https://doi.org/10.1140/epja/s10050-023-00967-z
Regular Article - Experimental Physics
Matter radius of the doubly-magic 
Ni measured in a storage ring
1
Technische Universität Darmstadt, Fachbereich Physik, 64289, Darmstadt, Germany
2
GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany
3
Helmholtz Forschungsakademie Hessen für FAIR, 64289, Darmstadt, Germany
4
Nuclear Energy Group, ESRIG, University of Groningen, Zernikelaan 25, 9747, Groningen, The Netherlands
5
Institute for Nuclear Research, MTA-Atomki, Debrecen, Hungary
6
Physikalisches Institut, Justus-Liebig-Universität Gießen, Giessen, Germany
7
Ioffe Physical-Technical Institute, St. Petersburg, Russia
8
Department of Physics, Kyoto University, Kyoto, Japan
9
Physik-Department, Technische Universität München, Munich, Germany
10
Department of Physics, University of Tehran, Tehran, Iran
11
Department of Physics, University of Tsukuba, Tsukuba, Japan
12
RIKEN Nishina Center, Wako, Saitama, Japan
13
School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
14
Department of Physics, Saitama University, Sakura-ku, Saitama, Japan
15
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
16
Indian Institute of Technology (Indian School of Mines) Dhanbad, 826004, Jharkhand, India
Received:
1
August
2022
Accepted:
28
February
2023
Published online:
20
April
2023
The matter radius of the doubly magic Ni was extracted from a measurement of the differential cross section by employing, for the first time, elastic proton scattering in inverse kinematics with a radioactive beam at 
MeV/nucleon circulating in a storage ring and passing an internal hydrogen gas-jet target with a revolution frequency of around 2 MHz. The novel experimental scheme is based on UHV-compatible Si detectors operated as active vacuum windows, which were implemented in the ESR storage ring at GSI. A matter radius 
fm was extracted for the doubly-magic self-conjugate nucleus Ni.
Deceased.
© The Author(s) 2023
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