Surveying the N = 40 island of inversion with new manganese masses
- Naimi, S.
- Audi, G.
- Beck, D.
- Blaum, K.
- Böhm, C.
- Borgmann, C.
- Breitenfeldt, M.
- George, S.
- Herfurth, F.
- Herlert, A.
- Kellerbauer, A.
- Kowalska, M.
- Lunney, D.
- Minaya-Ramirez, E.
- Neidherr, D.
- Rosenbusch, M.
- Schweikhard, L.
- Wolf, R.
- Zuber, K.
DOIAbstract
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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