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Title	Extending and refining the mass surface around $^{208}$Pb by high-precision Penning-trap mass spectrometry with ISOLTRAP
Author(s)	Schweikhard, L C ; Herfurth, F ; Stora, T ; Blaum, K ; Beck, D ; Kowalska, M ; Schwarz, S ; Stanja, J ; Herlert, A J ; Yamaguchi, T
Experiment	IS518
Greybook	See IS518 experiment
Approved	02 March 2011
Status	Finished
Collaboration	ISOLDE
Accelerator	CERN ISOLDE
Abstract	We propose high-precision mass spectrometry of nuclides around the doubly magic $^{208}$Pb. On the neutron-rich side, we aim to extend the knowledge of Fr, At, Hg, and Au masses to study the robustness of the N = 126 shell closure and to provide mass data necessary for modeling the rapid-neutron-capture process. On the proton-rich side, we aim at high-resolution mass spectrometry of selected Au, At, and Fr isotopes to verify the predicted existence of very low-lying isomeric states. The proposal will make use of newly-available laser-ionization schemes for Au and At. Finally, the recently implemented multi-reflection time-of-flight mass separator for auxiliary isobaric purification now allows measurements which were not feasible before.
Related document(s)	CERN-INTC-2011-015  (INTC-P-299)

Contact: Kreim, S W