Volume 82, Number 5, June 2008
Article Number 50005
Number of page(s) 6
Section General
Published online 27 May 2008
EPL, 82 (2008) 50005
DOI: 10.1209/0295-5075/82/50005

Time-separated oscillatory fields for high-precision mass measurements on short-lived Al and Ca nuclides

S. George1, 2, G. Audi3, B. Blank4, K. Blaum1, 2, 5, M. Breitenfeldt6, U. Hager7, F. Herfurth1, A. Herlert8, A. Kellerbauer5, H.-J. Kluge1, 9, M. Kretzschmar2, D. Lunney3, R. Savreux1, S. Schwarz10, L. Schweikhard6 and C. Yazidjian1

1  GSI - Planckstraße 1, 64291 Darmstadt, Germany
2  Institut für Physik, Johannes Gutenberg-Universität - 55099 Mainz, Germany
3  CSNSM-IN2P3-CNRS - 91405 Orsay-Campus, France
4  Centre d'Etudes Nucléaires de Bordeaux-Gradignan - 33175 Gradignan Cedex, France
5  Max-Planck-Institut für Kernphysik - 69117 Heidelberg, Germany
6  Institut für Physik, Ernst-Moritz-Arndt-Universität - 17487 Greifswald, Germany
7  Department of Physics, University of Jyväskylä - P.O. Box 35 (YFL), 40014 Jyväskylä, Finland
8  CERN, Physics Department - 1211 Geneva 23, Switzerland
9  Physikalisches Institut, Ruprecht-Karls-Universität - 69120 Heidelberg, Germany
10  NSCL, Michigan State University - East Lansing, MI 48824-1321, USA

received 10 January 2008; accepted in final form 11 April 2008; published June 2008
published online 27 May 2008

High-precision Penning trap mass measurements on the stable nuclide 27Al as well as on the short-lived radionuclides 26Al and 38,39Ca have been performed by use of radiofrequency excitation with time-separated oscillatory fields, i.e. Ramsey's method, recently extended to Penning trap mass measurements of radioactive isotopes. A comparison with the conventional method of a single continuous excitation demonstrates the advantage of up to ten times shorter measurements. The new mass values of 26,27Al are compared to literature values and clarify conflicting data in this mass region. In addition, the resulting mass values of the superallowed $\beta$-emitter 38Ca as well as of the ground state of the $\beta$-emitter 26Alm confirm previous measurements.

07.75.+h - Mass spectrometers.
21.10.Dr - Binding energies and masses.
27.30.+t - Properties of specific nuclei listed by mass ranges: 20$\leqslant$ A$\leqslant$ 38.

© EPLA 2008