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Schottky mass measurements of heavy neutron-rich nuclides in the element range $70\leZ \le79$ at the ESR

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arxiv 1308.3135 v1 pith:XKXBI4TJ submitted 2013-08-14 nucl-ex

classification nucl-ex
keywords nucleimassmassesneutron-richappliedcollectivitycorrespondingelement
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abstract

Storage-ring mass spectrometry was applied to neutron-rich $^{197}$Au projectile fragments. Masses of $^{181,183}$Lu, $^{185,186}$Hf, $^{187,188}$Ta, $^{191}$W, and $^{192,193}$Re nuclei were measured for the first time. The uncertainty of previously known masses of $^{189,190}$W and $^{195}$Os nuclei was improved. Observed irregularities on the smooth two-neutron separation energies for Hf and W isotopes are linked to the collectivity phenomena in the corresponding nuclei.

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