CATLIFE (Complementary Arm for Target LIke FragmEnts): Spectrometer for Target like fragments at VAMOS++

The multi-nucleon transfer reaction between 136Xe beam and 198Pt target at the beam energy 7 MeV/u was studied using the large acceptance spectrometer VAMOS++ coupled with the newly installed second arm time-of-flight and delayed $\gamma$-ray spectrometer CATLIFE (Complementary Arm for Target LIke FragmEnts). The CATLIFE detector is composed of a large area multi-wire proportional chamber and the EXOGAM HPGe clover detectors with an ion flight length of 1230 mm. Direct measurement of the target-like fragments (TLF) and the delayed $\gamma$-rays from the isomeric state helps to improve TLF identification. The use of the velocity of TLFs and the delayed $\gamma$-ray demonstrate the proof of principle and effectiveness of the new setup

The ESKSISO diagnostic system intended for assessment of insulating system of the oil-filled equipment

The expert system (ES) intended for assessment of condition of the insulating system of oil-filled transformers has been presented. ES is based on the analysis of the processes of polarization and depolarization proceeding in volume of insulating intervals of the power equipment; it allows to create effectively the conclusion about a condition of controlled object as parameters of control act not so much as characteristics of materials but as characteristics of processes of dielectric designs' aging. A distinctive feature of expert system is the possibility to obtain necessary information about operation parameters defining reliability and duration of work and providing high efficiency of power equipment servic

CATLIFE (Complementary Arm for Target LIke FragmEnts): Spectrometer for Target like fragments at VAMOS++

International audienceThe multi-nucleon transfer reaction between 136Xe beam and 198Pt target at the beam energy 7 MeV/u was studied using the large acceptance spectrometer VAMOS++ coupled with the newly installed second arm time-of-flight and delayed γ-ray spectrometer CATLIFE (Complementary Arm for Target LIke FragmEnts). The CATLIFE detector is composed of a large area multi-wire proportional chamber and the EXOGAM HPGe clover detectors with an ion flight length of 1230 mm. Direct measurement of the target-like fragments (TLF) and the delayed γ-rays from the isomeric state helps to improve TLF identification. The use of the velocity of TLFs and the delayed γ-ray demonstrate the proof of principle and effectiveness of the new setup

CATLIFE (Complementary Arm for Target LIke FragmEnts): Spectrometer for Target like fragments at VAMOS++

The multi-nucleon transfer reaction between 136Xe beam and 198Pt target at the beam energy 7 MeV/u was studied using the large acceptance spectrometer VAMOS++ coupled with the newly installed second arm time-of-flight and delayed γ-ray spectrometer CATLIFE (Complementary Arm for Target LIke FragmEnts). The CATLIFE detector is composed of a large area multi-wire proportional chamber and the EXOGAM HPGe clover detectors with an ion flight length of 1230 mm. Direct measurement of the target-like fragments (TLF) and the delayed γ-rays from the isomeric state helps to improve TLF identification. The use of the velocity of TLFs and the delayed γ-ray demonstrate the proof of principle and effectiveness of the new setup. © 202311Nsciescopu

Multinucleon Transfer Reactions in the 238U+238^{238}\mathrm {U}+{^{238}}U System Studied with the VAMOS+AGATA+ID-Fix

International audienceThe measurement of the production cross sections of exotic neutronrich heavy nuclei, in the uranium region, in the vicinity of the N = 152 deformed shell gap was carried out via multinucleon transfer reactions of 238U + 238U at 7.193 and 6.765 MeV/A using the VAMOS++ magnetic spectrometer coupled to the AGATA and ID-Fix photon detection arrays. This article reports on the status of the VAMOS++ data analysis and results on the population of the strongest (±1n) transfer channels observed from the decay of long-lived products after irradiation

High-Precision Spectroscopy of O 20 Benchmarking Ab Initio Calculations in Light Nuclei

: The excited states of unstable ^{20}O were investigated via γ-ray spectroscopy following the ^{19}O(d,p)^{20}O reaction at 8 AMeV. By exploiting the Doppler shift attenuation method, the lifetimes 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 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 effective field theory 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

High-Precision Spectroscopy of 20{20}O Benchmarking Ab Initio Calculations in Light Nuclei

