https://doi.org/10.1140/epja/s10050-020-00044-9
Regular Article – Experimental Physics
Gamow–Teller strength distributions of 
and 
using the 
charge-exchange reaction
1
KVI-CART, University of Groningen, Zernikelaan 25, 9747AA, Groningen, The Netherlands
2
INFN Laboratori Nazionali del Sud, via S. Sofia 62, 95125, Catania, Italy
3
Konan University, 8 Chome-9-1 Okamoto, Higashinada Ward, Kobe, Hyōgo, Japan
4
Institüt für Kernphysik, Universität Münster, 48341, Munster, Germany
5
Dipartimento di Fisica e Astronomia ‘Ettore Majorana’, Catania University, via S. Sofia 64, 95125, Catania, Italy
6
Dipartimento di Fisica, Universitá degli Studi di Milano, Via Celoria 16, 20133, Milan, Italy
7
INFN, Sezione di Milano, Via Celoria 16, 20133, Milan, Italy
8
Institut für Kernphysik, Universität zu Köln, Albertus-Magnus-Platz, Cologne, 50923, Germany
9
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka, 567-0047, Japan
10
School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China
11
ELI-NP, Horia Hulubei National Institute for Physics and Nuclear Engineering, 30 Reactorului Street, Măgurele, 077125, Bucharest, Romania
12
Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289, Darmstadt, Germany
13
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, 48824-1321, USA
14
Department of Physics and Astronomy, Michigan State University, East Lansing, MI, 48824, USA
15
Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI, 48824, USA
16
Institut für Kern-und Teilchenphysik, TU Dresden, Dresden, Germany
* e-mail: c.a.douma@rug.nl
Received:
10
July
2019
Accepted:
17
November
2019
Published online:
11
February
2020
The Gamow–Teller strength distributions of and were measured with the 
charge-exchange reactions at 
. The measurements were carried out at the Research Center for Nuclear Physics (RCNP) at Osaka University in Osaka, Japan using the Grand Raiden spectrometer. The data were analysed by Multipole-Decomposition Analysis (MDA). The Gamow–Teller strengths summed up to 
are 
and 
of the Ikeda sum rule for and , respectively, if the quasi-free scattering (QFS) contribution is not subtracted. These percentages are 
and 
, respectively, if the QFS contribution is maximally subtracted. These results were compared to those from previous measurements of the same isotopes, to recent measurements of 
, and to a Quasi-particle Random-Phase Approximation (QRPA) calculation with Quasi-Particle Vibration Coupling (QPVC). The data suggest that the true QFS contribution is small for , but are inconclusive about whether the QFS contribution is small or significant for . Therefore, these data may provide an interesting test for the general quenching phenomenon of the Gamow–Teller Resonance (GTR). However, more research to reveal the nature of the QFS contribution is still needed on both the experimental and the theoretical side.
© The Author(s), 2020
