Direct high-precision mass measurements on $^{241,243}\mathrm{Am}$, $^{244}\mathrm{Pu}$, and $^{249}\mathrm{Cf}$

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

M. Eibach, T. Beyer, K. Blaum, M. Block, Ch. E. Düllmann, K. Eberhardt, J. Grund, Sz. Nagy, H. Nitsche, W. Nörtershäuser, D. Renisch, K. P. Rykaczewski, F. Schneider, C. Smorra, J. Vieten, M. Wang, and K. Wendt

Phys. Rev. C 89, 064318 – Published 26 June 2014

Abstract

The absolute masses of four long-lived transuranium nuclides, ${}^{241, 243}{Am}$ , ${}^{244}{Pu}$ , ${}^{244}{Pu}$ , and ${}^{249}{Cf}$ , 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 ${}^{241, 243}{Am}$ and ${}^{244}{Pu}$ within one standard deviation, which were indirectly determined, by decay spectroscopy studies. In the case of the ${}^{249}{Cf}$ 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 ${}^{244}{Pu}$ and its strongly correlated $α$ decay chains.

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Received 16 April 2014

DOI:https://doi.org/10.1103/PhysRevC.89.064318

Authors & Affiliations

M. Eibach^1,2,*, T. Beyer¹, K. Blaum¹, M. Block³, Ch. E. Düllmann^3,4,5, K. Eberhardt^2,5, J. Grund⁴, Sz. Nagy¹, H. Nitsche^6,7, W. Nörtershäuser^2,3,8, D. Renisch², K. P. Rykaczewski⁹, F. Schneider^2,10, C. Smorra^1,†, J. Vieten¹¹, M. Wang^1,12,13, and K. Wendt¹⁰

¹Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
²Institut für Kernchemie, Johannes Gutenberg-Universität, 55128 Mainz, Germany
³GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
⁴PRISMA Cluster of Excellence and Institut für Kernchemie, Johannes Gutenberg-Universität, 55128 Mainz, Germany
⁵Helmholtz-Institut Mainz, 55099 Mainz, Germany
⁶Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
⁷University of California, Berkeley, California 94720, USA
⁸Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
⁹Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
¹⁰Institut für Physik, Johannes Gutenberg-Universität, 55128 Mainz, Germany
¹¹Technische Universität München, 80333 München, Germany
¹²Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Université Paris-Sud, 91405 Orsay Campus, France
¹³Institute of Modern Physics, Lanzhou 730000, China

^*martin.eibach@uni-mainz.de
^†Present address: RIKEN, Advanced Science Institute, Hirosawa 2-1, Saitama 351-0198, Japan.

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Vol. 89, Iss. 6 — June 2014

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Physical Review C

covering nuclear physics

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

M. Eibach, T. Beyer, K. Blaum, M. Block, Ch. E. Düllmann, K. Eberhardt, J. Grund, Sz. Nagy, H. Nitsche, W. Nörtershäuser, D. Renisch, K. P. Rykaczewski, F. Schneider, C. Smorra, J. Vieten, M. Wang, and K. Wendt

Phys. Rev. C 89, 064318 – Published 26 June 2014

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Physical Review C

covering nuclear physics

Direct high-precision mass measurements on Am241,243, Pu244, and Cf249

M. Eibach, T. Beyer, K. Blaum, M. Block, Ch. E. Düllmann, K. Eberhardt, J. Grund, Sz. Nagy, H. Nitsche, W. Nörtershäuser, D. Renisch, K. P. Rykaczewski, F. Schneider, C. Smorra, J. Vieten, M. Wang, and K. Wendt

Phys. Rev. C 89, 064318 – Published 26 June 2014

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