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Population inversion of nuclear states by a Penning trap mass spectrometer

Abstract : 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 $\chemCu}$. The resulting unique form of ion ensembles opens up a large variety of new nuclear-physics experiments. Mass excesses of -65567.0(1.6) $\un{keV}$ for the 1+ ground state and -64850.3(1.5) $\un{keV}$ for the 6- isomeric state have been determined.
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Submitted on : Friday, March 30, 2007 - 1:12:39 PM
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K. Blaum, D. Beck, G. Bollen, P. Delahaye, C. Guénaut, et al.. Population inversion of nuclear states by a Penning trap mass spectrometer. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2004, 67, pp.586-592. ⟨10.1209/epl/i2004-10089-5⟩. ⟨in2p3-00139343⟩



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