245 articles – 3674 Notices  [english version]
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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 approximate to 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 approximate to 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 Rb-94,Rb-97,Rb-98 and Sr-94,Sr-97-99 have uncertainties of less than 4 keV and show deviations of up to 11 sigma 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
CSNSM SNO
Physique/Physique Nucléaire Expérimentale
HIGH-PRECISION – GROUND-STATE – ACCURACY – EVOLUTION – TITAN – IONS – ZR – ENERGIES – FACILITY – RUBIDIUM
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1204.4139