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

S. Naimi 1 G. Audi 1 D. Beck K. Blaum Ch. Böhm Ch. Borgmann M. Breitenfeldt S. George F. Herfurth A. Herlert A. Kellerbauer M. Kowalska D. Lunney 1 E. Minaya Ramirez D. Neidherr M. Rosenbusch L. Schweikhard R. N. Wolf K. Zuber 
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
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. ©2012 American Physical Society
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Submitted on : Monday, November 12, 2012 - 3:29:50 PM
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S. Naimi, G. Audi, D. Beck, K. Blaum, Ch. Böhm, et al.. Surveying the N=40 island of inversion with new manganese masses. Physical Review C, American Physical Society, 2012, 86, pp.014325. ⟨10.1103/PhysRevC.86.014325⟩. ⟨in2p3-00750856⟩



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