Journal
PHYSICS LETTERS B
Volume 784, Issue -, Pages 392-396Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2018.06.067
Keywords
In-beam gamma-ray spectroscopy; Island of inversion around N=40; Strong coupling; Structure evolutionwell
Funding
- National Natural Science Foundation of China [11635003, 11675225, 11405224, U1632144, 11435014]
- National Key R&D Program of China [2018YFA0404400]
- Hundred Talented Project of the Chinese Academy of Sciences
- Key Research Program of the Chinese Academy of Sciences [XDPB09]
- European Research Council [MINOS-258567]
- STFC
- Ministry of Science and Technology [DTCB 09/17/VKHKTHN, DTDLCN.25/18]
- national key research and development program [MOST 2016YFA0400501]
- BMBF [05P15RDFN1, 05P12RDFN8]
- China Scholarship Council [201700260183]
- [GINOP-2.3.3-15-2016-00034]
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Excited states in Mn-63,Mn-65,Mn-67 were studied via in-beam gamma-ray spectroscopy following knockout reactions from Fe-68. Similar level schemes, consisting of the 11/2(-), 9/2(-), 7/2(-) and 5/2(g.s.)(-) level sequence, connected by I -> I - 1 transitions, were established, the first time for Mn-65,Mn-67. Their level structures show features consistent with strongly-coupled rotational bands with K= 5/2. State-of-the-art shellmodel calculations with the modified LNPS effective interaction reproduce the observed levels remarkably well and suggest the dominance of 4-particle-4-hole neutron configurations for all the states. The data on the low-lying excited states of odd-mass Mn53-67 provide a textbook example of nuclear structure evolution from weak coupling through decoupling to strong coupling along a single isotopic chain on the n-rich side of the beta stability line. These results help to deepen our understanding of the N= 40 island of inversion. (c) 2018 The Authors. Published by Elsevier B.V.
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