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1. Chronology of the three-body dissociation of $^8$He

Author

Thomas Nilsson, N. Curtis, Alain Ninane, L. Stuttge, V. Bouchat, Martin Freer, W. N. Catford, Thomas Materna, F. M. Marqués, C. N. Timis, Steven Pain, V. Kinnard, P. McEwan, María José García Borge, B. Laurent, M. Labiche, E. V. Prokhorova, N. A. Orr, C. Angulo, N. M. Clarke, N. I. Ashwood, Francis Hanappe, G. Normand, 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-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), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, nucl-th, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Gaussian, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Dissociation (chemistry), Nuclear Theory (nucl-th), symbols.namesake, 0103 physical sciences, Phenomenological model, Nuclear Physics - Experiment, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Nuclear theory, Physics, Spacetime, 010308 nuclear & particles physics, Breakup, Nuclear Physics - Theory, symbols, Atomic physics, Ground state
Abstract

7 pags., 5 figs., 1 app., The space and time configurations of the dissociation of He into He+n+n, on C and Pb targets, have been explored simultaneously for the first time. The final-state interactions in the n-n and He-n channels are successfully described within a model that considers independent emission of neutrons from a Gaussian volume with a given lifetime. The dissociation on C target exhibits a dominant sequential decay through the ground state of He, consistent with neutrons being emitted from a Gaussian volume of fm with a n-n delay in the sequential channel of 1400 400 fm/c, in agreement with the lifetime of He. The lower-statistics data on Pb target correspond mainly to direct breakup, and are well described using the n-n volume measured, without any n -n delay. The validity of the phenomenological model used is discussed., The support provided by the technical staff of LPC and the LISE crew is gratefully acknowledged, as are the efforts of the GANIL cyclotron operation team for providing the primary beam. We also wish to express our appreciation for the vital contributions made by our late colleague and friend Jean-Marc Gautier to all the CHARISSA+DEMON experiments undertaken by our collaboration.

Published
2019
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2. How sharp is the transition into the $N=20$ island of inversion for the Mg isotopes ?

Author

M. Caamaño, Martin Freer, J Brown, B. Laurent, W. N. Catford, F. Negoita, Marina Petri, G. L. Wilson, N. L. Achouri, A. O. Macchiavelli, Alfredo Poves, Naofumi Tsunoda, B. Pietras, M. Staniou, L. Gaudefroy, E. S. Paul, J. S. Thomas, Stefanos Paschalis, Franck Delaunay, Marielle Chartier, N. I. Ashwood, N. A. Orr, J. C. Angélique, S. Franchoo, Roy Crawford Lemmon, Sebastian Heil, A. Banu, M. Labiche, P. Roussel-Chomaz, Takaharu Otsuka, N. Patterson, B. Bastin, L. Trache, R. Borcea, B. Fernández-Domínguez, Michael Taylor, C. Rodriguez-Tajes, 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), 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), 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), Normandie Université (NU)-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 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)

Subjects
Physics, History, Isotope, 010308 nuclear & particles physics, Island of inversion, SHELL model, Parity (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computer Science Applications, Education, Low energy, 0103 physical sciences, Atomic physics, 010306 general physics
Abstract

International audience; The N=20 island of inversion is an excellent playground for testing shell model calculations. The Mg chain is a region of shell evolution still far from being well understood. In this paper we present preliminary results of a single-neutron knockout experiment from 31Mg performed at GANIL to study the structure of 31Mg and of the core 30Mg. The level scheme and longitudinal momentum distributions were mesured and spectroscopic factors were deduced. Negative parity states arise at low energy and the spectroscopic factor for the isomeric in 30Mg was determined to be smaller than foreseen in the standard picture. The preliminary experimental results are compared to state-of the art shell model calculations revealing opposed interpretations.

