https://doi.org/10.1140/epja/s10050-020-00297-4
Regular Article – Experimental Physics
Lifetimes of core-excited states in semi-magic 
1
Department of Physics, Royal Institute of Technology (KTH), 10691, Stockholm, Sweden
2
Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, 34134, Istanbul, Turkey
3
Oliver Lodge Laboratory, Department of Physics, University of Liverpool, L69 7ZE, Liverpool, UK
4
Department of Chemistry, University of Helsinki, P.O. Box 3, 00014, Helsinki, Finland
5
Institute for Nuclear Research (Atomki), P.O. Box 51, 4001, Debrecen, Hungary
6
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, 35020, Legnaro, Italy
7
Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, 02-093, Warsaw, Poland
8
Department of Physics, University of York, Heslington, YO10 5DD, York, UK
9
Grand Accélérateur National d’Ions Lourds (GANIL) CEA/DSM - CNRS/IN2P3, Bd Henri Becquerel BP 55027, 14076, Caen Cedex 5, France
10
UGC-DAE Consortium for Scientific Research, Kolkata Centre, 700098, Kolkata, India
11
Instituto de Física Corpuscular, CSIC-Universidad de Valencia, 46980, Valencia, Spain
12
Dipartimento di Fisica e Astronomia, Università di Padova, Padova, Italy
13
Science and Art Faculty, Department of Physics, Nigde Omer Halisdemir University, 51200, Nigde, Turkey
14
Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405, Orsay, France
15
Research Center for Nuclear Physics, Osaka University, Osaka, Japan
16
Department of Physics and Astronomy, Uppsala University, 75120, Uppsala, Sweden
17
Department of Physics, University of Jyväskylä, 40014, Jyväskylä, Finland
18
Department of Physics, Tsinghua University, 100084, Beijing, China
Received:
15
June
2020
Accepted:
2
November
2020
Published online:
17
November
2020
Lifetimes of negative-parity states have been determined in the neutron deficient semi-magic (N = 50) nucleus . The fusion-evaporation reaction 
was used to populate high-spin states in at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator facility. The results were obtained using the Doppler Shift Attenuation Method (DSAM) based on the Doppler broadened line shapes produced during the slowing down process of the residual nuclei in a thick 
metallic target. B(M1) and B(E2) reduced transition strengths are compared with predictions from large-scale shell-model calculations.
© The Author(s) 2020
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