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8 results on '"C. Ducoin"'

1. Excitations of the magic N=50 neutron-core revealed in Ga81

Author

J. Dudouet, A. Lemasson, G. Maquart, F. Nowacki, D. Verney, M. Rejmund, G. Duchêne, O. Stezowski, E. Clément, C. Michelagnoli, A. Korichi, C. Andreoiu, A. Astier, G. de Angelis, G. de France, C. Delafosse, I. Deloncle, F. Didierjean, Z. Dombradi, C. Ducoin, A. Gadea, A. Gottardo, D. Guinet, B. Jacquot, P. Jones, T. Konstantinopoulos, I. Kuti, F. Le Blanc, S. M. Lenzi, G. Li, R. Lozeva, B. Million, D. R. Napoli, A. Navin, R. M. Pérez-Vidal, C. M. Petrache, D. Ralet, M. Ramdhane, N. Redon, C. Schmitt, and D. Sohler

Subjects
Physics, Valence (chemistry), 010308 nuclear & particles physics, Fission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, 01 natural sciences, Ion, 0103 physical sciences, Physics::Atomic and Molecular Clusters, AGATA, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Spectroscopy, Excitation
Abstract

The high-spin states of the neutron-rich Ga81, with three valence protons outside a Ni78 core, were measured. The measurement involved prompt γ-ray spectroscopy of fission fragments isotopically identified using the combination of the variable mode spectrometer (VAMOS++) and the advanced gamma tracking array (AGATA). The new γ-ray transitions, observed in coincidence with Ga81 ions, and the corresponding level scheme do not confirm the high-spin levels reported earlier. The newly observed high-spin states in Ga81 are interpreted using the results of state-of-the-art large-scale shell model (LSSM) calculations. The lower excitation energy levels are understood as resulting from the recoupling of three valence protons to the closed doubly magic core, while the highest excitation energy levels correspond to excitations of the magic N=50 neutron core. These results support the doubly magic character of Ni78 and the persistence of the N=50 shell closure but also highlight the presence of strong proton-neutron correlations associated with the promotion of neutrons across the magic N=50 shell gap, only few nucleons away from Ni78.

Published
2019
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2. Backbending in the pear-shaped Th90223 nucleus: Evidence of a high-spin octupole to quadrupole shape transition in the actinides

Author

M. G. Porquet, Sanna Stolze, Panu Rahkila, Jan Sarén, A. Astier, Paul Greenlees, M. Rousseau, D. Guinet, L. Augey, Panu Ruotsalainen, G. Duchêne, Mikael Sandzelius, A. Lopez-Martens, Paivi Nieminen, D. Curien, Rauno Julin, C. Ducoin, Ulrika Jakobsson, Andrej Herzan, O. Dorvaux, Tuomas Grahn, K. Hauschild, Pauli Peura, Peter B. Jones, F. Azaiez, O. Stezowski, Juha Uusitalo, S. Courtin, G. Maquart, Sami Rinta-Antila, J. Dudouet, Matti Leino, L. Chaix, B. J. P. Gall, A. Vancraeyenest, G. Lehaut, Steffen Ketelhut, N. Redon, Catherine Scholey, I. Deloncle, Juha Sorri, P. Petkov, I. Companis, C. Mancuso, and Sakari Juutinen

Subjects
Physics, Spins, 010308 nuclear & particles physics, Yrast, Nuclear Theory, Actinide, 01 natural sciences, medicine.anatomical_structure, 0103 physical sciences, Quadrupole, medicine, Level structure, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleus, Isotopes of thorium, Spin-½
Abstract

Relatively neutron-rich thorium isotopes lie at the heart of a nuclear region of nuclei exhibiting octupole correlation effects. The detailed level structure of Th223 has been investigated in measurements of γ radiation following the fusion-evaporation channel of the Pb208(O18,3n)Th223 reaction at 85 MeV beam energy. The level structure has been extended up to spin 49/2, and 33 new γ rays have been added using triple-γ coincidence data. The spins and parities of the newly observed states have been confirmed by angular distribution ratios. In addition to the two known yrast bands based on a K=5/2 configuration, a non-yrast band has been established up to spin 35/2. We interpret this new structure as based on the same configuration as the yrast band in Th221 having dominant K=1/2 contribution. At the highest spin a backbending occurs around a rotational frequency of ℏω=0.23 MeV, very close to the one predicted in Th222, where a sharp transition to a reflection-symmetric shape is expected.