Published
2017
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3. Elastic scattering of $^{8}$He + $^{4}$He and two-neutron transfer and the influence of resonances in $^{12}$Be

Author

Riccardo Raabe, W. N. Catford, N. Curtis, C. Wheldon, H. Al Falou, J. S. Thomas, N. A. Orr, Martin Freer, T. Munoz-Britton, Franck Delaunay, F. M. Marqués, Neven Soić, N. I. Ashwood, N. L. Achouri, V. A. Ziman, 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and 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)

Subjects
Elastic scattering, Physics, Excitation function, Nuclear and High Energy Physics, Molecular states, 010308 nuclear & particles physics, Scattering, Resonance, Halo nucleus, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, lcsh:QC1-999, Nuclear clustering, Light nuclei, 0103 physical sciences, Cluster (physics), Neutron, Atomic physics, 010306 general physics, Excitation, lcsh:Physics
Abstract

Scattering of 8He from 4He has been performed through the coincident detection of the scattered particles using a silicon array within a helium-4 gas volume with a 8He beam. This permitted the reconstruction of the interaction probability as a function of position within the gas and hence the excitation function to be calculated together with the angular distribution of the products. These measurements also enabled the reconstruction of the two-neutron transfer to 6He + 6He. The measurements provide the first characterisation of the scattering of the α+4n, 8He, halo nucleus from 4He and the 2n-transfer to populate the symmetric final state. The results indicate the presence of a L=4 component at excitation energies of 14–15 MeV, consistent with a broad (∼1 MeV) Jπ=4+ resonance. These measurements would agree with generalized two-centre cluster model (GTCM) calculations indicating a cluster, or molecular, structure predicted at this energy. ispartof: Physics Letters B vol:775 pages:58-62 status: published

Published
2017
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4. Coulomb dissociation of $^{20,21}$N

Author

A. Estrade, G. Burgunder, Andreas Martin Heinz, Andreas Wagner, Enrique Casarejos, Roy Crawford Lemmon, C. Wimmer, Ethan Uberseder, M. Heine, T. Le Bleis, N. Kurz, H. O. U. Fynbo, Olof Tengblad, D. Cortina-Gil, V. Stoica, F. Farinon, L. Atar, D. Yakorev, Joachim Enders, Helmut Weick, Z. Elekes, Carlos A. Bertulani, J. Sanchez del Rio Saez, Håkan T Johansson, Daniel Bemmerer, M. Freudenberger, D. Galaviz, Mikhail V. Zhukov, Heiko Scheit, Herbert A. Simon, A. Ignatov, P. Diaz-Fernandez, Nasser Kalantar-Nayestanaki, C. Wheldon, Thomas Aumann, P. Velho, J. Van de Walle, K. Riisager, Pavel Golubev, U. Datta Pramanik, J. Taylor, J. Marganiec, G. L. Wilson, Ralf Plag, J. Benlliure, O. Lepyoshkina, Marielle Chartier, N. I. Ashwood, A. Movsesyan, M. Röder, Andreas Zilges, Yasuhiro Togano, P. J. Woods, Ronja Thies, S. Pietri, R. Kanungo, Kai Zuber, Najafi, M. Labiche, M. J. G. Borge, Thomas Nilsson, A. Prochazka, G. Ribeiro, Christoph Langer, Ángel Perea, Roman Gernhäuser, G. Ickert, T. Adachi, R. Crespo, K. Boretzky, J. S. Winfield, W. N. Catford, G. Rastrepina, H. Alvarez-Pol, Bo Jakobsson, M. Barr, L. M. Fraile, C. Nociforo, F. Wamers, Rahaman, M. V. Ricciardi, M. Mostazo Caro, Björn Jonson, T. Kröll, Y. Aksyutina, Vladimir Avdeichikov, R. Knöbel, Matthias Heil, C. Caesar, B. Streicher, Joakim Cederkäll, J. Hagdahl, J. Kurcewicz, Deniz Savran, M. Caamaño, V. Volkov, Satoru Terashima, M. Holl, O. Ershova, Kathrin Göbel, A. Henriques, Martin Freer, J. Alcantara, Jorge Machado, Marina Petri, D. M. Rossi, Tanja Heftrich, S. Chakraborty, Mario Weigand, Simon Lindberg, R. Krücken, D. Gonzalez Diaz, Catherine Rigollet, Hans Geissel, Rene Reifarth, O. Sorlin, L. V. Chulkov, I. Dillmann, Stefanos Paschalis, V. Panin, S. Altstadt, S. Beceiro, A. Kelic-Heil, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), 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), and 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)

