Surveying the N=40 island of inversion with new manganese masses
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 occup...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
20 July 2012
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| In: |
Physical review. C, Nuclear physics
Year: 2012, Volume: 86, Issue: 1 |
| ISSN: | 1089-490X |
| DOI: | 10.1103/PhysRevC.86.014325 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevC.86.014325 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevC.86.014325 
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| Author Notes: | S. Naimi, G. Audi, D. Beck, K. Blaum, Ch. Böhm, Ch. Borgmann, M. Breitenfeldt, S. George, F. Herfurth, A. Herlert, A. Kellerbauer, M. Kowalska, D. Lunney, E. Minaya Ramirez, D. Neidherr, M. Rosenbusch, L. Schweikhard, R. N. Wolf, K. Zuber |
| Summary: | 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. |
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| Item Description: | Gesehen am 04.09.2018 |
| Physical Description: | Online Resource |
| ISSN: | 1089-490X |
| DOI: | 10.1103/PhysRevC.86.014325 |