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arXiv · 1808.03997

Precision Mass Measurement of $^{58-63}$Cr: Nuclear Collectivity towards the \emph{N}=40 Island of Inversion

Maxime Mougeot·Dinko Atanasov·Klaus Blaum·Katherina Chrysalidis·Tom Day Goodacre·Dmitrii Fedorov·Valentin Fedosseev·Sebastian George·Frank Herfurth·Jason D. Holt·David Lunney·Vladimir Manea·Bruce Marsh·Dennis Neidherr·Marco Rosenbusch·Sebastian Rothe·Lutz Schweikhard·Achim Schwenk·Christophe Seiffert·Johannes Simonis·Steven Ragnar Stroberg·Andree Welker·Frank Wienholtz·Robert N. Wolf·Kai Zuber
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Abstract

The neutron-rich isotopes $^{58-63}$Cr were produced for the first time at the ISOLDE facility and their masses were measured with the ISOLTRAP spectrometer. The new values are up to 300 times more precise than those in the literature and indicate significantly different nuclear structure from the new mass-surface trend. A gradual onset of deformation is found in this proton and neutron mid-shell region, which is a gateway to the second island of inversion around \emph{N}=40. In addition to comparisons with density-functional theory and large-scale shell-model calculations, we present predictions from the valence-space formulation of the \emph{ab initio} in-medium similarity renormalization group, the first such results for open-shell chromium isotopes.

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Maxime Mougeot, Dinko Atanasov, Klaus Blaum, Katherina Chrysalidis, Tom Day Goodacre, Dmitrii Fedorov, Valentin Fedosseev, Sebastian George, Frank Herfurth, Jason D. Holt, David Lunney, Vladimir Manea, Bruce Marsh, Dennis Neidherr, Marco Rosenbusch, Sebastian Rothe, Lutz Schweikhard, Achim Schwenk, Christophe Seiffert, Johannes Simonis, Steven Ragnar Stroberg, Andree Welker, Frank Wienholtz, Robert N. Wolf, Kai Zuber. 2018-08-12. Precision Mass Measurement of $^{58-63}$Cr: Nuclear Collectivity towards the \emph{N}=40 Island of Inversion. https://doi.org/10.1103/physrevlett.120.232501

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