Subjects
Physics, Light nucleus, 010308 nuclear & particles physics, Thermonuclear reaction, Aucun, FOS: Physical sciences, chemistry.chemical_element, Detailed balance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Dissociation (chemistry), Ion, chemistry, 0103 physical sciences, Coulomb, Fluorine, Nuclear Experiment (nucl-ex), Atomic physics, 010306 general physics, Nuclear Experiment, Excitation
Abstract

International audience; Neutron-rich light nuclei and their reactions play an important role for the creation of chemical elements. Here, data from a Coulomb dissociation experiment on $^{20,21}$N are reported. Relativistic $^{20,21}$N ions impinged on a lead target and the Coulomb dissociation cross section was determined in a kinematically complete experiment. Using the detailed balance theorem, the $^{19}\mathrm{N}(\mathrm{n},\gamma)^{20}\mathrm{N}$ and $^{20}\mathrm{N}(\mathrm{n},\gamma)^{21}\mathrm{N}$ excitation functions and thermonuclear reaction rates have been determined. The $^{19}\mathrm{N}(\mathrm{n},\gamma)^{20}\mathrm{N}$ rate is up to a factor of 5 higher at $T

Published
2016
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5. High multiplicity α-particle breakup measurements to study α-condensate states

Author

A. Pagano, G. Cardella, G. Lanzalone, Antonio Trifiro, L. Quattrocchi, Giuseppe Verde, S. Pirrone, P. Russotto, Ivano Lombardo, I. Stefan, S. Norella, C. Wheldon, M. Trimarchi, Tz. Kokalova, S. De Luca, M Assie, F. Rizzo, E. V. Pagano, E. De Filippo, Martin Freer, D. Dell'Aquila, N. S. Martorana, J. Bishop, S. Bailey, G. Politi, N. Curtis, B. Gnoffo, L. Francalanza, Mariano Vigilante, Robin Smith, Luis Acosta, Michele Papa, 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), 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), Bishop, J., Kokalova, Tz, Freer, M., Assie, M., Acosta, L., Bailey, S., Cardella, G., Curtis, N., De Filippo, E., Dell'Aquila, D., De Luca, S., Francalanza, L., Gnoffo, B., Lanzalone, G., Lombardo, I., Martorana, N., Norella, S., Pagano, A., Pagano, E. V., Papa, M., Pirrone, S., Politi, G., Rizzo, F., Russotto, P., Quattrocchi, L., Smith, R., Stefan, I., Trifirò, A., Trimarchì, M., Verde, G., Vigilante, M., and Wheldon, C.

Subjects
Physics, History, 010308 nuclear & particles physics, Solid angle, Alpha particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, 01 natural sciences, Charged particle, Particle identification, Computer Science Applications, Education, Nuclear physics, Physics and Astronomy (all), 0103 physical sciences, Energy dissipation, Beam energies, Condensed state, Excitation regime, High multiplicity, High-solids, Particle breakup, Particle identifications, Particle multiplicity, Particles (particulate matter), Multiplicity (chemistry), 010306 general physics, Excitation, Beam (structure)
Abstract

International audience; An experiment was performed to investigate α-condensate states via high α-particle multiplicity breakup. The nucleus of interest was (28)Si therefore to measure multiplicity 7 particle breakup events, a highly granular detector with a high solid angle coverage was required. For this purpose, the CHIMERA and FARCOS detectors at INFN LNS were employed. Particle identification was achieved through ΔE-E energy loss. The α-particle multiplicity was measured at three beam energies to investigate different excitation regimes in (28)Si. At a beam energy where the energy is sufficient to provide the 7 α-particles with enough energy to be identified using the ΔE-E method, multiplicity 7 events can be seen. Given these high multiplicity events, the particles can be reconstructed to investigate the breakup of α-condensate states. Analysing the decay paths of these states can elucidate whether the state of interest corresponds to a non-cluster, clustered or condensed state.

