HAL : in2p3-00716289, version 1

arXiv : 1204.4139

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 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

équipe(s) de recherche : CSNSM SNO

Thème(s)

:

Physique/Physique Nucléaire Expérimentale

Mot(s)-clé(s) : HIGH-PRECISION – GROUND-STATE – ACCURACY – EVOLUTION – TITAN – IONS – ZR – ENERGIES – FACILITY – RUBIDIUM

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Contributeur : Christine Hadrossek <>

Soumis le : Mardi 10 Juillet 2012, 11:58:29

Dernière modification le : Vendredi 14 Décembre 2012, 17:35:31