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Penning-trap mass spectrometry of highly charged, neutron-rich Rb and Sr isotopes in the vicinity of A≈100

V. V. Simon T. Brunner U. Chowdhury B. Eberhardt S. Ettenauer A. T. Gallant E. Mané M. C. Simon P. Delheij M. R. Pearson G. Audi 1 G. Gwinner D. Lunney 1 H. Schatz J. Dilling
1 CSNSM SNO
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
Abstract : The neutron-rich mass region around A≈100 presents challenges for modeling the astrophysical r process because of rapid shape transitions. We report on mass measurements using the TITAN Penning trap at TRIUMF-ISAC to attain more reliable theoretical predictions of r-process nucleosynthesis paths in this region. A new approach using highly charged (q=15+) ions has been applied which considerably saves measurement time and preserves accuracy. New mass measurements of neutron-rich 94,97,98Rb and 94,97-99Sr have uncertainties of less than 4 keV and show deviations of up to 11σ when compared to previous measurements. An analysis using a parameterized r-process model is performed and shows that mass uncertainties for the A=90 abundance region are eliminated.
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http://hal.in2p3.fr/in2p3-00762090
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Submitted on : Thursday, December 6, 2012 - 2:13:23 PM
Last modification on : Wednesday, September 16, 2020 - 5:43:40 PM

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V. V. Simon, T. Brunner, U. Chowdhury, B. Eberhardt, S. Ettenauer, et al.. Penning-trap mass spectrometry of highly charged, neutron-rich Rb and Sr isotopes in the vicinity of A≈100. Physical Review C, American Physical Society, 2012, 85, pp.064308. ⟨10.1103/PhysRevC.85.064308⟩. ⟨in2p3-00762090⟩

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