Published
2016
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6. The thick target inverse kinematics technique with a large acceptance silicon detector array

Author

L. Grassi, N. I. Ashwood, N. A. Orr, B. Fernández-Domínguez, Martin Freer, L. Achouri, N. Curtis, L. Prepolec, M Marqués, V. Tokić, Franck Delaunay, C. Wheldon, Valentina Scuderi, W. N. Catford, Neven Soić, Tz. Kokalova, I. C. Celik, J. Walshe, 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), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Elastic scattering, History, 010308 nuclear & particles physics, business.industry, Scattering, Detector, elastic scattering, thick gas target, Ne-24, alpha, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Particle detector, Computer Science Applications, Education, Semiconductor detector, Cross section (physics), Optics, 0103 physical sciences, Measuring instrument, 010306 general physics, business, Beam (structure)
Abstract

International audience; An experimental technique for studying elastic scattering using a thick gas target is described, with a measurement of the α((24)Ne,α) reaction used as an example. Advantages such as ease, detector efficiency, and the possibility of measuring the cross section at 180° in the centre-of-mass are discussed. It is shown that a resolution of tens of keV is practical at zero degrees, and that the dominant contribution to the resolution for large angles is angular straggling of the beam in the entrance window. The use of helium gas as the target allows direct measurement of a-cluster states.

Published
2014
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7. Study of states in 14C via the 10Be(4He,4He)10Be reaction

Author

Martin Freer, C. Wheldon, S. M. Brown, G. L. Wilson, N. L. Achouri, W. N. Catford, T. Munoz-Britton, Neven Soić, N. I. Ashwood, Kelly Chipps, K Crzywacz-Jones, N. Curtis, Steven D. Pain, D. W. Bardayan, J. D. Malcolm, V. A. Ziman, 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), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
History, Spins, 010308 nuclear & particles physics, Chemistry, 0103 physical sciences, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, Excitation, Beam (structure), Computer Science Applications, Education
Abstract

International audience; A study of the 10Be(4He,4He)10Be reaction has been performed at 10Be beam energies of 25.0, 27.0, 29.0, 32.0, 34.0, 38.0, 40.0, 42.0, 44.0 and 46.0 MeV. The measurements were to explore possible molecular rotational bands in 14C. Three states at excitation energies of Ex = 18.8, 19.76 and 20.66 MeV have been measured and their spins have been determined to be 5−, 5− and 6+, respectively.

Published
2011
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8. Access to resonant states in (24)Mg using the (12)C((13)C,(4)He+(20)Ne)n reaction

Author

Martin Freer, F. Haas, J. D. Malcolm, Neven Soić, N. I. Ashwood, V. A. Ziman, T. Munoz-Britton, M. Barr, Julien Gibelin, G Randisi, N. Curtis, 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), Institut Pluridisciplinaire Hubert Curien (IPHC), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Evaporation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, C-4, law.invention, medicine.anatomical_structure, law, Excited state, 0103 physical sciences, medicine, Neutron, Atomic physics, 010306 general physics, Nucleus, cluster structure, quasi-free reaction, nuclear molecules, Beam (structure)
Abstract

A study of the (12)C((13)C,(20)Ne+alpha)n reaction has been performed at (13)C beam energies of 12.0, 13.5 and 20.0 MeV. The measurements were to explore the extent to which (24)Mg excited states could be populated in a quasi-free (12)C+(12)C ->(20)Ne+alpha reaction in which the last neutron in the (13)C beam acts as a spectator. Excited states in (24)Mg are found at 13.25 (0.20) and 14.25 (0.20) MeV. These states are found to be produced from the neutron evaporation from the (25)Mg compound nucleus. The kinematic region associated with the quasi-free condition is dominated by contaminants from the reactions associated with neutron decay of excited states in (21)Ne populated in the (12)C((13)C,(21)Ne)alpha reaction.

Published
2011
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9. Cluster States in 12C and 14C

Author

S. M. Brown, V. A. Ziman, C. Wheldon, W. N. Catford, P. Papka, R. Neveling, N. Curtis, G. L. Wilson, T. Munoz-Britton, Martin Freer, K. L. Grzywacz‐Jones, Steven D. Pain, H. Fujita, Z. Buthelezi, I. T. Usman, S. M. Perez, Neven Soić, R. W. Fearick, D. W. Bardayan, S. V. Förtsch, J. D. Malcolm, J. A. Swartz, N. L. Achouri, N. I. Ashwood, F. D. Smit, J. Carter, Kelly Chipps, 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), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear and High Energy Physics, Quasielastic scattering, 010308 nuclear & particles physics, Dynamic structure factor, structure of 12C and 14C, cluster states, General Physics and Astronomy, 21.10.Hw, 21.60.Gx, 27.20.+n, Astronomy and Astrophysics, Mott scattering, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Deep inelastic scattering, 01 natural sciences, Resonant inelastic X-ray scattering, X-ray Raman scattering, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, High Energy Physics::Experiment, Scattering theory, Atomic physics, 010306 general physics
Abstract

The cluster structure of 12 C is explored and recent measurements of proton inelastic scattering, suggesting a 2+ state close to 9.6 MeV are presented. Resonant scattering studies of 10 Be + 4 He used to populate resonances in 14 C are briefly discussed.