Published
2017
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3. High-spin spectroscopy of Ce139

Author

T. Konstantinopoulos, I. Deloncle, A. Gargano, B. Melon, C. M. Petrache, D. Guinet, A. Nannini, S. Kaim, T. Zerrouki, T. Bhattacharjee, C. Ducoin, R. Leguillon, D. Wilmsen, A. Astier, Nunzio Itaco, J.-M. Régis, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Kaim, S., Petrache, C. M., Gargano, A., Itaco, Nunzio, Zerrouki, T., Leguillon, R., Astier, A., Deloncle, I., Konstantinopoulos, T., Regis, J. M., Wilmsen, D., Melon, B., Nannini, A., Ducoin, C., Guinet, D., Bhattacharjee, T., S., Kaim, C. M., Petrache, A., Gargano, T., Zerrouki, R., Leguillon, A., Astier, I., Deloncle, T., Konstantinopoulo, J. M., Régi, D., Wilmsen, B., Melon, A., Nannini, C., Ducoin, D., Guinet, and T., Bhattacharjee

Subjects
Physics, Nuclear and High Energy Physics, Spins, 010308 nuclear & particles physics, Magnetic rotation, Halo nucleus, Parity (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Dipole, 0103 physical sciences, Level structure, Atomic physics, 010306 general physics, Spectroscopy
Abstract

High-spin states in $^{139}\mathrm{Ce}$ have been populated using the $^{130}\mathrm{Te}(^{14}\mathrm{C},5n)$ reaction. The level scheme has been extended to higher spins, including a new band of dipole transitions. The parity of several states has been changed from negative to positive, mainly based on the comparison with the level structure of the core nucleus $^{140}\mathrm{Ce}$ and the results of a realistic shell-model calculation. The dipole band is interpreted as a magnetic rotation band with $\ensuremath{\pi}{h}_{11/2}^{2}\ensuremath{\bigotimes}\ensuremath{\nu}{h}_{11/2}^{\ensuremath{-}1}$ configuration built on small deformation axial shape with $({\ensuremath{\varepsilon}}_{2}=0.12,\ensuremath{\gamma}={0}^{\ensuremath{\circ}})$.

Published
2015
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4. Backbending in the ${}_{90}^{223}\mathrm{Th}$ nucleus: presentation of the consistency of two different experiments

Author

D. Guinet, G. Maquart, L. Chaix, L Augey, I. Companis, A. Astier, N. Redon, C. Ducoin, J Dudouet, C. Mancuso, A Vancraeyenest, O. Stezowski, and G Lehaut

Subjects
Physics, Spins, 010308 nuclear & particles physics, Yrast, Moment of inertia, Condensed Matter Physics, 01 natural sciences, Omega, Atomic and Molecular Physics, and Optics, medicine.anatomical_structure, 0103 physical sciences, medicine, Level structure, Atomic physics, 010306 general physics, Nucleus, Mathematical Physics, Isotopes of thorium, Spin-½
Abstract

The detailed level structure of ${}_{}^{223}\mathrm{Th}$ has been investigated in measurements of γ radiations following the fusion-evaporation channel of the ${}_{}^{208}\mathrm{Pb}{(}_{}^{18}{\rm{O}},3n{)}_{}^{223}\mathrm{Th}$ reaction at 85 MeV beam energy. The present data are extracted from two different experiments performed with the EUROBALL IV and JUROGAM II γ-ray detector array, respectively. The level structure has been extended up to spin $49/2$ and 33 new γ-rays have been added using triple-γ coincidence data. The spins and parities of the newly observed states have been confirmed by angular distribution ratios. In addition to the two known yrast bands based on a $K=5/2$ configuration, a non-yrast band has been established up to spin $35/2$. This observation has brought to light a sharp backbending occuring at the highest spins promoting the ${}^{223}\mathrm{Th}$ as the heavier thorium isotope having an accident observed in its moment of inertia at high spin. We interpret this new structure as based on the same configuration as the yrast band in ${}_{}^{221}\mathrm{Th}$ having dominant $K=1/2$ contribution. At the highest spin a backbending occurs around a rotational frequency of ${\hslash }\omega =0.23\,\mathrm{MeV}$, very close to the one predicted in the ${}_{}^{222}\mathrm{Th}$ where a sharp transition to a reflection-symmetric shape is expected.

Published
2017
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5. Identification of new transitions feeding the high-spin isomers in139Nd and140Nd nuclei

Author

Catherine Scholey, C. Ducoin, D. Curien, O. Stezowski, Markus Nyman, A. Vancraeyenest, Sakari Juutinen, P. Lautesse, Rauno Julin, Peter B. Jones, Steffen Ketelhut, A. Takashima, Pauli Peura, Juha Uusitalo, R. Leguillon, Matti Leino, Juha Sorri, A. Korichi, C. M. Petrache, Ulrika Jakobsson, C. Mancuso, T. Zerrouki, Panu Rahkila, N. Redon, P. Désesquelles, D. Guinet, Panu Ruotsalainen, Jan Sarén, and Paul Greenlees

Subjects
Physics, Nuclear and High Energy Physics, education.field_of_study, 010308 nuclear & particles physics, Population, 01 natural sciences, Recoil, 0103 physical sciences, Atomic physics, 010306 general physics, education, Spin (physics), Energy (signal processing), Excitation
Abstract

The population of the high-spin isomers in ${}^{139}$Nd and ${}^{140}$Nd was investigated using the ${}^{96}$Zr(${}^{48}$Ca,$xn$) reaction and the JUROGAM + RITU + GREAT setup employing the recoil decay tagging technique. Three transitions feeding the 23/2${}^{+}$ isomer in ${}^{139}$Nd and two transitions feeding the 20${}^{+}$ isomer in ${}^{140}$Nd were identified. The newly observed transitions allowed the excitation energy of the isomer to be established in ${}^{139}$Nd and to assign configurations to the states and bands deexcited by the observed transitions in both nuclei.

