Precise atomic masses of neutron-rich Br and Rb nuclei close to the r-process path

A. Jokinen; A. Kankainen; A. Saastamoinen; H. Penttila; I.D. Moore; J. Aysto; J. Hakala; J. Rissanen; P. Karvonen; S. Rahaman

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Precise atomic masses of neutron-rich Br and Rb nuclei close to the r-process path

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arxiv nucl-ex/0703017 v1 pith:W3CYX2QL submitted 2007-03-12 nucl-ex

S. Rahaman , U. Hager , V.-V. Elomaa , T. Eronen , J. Hakala , A. Jokinen , A. Kankainen , P. Karvonen

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I.D. Moore H. Penttila S. Rinta-Antila J. Rissanen A. Saastamoinen T. Sonoda J. Aysto

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The Penning trap mass spectrometer JYFLTRAP, coupled to the Ion-Guide Isotope Separator On-Line (IGISOL) facility at Jyvaskyla, was employed to measure the atomic masses of neutron rich 85 to 92Br and 94 to 97Rb isotopes with a typical accuracy less than 10 keV. Discrepancies with the older data are discussed. Comparison to different mass models is presented. Details of nuclear structure, shell and subshell closures are investigated by studying the two-neutron separation energy and the shell gap energy.

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