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; G. Gwinner; D. Lunney; H. Schatz; J. Dilling

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DOI: 10.1103/PhysRevC.85.064308

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Physical Review C 85 (2012) 064308

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. Audi¹, G. Gwinner, D. Lunney¹, H. Schatz, J. Dilling

(2012)

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.

1:	CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse

Research team: CSNSM SNO

Subject(s)

Physics/Nuclear Experiment


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Submitted on: Thursday, 6 December 2012 14:13:23
Updated on: Friday, 14 December 2012 17:31:36