K. Blaum et al 2004 Europhys. Lett. 67 586 doi:10.1209/epl/i2004-10089-5
K. Blaum1,2, D. Beck2, G. Bollen3, P. Delahaye1, C. Guénaut4, F. Herfurth2, A. Kellerbauer1, H.-J. Kluge2, D. Lunney4, S. Schwarz3, L. Schweikhard5 and C. Yazidjian2
Show affiliationsAccording 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 68Cu. The resulting unique form of ion ensembles opens up a large variety of new nuclear-physics experiments. Mass excesses of -65567.0(1.6) keV for the 1+ ground state and -64850.3(1.5) keV for the 6− isomeric state have been determined.
21.10.-k Properties of nuclei; nuclear energy levels
Issue 4 (August 2004)
Received 7 April 2004, accepted for publication 2 June 2004
K. Blaum et al 2004 Europhys. Lett. 67 586
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