High-Precision Spectroscopy of ${20}$O Benchmarking Ab Initio Calculations in Light Nuclei
Résumé
High-precision spectroscopy of 20O benchmarking ab-initio calculations in light nuclei
I. Zanon,1, 2 E. Cl´ement,3 A. Goasduff,1 J. Men´endez,4 T. Miyagi,5, 6, 7 M. Assi´e,8 M. Ciemala,9
F. Flavigny,10 A. Lemasson,3 A. Matta,10 D. Ramos,3 M. Rejmund,3 L. Achouri,10 D. Ackermann,3
D. Barrientos,11 D. Beaumel,8 G. Benzoni,12 A.J. Boston,13 H.C. Boston,13 S. Bottoni,14, 12 A. Bracco,12, 14
D. Brugnara,1, 15 G. de France,3 N. de Sereville,8 F. Delaunay,10 P. Desesquelles,8 F. Didierjean,16
C. Domingo-Prato,17 J. Dudouet,18 J. Eberth,19 D. Fern´andez,20 C. Foug`eres,3 A. Gadea,17 F. Galtarossa,8
V. Girard-Alcindor,3 V. Gonzales,21 A. Gottardo,1 F. Hammache,8 L.J. Harkness-Brennan,13 H. Hess,19
D.S Judson,13 A. Jungclaus,22 A. Ka¸ska¸s,23 Y.H. Kim,24 A. Ku¸so˘glu,25 M. Labiche,26 S. Leblond,3
C. Lenain,10 S.M. Lenzi,27 S. Leoni,12 H. Li,3 J. Ljungvall,8 J. Lois-Fuentes,20 A. Lopez-Martens,8
A. Maj,28 R. Menegazzo,27 D. Mengoni,15, 27 C. Michelagnoli,3, 24 B. Million,12 D.R. Napoli,1 J. Nyberg,29
G. Pasqualato,15, 27 Zs. Podolyak,30 A. Pullia,12 B. Quintana,31 F.Recchia,15, 27 D. Regueira-Castro,20 P. Reiter,19
K. Rezynkina,32 J.S. Rojo,33 M.D. Salsac,34 E. Sanchis,21 M. S¸enyi˘git,23 M. Siciliano,34, 35 D. Sohler,36
O. Stezowski,18 Ch. Theisen,34 A. Utepov,3, 10 J.J. Valiente-Dob´on,1 D. Verney,8 and M. Zielinska34
1INFN Laboratori Nazionali di Legnaro, Legnaro, Italy.
2Dipartimento di Fisica e Scienze della Terra, Universit`a di Ferrara, Ferrara, Italy.
3Grand Acc´el´erateur National d’Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France
4Department of Quantum Physics and Astrophysics and Institute of Cosmos Sciences, University of Barcelona, Spain
5Technische Universit¨at Darmstadt, Department of Physics, Darmstadt, Germany
6ExtreMe Matter Institute, GSI Helmholtzzentrum f¨ur Schwerionenforschung GmbH, Darmstadt, Germany
7Max-Planck-Institut f¨ur Kernphysik, Heidelberg, Germany
8Universit´e Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
9IFJ PAN, Krakow, Poland.
10Universit´e de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen UMR6534, F-14000 Caen, France.
11CERN, CH-1211 Geneva 23, Switzerland
12INFN Sezione di Milano, I-20133 Milano, Italy
13Oliver Lodge Laboratory, The University of Liverpool, Liverpool, UK.
14Dipartimento di Fisica, Universit`a di Milano, Milano, Italy
15Dipartimento di Fisica, Universit`a di Padova, Padova, Italy.
16Universit´e de Strasbourg, IPHC, Strasbourg, France.
17Instituto de Fisica Corpuscolar, CSIC-Universidad de Valencia, E-46071 Valencia, Spain.
18Universit´e de Lyon, Universit´e Lyon-1, CNRS/IN2P3,
UMR5822, IP2I, F-69622 Villeurbanne Cedex, France
19Institut f¨ur Kernphysik, Universit¨at zu K¨oln, Z¨ulpicher Str. 77, D-50937 K¨oln, Germany
20IGFAE and Dpt. de F´ısica de Part´ıculas, Univ. of Santiago de Compostela, Santiago de Compostela, Spain
21Departamento de Ingenier´ıa Electr´onica, Universitat de Valencia, Burjassot, Valencia, Spain
22Instituto de Estructura de la Materia, CSIC, Madrid, E-28006 Madrid, Spain
23Department of Physics, Faculty of Science, Ankara University, 06100 Besevler - Ankara, Turkey
24Institue Laue-Langevin, Grenoble, France.
25Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, Istanbul, Turkey.
26STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, UK
27INFN, Sezione di Padova, I-35131 Padova, Italy.
28The Henryk Niewodnicza´nski Institute of Nuclear Physics,
Polish Academy of Sciences, 31-342 Krak´ow, Poland
29Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
30Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
31Laboratorio de Radiaciones Ionizantes, Departamento de F´ısica Fundamental,
Universidad de Salamanca, E-37008 Salamanca, Spain
32Universit´e de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
33Department of Physics, University of York, York, UK.
34Irfu, CEA, Universit´e Paris-Saclay, F-91191 Gif-sur-Yvette, France
35Physics Division, Argonne National Laboratory, Lemont (IL) 60439, United States.
36Institute for Nuclear Research, Atomki, 4001 Debrecen, Hungary
The excited states of unstable 20O were investigated via γ-ray spectroscopy following the
19O(d, p)20O reaction at 8 AMeV. By exploiting the Doppler Shift Attenuation Method, the lifetime
of the 2+
2 and 3+
1 states were firmly established. From the γ-ray branching and E2/M1 mixing ratios
for transitions deexciting the 2+
2 and 3+
1 states, the B(E2) and B(M1) were determined. Various
chiral effective field theory Hamiltonians, describing the nuclear properties beyond ground states,
along with a standard USDB interaction, were compared with the experimentally obtained data.
Such a comparison for a large set of γ-ray transition probabilities with the valence space in medium 2
similarity renormalization group ab-initio calculations was performed for the first time in a nucleus
far from stability. It was shown that the ab-initio approaches using chiral EFT forces are challenged
by detailed high-precision spectroscopic properties of nuclei. The reduced transition probabilities
were found to be a very constraining test of the performance of the ab-initio models
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