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Direct high-precision mass measurements on Am-241,Am-243, Pu-244, and Cf-249

M. Eibach T. Beyer K. Blaum M. Block C. E. Dullmann K. Eberhardt J. Grund S. Nagy H. Nitsche W. Nortershauser D. Renisch K. P Rykaczewski F. Schneider C. Smorra J. Vieten M. Wang 1 K. Wendt
CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609, CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Abstract : The absolute masses of four long-lived transuranium nuclides, Am-241,Am-243, Pu-244, and Cf-249, in the vicinity of the deformed N = 152 neutron shell closure have been measured directly with the Penning-trap mass spectrometer TRIGA-TRAP. Our measurements confirm the AME2012 mass values of 241,243Am and 244Pu within one standard deviation, which were indirectly determined, by decay spectroscopy studies. In the case of the Cf-249 mass, a discrepancy of more than three standard deviations has been observed, affecting absolute masses even in the superheavy element region. The implementation of the mass values into the AME2012 network yields a reduced mass uncertainty for 84 nuclides, particularly for Pu-244 and its strongly correlated a decay chains.
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Submitted on : Monday, August 25, 2014 - 5:27:19 PM
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M. Eibach, T. Beyer, K. Blaum, M. Block, C. E. Dullmann, et al.. Direct high-precision mass measurements on Am-241,Am-243, Pu-244, and Cf-249. Physical Review C, American Physical Society, 2014, 89, pp.064318. ⟨10.1103/PhysRevC.89.064318⟩. ⟨in2p3-01057976⟩



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