed beta emitter 38Ca contributes for testing the theoretical corrections of the conserved-vector-current hypothesis of the electroweak interaction. It is shown that the Ramsey method applied to Penning trap mass measurements yields a statistical uncertainty similar to that obtained by the conventional technique but 10 times faster. Thus the technique is a new powerful tool for high-precision mass measurements.
George
S
S
GSI, Planckstrasse 1, 64291 Darmstadt, Germany. george@uni-mainz.de
Baruah
S
S
Blank
B
B
Blaum
K
K
Breitenfeldt
M
M
Hager
U
U
Herfurth
F
F
Herlert
A
A
Kellerbauer
A
A
Kluge
H-J
HJ
Kretzschmar
M
M
Lunney
D
D
Savreux
R
R
Schwarz
S
S
Schweikhard
L
L
Yazidjian
C
C