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Surveying the N = 40 island of inversion with new manganese masses

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons30312

Blaum,  Klaus
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Fakultät für Physik und Astronomie Ruprecht-Karls-Universität;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30319

Böhm,  Christine
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Fakultät für Physik und Astronomie Ruprecht-Karls-Universität;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30324

Borgmann,  Christopher
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Fakultät für Physik und Astronomie Ruprecht-Karls-Universität;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30508

George,  Sebastian
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Institut für Physik, Johannes Gutenberg-Universität;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30661

Kellerbauer,  Alban
Alban Kellerbauer - Emmy Noether Junior Research Group, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30844

Neidherr,  Dennis
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Institut für Physik, Johannes Gutenberg-Universität;

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Citation

Naimi, S., Audi, G., Beck, D., Blaum, K., Böhm, C., Borgmann, C., et al. (2012). Surveying the N = 40 island of inversion with new manganese masses. Physical Review C, 86(1): 014325, pp. 1-10. doi:10.1103/PhysRevC.86.014325.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-D1C9-0
Abstract
High-precision mass measurements of neutron-rich 57−66Mn and 61−63Fe isotopes are reported. The new mass surface shows no shell closure at N=40. In contrast, there is an increase of the two-neutron separation energy at N=38. This behavior is consistent with the onset of collectivity due to the occupation of intruder states from higher orbits, in analogy with the well known “island of inversion” around N=20. Our results indicate that the neutron-rich Mn isotopes, starting from 63Mn, are most likely within the new island of inversion. From the new mass surface, we evaluate the empirical proton-neutron interaction and the pairing gap, both playing a significant role in the structural changes in this region.