Published
2013
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6. Spectroscopy of $^{18}$Na: Bridging the two-proton radioactivity of $^{19}$Mg

Author

F. de Oliveira Santos, A. Lefebvre-Schuhl, T. Al Kalanee, C. Borcea, L. Perrot, R. Wolski, K. Subotic, J. C. Angélique, A. M. Sánchez-Benítez, F. Rotaru, Y. H. Lam, T. Davinson, R. Borcea, Predrag Ujić, V. Chudoba, Muriel Fallot, M. Stanoiu, L. Caceres, J. Mrazek, M. Assié, Igor T. Čeliković, Gavin Lotay, F. de Grancey, L. Achouri, C. Ducoin, O. Kamalou, Yu. Sobolev, P. J. Woods, Jürgen Kiener, J. Alcantara-Nunez, M. G. Saint-Laurent, NA Smirnova, D.Y. Pang, I. Stefan, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), CSNSM AS, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Physique théorique (THEORIE), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Excitation function, Elastic scattering, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Scattering, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Isotopes of sodium, 01 natural sciences, 23.50.+z, 24.30.-v, 25.60.Bx, 21.10.Tg, 0103 physical sciences, Nuclear Experiment (nucl-ex), Atomic physics, 010306 general physics, Spectroscopy, Nucleon, Nuclear Experiment, Isotopes of magnesium
Abstract

Expérience GANIL E521aS/SPIRAL; International audience; The unbound nucleus $^{18}$Na, the intermediate nucleus in the two-proton radioactivity of $^{19}$Mg, was studied by the measurement of the resonant elastic scattering reaction $^{17}$Ne(p,$^{17}$Ne)p performed at 4 A.MeV. Spectroscopic properties of the low-lying states were obtained in a R-matrix analysis of the excitation function. Using these new results, we show that the lifetime of the $^{19}$Mg radioactivity can be understood assuming a sequential emission of two protons via low energy tails of $^{18}$Na resonances.

Published
2012
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7. Spectroscopy of the Unbound Nucleus Na-18

Author

J. Kiener, J. Mrazek, M. Stanoiu, Muriel Fallot, M. Assié, Philip Woods, J. C. Angelique, Predrag Ujić, C. Borcea, L. Achouri, F. de Oliveira Santos, F. de Grancey, D.Y. Pang, I. Stefan, F. Rotaru, A. Lefebvre-Schuhl, Igor T. Čeliković, Thomas Davinson, G. L. Lotay, L. Caceres, C. Ducoin, A. M. Sánchez-Benítez, R. Stanoiu, M. G. Saint-Laurent, K. Subotic, Yu. Sobolev, V. Chudoba, R. Wolski, J. Alcantara-Nunez, L. Perrot, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Physique théorique, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), CSNSM AN, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), SPIRAL, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM)

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Scattering, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Isotopes of sodium, 01 natural sciences, medicine.anatomical_structure, Isotopes of neon, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Excited state, 0103 physical sciences, medicine, Atomic physics, 010306 general physics, Spectroscopy, Nucleus
Abstract

The unbound nucleus 18 Na , the intermediate nucleus in the two-proton radioactivity of 19 Mg , is studied through the resonant elastic scattering 17 Ne ( p ,17 Ne ) p . The spectroscopic information obtained in this experiment is discussed and put in perspective with previous measurements and the structure of the mirror nucleus 18 N .

Published
2011
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8. 8Li+α resonant elastic scattering: a tool to study cluster states in 12B

Author

M. Rovituso, A. Di Pietro, Mile Zadro, M. Lattuada, L. Cosentino, C. Maiolino, C. Ducoin, G. Scalia, Michele Papa, A. Musumarra, D. Torresi, Valentina Scuderi, P. Figuera, M. Fisichella, P Descouveont, Domenico Santonocito, E. Strano, and M. G. Pellegriti

Subjects
Physics, Elastic scattering, Excitation function, History, resonant scattering, 8Li-α cluster configurations, 12B, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Scattering, Inelastic scattering, Mott scattering, 01 natural sciences, Computer Science Applications, Education, Time of flight, 0103 physical sciences, Scattering theory, Atomic physics, 010306 general physics, Beam (structure)
Abstract

The 8Li+4He elastic scattering excitation function was measured by using the inverse kinematic thick target method. The 8Li beam was provided by the LNS radioactive facility EXCYT at an energy of 30 MeV and it was delivered into a large scattering chamber filled with 4He gas. The detection system was made by three silicon telescopes and one MCP. This last detector was used to measure the number of incident particles as well as the time of flight allowing for the discrimination between elastic and inelastic scattering. The setup and the experimental technique will be described in details and the results, as well as the comparison of the data with an R-matrix calculation, will be shown and discussed.

Published
2014
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