https://doi.org/10.1140/epja/s10050-023-01051-2
Regular Article - Experimental Physics
Study of 
gap evolution around 
: new structure information for 
Ge
1
Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405, Orsay, France
2
Institut Universitaire de France, 1 Rue Descartes, 75005, Paris, France
3
Department of Physics, Faculty of Science, University of Novi Sad, Trg Dositeja Obradovica 3, 21000, Novi Sad, Serbia
4
School of Mathematics and Physics, University of Surrey, GU2 7XH, Guildford, UK
5
Institut für Kernphysik, Technische Universität Darmstadt, 64289, Darmstadt, Germany
6
National Physical Laboratory, TW11 0LW, Teddington, Middlesex, UK
7
Normandie University, ENSICAEN, UNICAEN, CNRS/IN2P3, LPC Caen, 14000, Caen, France
8
Faculty of Physics, University of Warsaw, Warsaw, Poland
9
Instituto de Física Corpuscular, CSIC-University of Valencia, Valencia, Spain
10
Grupo de Física Nuclear and IPARCOS, Universidad Complutense de Madrid, Madrid, Spain
11
Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via Celoria 16, 20133, Milan, Italy
12
Institut für Kernphysik, Universität zu Köln, 50937, Köln, Germany
13
Dipartimento di Fisica, Universitá degli Studi di Milano, Via Celoria 16, 20133, Milan, Italy
14
Institute of Nuclear Physics, Polish Academy of Sciences, 31342, Krakow, Poland
15
Institut Pluridisciplinaire Hubert Curien, 23 Rue du Loess, 67037, Strasbourg, France
16
CNRS, UMR7178, 67037, Strasbourg, France
17
RIKEN Nishina Center, 2-1 Hirosawa, 351-0198, Wako, Saitama, Japan
18
School of Physics and Astronomy, University of Manchester, Oxford Road, M13 9PL, Manchester, UK
19
Subatech, IMT-Atlantique, Université de Nantes, CNRS-IN2P3, 44307, Nantes, France
20
Departement of Physics, University of Oslo, P.O. Box 1048, Blindern, 0316, Oslo, Norway
21
INFN Laboratori Nazionali di Legnaro, Viale dell’Universitá 2, 35020, Legnaro, Italy
22
GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291, Darmstadt, Germany
23
CENBG, UMR5797, Université de Bordeaux, CNRS, 33170, Gradignan, France
24
European Commission, Joint Research Center, 2440, Geel, Belgium
25
TRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver, BC, Canada
26
Grand Accélérateur National d’Ions Lourds, Bd Henri Becquerel, 14076, Caen, France
27
School of Computing, Engineering and Mathematics, University of Brighton, BN2 4GJ, Brighton, UK
28
Institute for Nuclear and Radiation Physics, KU Leuven, 3000, Leuven, Belgium
29
Extreme Light Infrastructure-Nuclear Physics (ELI-NP)/Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH), Str. Reactorului 30, 077125, Bucharest-Măgurele, Romania
30
Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 1784, Sofia, Bulgaria
Received:
3
February
2023
Accepted:
6
June
2023
Published online:
11
July
2023
Medium spin states of light N = 50 isotones have been populated using fast neutron-induced fission of 
Th. Online prompt 
spectroscopy has been performed using the hybrid spectrometer 
Ball coupled to the LICORNE directional neutron source at the ALTO facility of IJCLab. Medium spin states of the neutron-rich nucleus Ge have been investigated using - and -- coincidence data to exploit the resolving power of Ball. Two new transitions were assigned to this nucleus and a new level was placed in the level scheme. We tentatively assigned to this new state a (
) spin-parity, which is interpreted as a new core breaking state. This provides further insight into the energy evolution of the shell gap toward 
Ni.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
