Volume 67, Number 4, August 2004
|Page(s)||586 - 592|
|Published online||01 August 2004|
Population inversion of nuclear states by a Penning trap mass spectrometer
CERN, Physics Department - 1211 Genève 23, Switzerland
2 GSI - Planckstraße 1, 64291 Darmstadt, Germany
3 NSCL, Michigan State University - East Lansing, MI 48824-1321, USA
4 CSNSM-IN2P3-CNRS - 91405 Orsay-Campus, France
5 Institute of Physics, Ernst-Moritz-Arndt-University - 17487 Greifswald, Germany
Accepted: 2 June 2004
According to the energy-mass equivalence, E=mc2, excited long-lived nuclear states, so-called isomers, are distinguished from the ground state by their additional mass. The ultra-high accuracy provided by Penning traps now allows to weigh nuclear excitation energies. With the on-line Penning trap mass spectrometer ISOLTRAP, we have developed a mass-separation procedure of sufficient resolving power to isolate particles of a selected isomeric state from an ensemble delivered from the radioactive beam facility ISOLDE at CERN, first demonstrated for . The resulting unique form of ion ensembles opens up a large variety of new nuclear-physics experiments. Mass excesses of for the 1+ ground state and for the 6- isomeric state have been determined.
PACS: 21.10.Dr – Binding energies and masses / 07.75.+h – Mass spectrometers / 21.10.-k – Properties of nuclei; nuclear energy levels
© EDP Sciences, 2004
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