Published
2010
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10. Structure of the brunnian nucleus $^{10}$C

Author

J. S. Thomas, N. A. Orr, P. Haigh, N. M. Clarke, H. G. Bohlen, Neven Soić, V. A. Ziman, N. L. Achouri, N. Curtis, N. I. Ashwood, W. N. Catford, N. Patterson, Martin Freer, B. Laurent, 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), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, History, 010308 nuclear & particles physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, 01 natural sciences, Computer Science Applications, Education, medicine.anatomical_structure, Excited state, 0103 physical sciences, medicine, Proton emission, Atomic physics, Detector array, 010306 general physics, Nucleon, Nucleus
Abstract

International audience; The 2 ALPHA+ 2p breakup and structure of the only known Brunnian nucleus, 10C, has been studied at 33.3 MeV/nucleon. Detection of the 2ALPHA + 2p breakup fragments using a highly segmented Si-Si-Si-CsI detector array has allowed the 10C -> 9B -> p, 9B -> 8Be + p, 8Be -> ALPHA + ALPHA and 10C -> 6Be + ALPHA, 6Be -> 5Li + p, 5Li -> ALPHA + p decay channels to be reconstructed. Proton emission was seen to be favoured. Resonant breakup was observed from excited states at Ex = 4.20, 5.31 and 6.74 MeV. The previously unobserved state at 4.20 MeV may correspond to a 0+ ALPHA + 2p + ALPHA cluster structure.

Published
2007
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11. Experimental evidence of a $\mathrm{\ensuremath{\nu(1d_{^5/_2})^2} }$ component to the $^{12}$Be ground state

Author

N. M. Clarke, M. Labiche, Alain Ninane, D. Mahboub, N. I. Ashwood, W. N. Catford, Martin Freer, G. Normand, L. Stuttge, F. Hanappe, B. R. Fulton, J. C. Angélique, J. A. Tostevin, S.D. Pain, V. Bouchat, Roy Crawford Lemmon, J. S. Winfield, Neven Soić, N. Curtis, N. A. Orr, V. A. Ziman, C. N. Timis, J.L. Lecouey, 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Component (thermodynamics), Excited state, Hadron, Nuclear fusion, Neutron, Atomic physics, 27.20.+n - 6 <=A <= 19. 24.10.-i - Nuclear reaction models and methods. 25.60.-t - Reactions induced by unstable nuclei. 25.70.-z - Low and intermediate energy heavy-ion reactions, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Ground state
Abstract

Data have been obtained on exclusive single neutron knockout cross sections from 12Be to study its ground state structure. Preliminary cross sections for the first (0.32 MeV, $\ensuremath{^1\!/_2 ^-} $ ) and second (1.78 MeV, $\ensuremath{^5\!/_2 ^+} $ , unbound) excited states in 11Be have been obtained, giving evidence of significant admixtures of both $\ensuremath{\nu(1p_{^1\!/_2})^2} $ and $\ensuremath{\nu(1d_{^5\!/_2})^2} $ configurations in the ground state of $^{12}$Be.

Published
2004
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12. Heavy ion radiative capture: $^{12}$C(^{12}C,\gamma)$

Author

A. H. Wuosmaa, F. Haas, C. J. Lister, P. Fallon, T. L. Khoo, M. P. Carpenter, A. O. Macchiavelli, Martin Freer, T. Lauritsen, S. J. Freeman, A. Görgen, B. R. Fulton, E. F. Moore, J. Pearson, M. A. McMahan, N. Hammond, R. V. F. Janssens, D. G. Jenkins, Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Nuclear physics, Isotope, Nucleosynthesis, Chemistry, Stable isotope ratio, 25.70.Jj, 27.20.+n, 27.30.+t, Gammasphere, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Isotopes of magnesium, Radioactive decay, Spectral line
Abstract

The heavy ion radiative capture reaction 12C(12C,γ) has been investigated around a beam energy of 16 MeV. The total cross‐section has been measured with the Fragment Mass Analyser at Argonne National Laboratory and found to be somewhat larger than has previously been measured. A subsequent measurement with the Gammasphere array has shown that a considerable proportion of this extra cross‐section relates to a highly non‐statistical decay through high‐lying states in 24Mg.