International audienceHigh-precision spectroscopy of 20O benchmarking ab-initio calculations in light nucleiI. 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,9F. Flavigny,10 A. Lemasson,3 A. Matta,10 D. Ramos,3 M. Rejmund,3 L. Achouri,10 D. Ackermann,3D. Barrientos,11 D. Beaumel,8 G. Benzoni,12 A.J. Boston,13 H.C. Boston,13 S. Bottoni,14, 12 A. Bracco,12, 14D. Brugnara,1, 15 G. de France,3 N. de Sereville,8 F. Delaunay,10 P. Desesquelles,8 F. Didierjean,16C. Domingo-Prato,17 J. Dudouet,18 J. Eberth,19 D. Fern´andez,20 C. Foug`eres,3 A. Gadea,17 F. Galtarossa,8V. Girard-Alcindor,3 V. Gonzales,21 A. Gottardo,1 F. Hammache,8 L.J. Harkness-Brennan,13 H. Hess,19D.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,3C. Lenain,10 S.M. Lenzi,27 S. Leoni,12 H. Li,3 J. Ljungvall,8 J. Lois-Fuentes,20 A. Lopez-Martens,8A. Maj,28 R. Menegazzo,27 D. Mengoni,15, 27 C. Michelagnoli,3, 24 B. Million,12 D.R. Napoli,1 J. Nyberg,29G. Pasqualato,15, 27 Zs. Podolyak,30 A. Pullia,12 B. Quintana,31 F.Recchia,15, 27 D. Regueira-Castro,20 P. Reiter,19K. Rezynkina,32 J.S. Rojo,33 M.D. Salsac,34 E. Sanchis,21 M. S¸enyi˘git,23 M. Siciliano,34, 35 D. Sohler,36O. Stezowski,18 Ch. Theisen,34 A. Utepov,3, 10 J.J. Valiente-Dob´on,1 D. Verney,8 and M. Zielinska341INFN 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, France4Department of Quantum Physics and Astrophysics and Institute of Cosmos Sciences, University of Barcelona, Spain5Technische Universit¨at Darmstadt, Department of Physics, Darmstadt, Germany6ExtreMe Matter Institute, GSI Helmholtzzentrum f¨ur Schwerionenforschung GmbH, Darmstadt, Germany7Max-Planck-Institut f¨ur Kernphysik, Heidelberg, Germany8Universit´e Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France9IFJ PAN, Krakow, Poland.10Universit´e de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen UMR6534, F-14000 Caen, France.11CERN, CH-1211 Geneva 23, Switzerland12INFN Sezione di Milano, I-20133 Milano, Italy13Oliver Lodge Laboratory, The University of Liverpool, Liverpool, UK.14Dipartimento di Fisica, Universit`a di Milano, Milano, Italy15Dipartimento 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, France19Institut f¨ur Kernphysik, Universit¨at zu K¨oln, Z¨ulpicher Str. 77, D-50937 K¨oln, Germany20IGFAE and Dpt. de F´ısica de Part´ıculas, Univ. of Santiago de Compostela, Santiago de Compostela, Spain21Departamento de Ingenier´ıa Electr´onica, Universitat de Valencia, Burjassot, Valencia, Spain22Instituto de Estructura de la Materia, CSIC, Madrid, E-28006 Madrid, Spain23Department of Physics, Faculty of Science, Ankara University, 06100 Besevler - Ankara, Turkey24Institue Laue-Langevin, Grenoble, France.25Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, Istanbul, Turkey.26STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, UK27INFN, Sezione di Padova, I-35131 Padova, Italy.28The Henryk Niewodnicza´nski Institute of Nuclear Physics,Polish Academy of Sciences, 31-342 Krak´ow, Poland29Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden30Department of Physics, University of Surrey, Guildford, GU2 7XH, UK31Laboratorio de Radiaciones Ionizantes, Departamento de F´ısica Fundamental,Universidad de Salamanca, E-37008 Salamanca, Spain32Universit´e de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France33Department of Physics, University of York, York, UK.34Irfu, CEA, Universit´e Paris-Saclay, F-91191 Gif-sur-Yvette, France35Physics Division, Argonne National Laboratory, Lemont (IL) 60439, United States.36Institute for Nuclear Research, Atomki, 4001 Debrecen, HungaryThe excited states of unstable 20O were investigated via γ-ray spectroscopy following the19O(d, p)20O reaction at 8 AMeV. By exploiting the Doppler Shift Attenuation Method, the lifetimeof the 2+2 and 3+1 states were firmly established. From the γ-ray branching and E2/M1 mixing ratiosfor transitions deexciting the 2+2 and 3+1 states, the B(E2) and B(M1) were determined. Variouschiral 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 2similarity renormalization group ab-initio calculations was performed for the first time in a nucleusfar from stability. It was shown that the ab-initio approaches using chiral EFT forces are challengedby detailed high-precision spectroscopic properties of nuclei. The reduced transition probabilitieswere found to be a very constraining test of the performance of the ab-initio model

High-Precision Spectroscopy of 20{20}O Benchmarking Ab Initio Calculations in Light Nuclei