Published
2003
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13. Search for molecular states in $^{16}$C

Author

K. L. Jones, J. L. Lecouey, N. M. Clarke, N. A. Orr, L. Stuttge, L Achouri, P. J. Leask, S. P. G. Chappell, J. C. Angélique, R. Chapman, L. Donadille, B.R. Fulton, C. A. Bremner, S. Grévy, F. Hanappe, M. P. Nicoli, B. Benoit, M. Shawcross, M. B. Smith, R.C. Lemmon, F. M. Marqués, S M Singer, X. Liang, Alain Ninane, E. de Goes Brennard, Martin Freer, M. Lewitowicz, K. M. Spohr, W. N. Catford, 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and 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)

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Crystallography, Helium-4, Isotopes of carbon, Quantum mechanics, Excited state, 0103 physical sciences, Molecule, 010306 general physics, Isotopes of beryllium, Isotopes of helium
Abstract

In order to search for a proposed α:2n:α:2n:α molecular structure in 16C its break-up into 10Be + 6He, 12Be + α, 8He + 2α and 6He + 6He + α has been studied using a 560 MeV 16C beam inelastically excited on a 12C target. States in 16C appear to be only weakly populated in this reaction.

Published
2001
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14. Exotic clustering and Halo states in $^{12,14}$Be

Author

N. A. Orr, Martin Freer, 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), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Nuclear Theory, chemistry.chemical_element, Alpha particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, Charged particle, chemistry, Halo, Atomic physics, Isotopes of beryllium, Nucleon, Nuclear Experiment, Helium, Nuclear Physics
Abstract

The nuclei $^{12}$Be and $^{14}$Be have been investigated using breakup reactions on p, $^{12}$C and $^{208}$Pb targets. The decay of $^{12}$Be into two helium clusters ($^6$He+$^6$He and $^4$He+$^8$He) was observed from a series of excited states between 10 and 25 MeV with spins in the range 4 to 8h, consistent with a deformed “molecular” structure. In the case of $^{14}Be, narrow forward peaked single-neutron angular distributions were were observed for the breakup to $^{12}Be. Analysis of the associated neutron-neutron correlations indicate an RMS separation for the halo neutrons of around 5 fm.

Published
1998
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15. Neutrons from the breakup of $^{19}$C

Author

P. G. Hansen, E. Liegard, M. H. Smedberg, G. Bizard, D. Guillemaud-Mueller, W. N. Catford, F. M. Marqués, B. Heusch, Y. Schutz, M. G. Saint-Laurent, G. Martınez, N. A. Orr, A.C. Mueller, D. D. Warner, F. Hanappe, Björn Jonson, M. Lewitowicz, Thomas Nilsson, Alain Ninane, J. C. Angélique, Leif Axelsson, C. Le Brun, Martin Freer, O. Sorlin, K. Riisager, Göran Hugo Nyman, G. J. Gyapong, L. Stuttge, F. Pougheon, B. Petersen, F. Lefebvres, N. M. Clarke, François-René Lecolley, S. Grévy, G.J. Costa, 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), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), 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 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), 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), Normandie Université (NU)-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), 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 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)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Tantalum, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, 01 natural sciences, Momentum, Nuclear physics, chemistry, Reaction model, 0103 physical sciences, Neutron, Halo, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Beam (structure)
Abstract

Neutrons arising from the breakup of a 30 MeV/nucleon C-19 beam on a tantalum target have been measured using the 98 element array DEMON. A narrow, forward peaked neutron angular distribution, with a corresponding momentum spread considerably smaller than those measured simultaneously for N-21, O-22 and F-24 was observed for charged fragments with Z < Z(proj). Interpreted in terms of the core-breakup reaction model, the results support the existence of a one neutron halo in C-19.

Published
1996
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