International audienceHigh-precision spectroscopy of 20O benchmarking ab-initio calculations in light nucleiI. 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,9F. Flavigny,10 A. Lemasson,3 A. Matta,10 D. Ramos,3 M. Rejmund,3 L. Achouri,10 D. Ackermann,3D. Barrientos,11 D. Beaumel,8 G. Benzoni,12 A.J. Boston,13 H.C. Boston,13 S. Bottoni,14, 12 A. Bracco,12, 14D. Brugnara,1, 15 G. de France,3 N. de Sereville,8 F. Delaunay,10 P. Desesquelles,8 F. Didierjean,16C. Domingo-Prato,17 J. Dudouet,18 J. Eberth,19 D. Fern´andez,20 C. Foug`eres,3 A. Gadea,17 F. Galtarossa,8V. Girard-Alcindor,3 V. Gonzales,21 A. Gottardo,1 F. Hammache,8 L.J. Harkness-Brennan,13 H. Hess,19D.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,3C. Lenain,10 S.M. Lenzi,27 S. Leoni,12 H. Li,3 J. Ljungvall,8 J. Lois-Fuentes,20 A. Lopez-Martens,8A. Maj,28 R. Menegazzo,27 D. Mengoni,15, 27 C. Michelagnoli,3, 24 B. Million,12 D.R. Napoli,1 J. Nyberg,29G. Pasqualato,15, 27 Zs. Podolyak,30 A. Pullia,12 B. Quintana,31 F.Recchia,15, 27 D. Regueira-Castro,20 P. Reiter,19K. Rezynkina,32 J.S. Rojo,33 M.D. Salsac,34 E. Sanchis,21 M. S¸enyi˘git,23 M. Siciliano,34, 35 D. Sohler,36O. Stezowski,18 Ch. Theisen,34 A. Utepov,3, 10 J.J. Valiente-Dob´on,1 D. Verney,8 and M. Zielinska341INFN 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, France4Department of Quantum Physics and Astrophysics and Institute of Cosmos Sciences, University of Barcelona, Spain5Technische Universit¨at Darmstadt, Department of Physics, Darmstadt, Germany6ExtreMe Matter Institute, GSI Helmholtzzentrum f¨ur Schwerionenforschung GmbH, Darmstadt, Germany7Max-Planck-Institut f¨ur Kernphysik, Heidelberg, Germany8Universit´e Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France9IFJ PAN, Krakow, Poland.10Universit´e de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen UMR6534, F-14000 Caen, France.11CERN, CH-1211 Geneva 23, Switzerland12INFN Sezione di Milano, I-20133 Milano, Italy13Oliver Lodge Laboratory, The University of Liverpool, Liverpool, UK.14Dipartimento di Fisica, Universit`a di Milano, Milano, Italy15Dipartimento 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, France19Institut f¨ur Kernphysik, Universit¨at zu K¨oln, Z¨ulpicher Str. 77, D-50937 K¨oln, Germany20IGFAE and Dpt. de F´ısica de Part´ıculas, Univ. of Santiago de Compostela, Santiago de Compostela, Spain21Departamento de Ingenier´ıa Electr´onica, Universitat de Valencia, Burjassot, Valencia, Spain22Instituto de Estructura de la Materia, CSIC, Madrid, E-28006 Madrid, Spain23Department of Physics, Faculty of Science, Ankara University, 06100 Besevler - Ankara, Turkey24Institue Laue-Langevin, Grenoble, France.25Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, Istanbul, Turkey.26STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, UK27INFN, Sezione di Padova, I-35131 Padova, Italy.28The Henryk Niewodnicza´nski Institute of Nuclear Physics,Polish Academy of Sciences, 31-342 Krak´ow, Poland29Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden30Department of Physics, University of Surrey, Guildford, GU2 7XH, UK31Laboratorio de Radiaciones Ionizantes, Departamento de F´ısica Fundamental,Universidad de Salamanca, E-37008 Salamanca, Spain32Universit´e de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France33Department of Physics, University of York, York, UK.34Irfu, CEA, Universit´e Paris-Saclay, F-91191 Gif-sur-Yvette, France35Physics Division, Argonne National Laboratory, Lemont (IL) 60439, United States.36Institute for Nuclear Research, Atomki, 4001 Debrecen, HungaryThe excited states of unstable 20O were investigated via γ-ray spectroscopy following the19O(d, p)20O reaction at 8 AMeV. By exploiting the Doppler Shift Attenuation Method, the lifetimeof the 2+2 and 3+1 states were firmly established. From the γ-ray branching and E2/M1 mixing ratiosfor transitions deexciting the 2+2 and 3+1 states, the B(E2) and B(M1) were determined. Variouschiral 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 2similarity renormalization group ab-initio calculations was performed for the first time in a nucleusfar from stability. It was shown that the ab-initio approaches using chiral EFT forces are challengedby detailed high-precision spectroscopic properties of nuclei. The reduced transition probabilitieswere found to be a very constraining test of the performance of the ab-initio model