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1. Demonstrator Detection System for the Active Target and Time Projection Chamber (ACTAR TPC) project

Author

B. Osmond, B. Blank, G. Minier, J. Giovinazzo, A.T. Laffoley, T. Goigoux, Tommaso Marchi, H. Alvarez-Pol, P. Konczykowski, J.A. Swartz, Jiecheng Yang, C. Maugeais, J. L. Pedroza, M. Caamaño, P. Sénécal, D. Suzuki, G. Lebertre, F. Saillant, O. Poleshchuk, L. Legeard, B. Raine, Francesca Renzi, G. F. Grinyer, S. Ceruti, P. Rosier, B. Mauss, F. Flavigny, T. Roger, N. Lecesne, E. C. Pollacco, B. Fernández-Domínguez, J. Pancin, Riccardo Raabe, Mathieu Babo, C. Wouters, J. L. Henares, J. Pibernat, J. Daemen, B. Duclos, P. Sizun, G. Wittwer, S. Damoy, 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 Physique Nucléaire d'Orsay (IPNO), 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 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), 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)

Subjects
micromegas, Physics, Nuclear and High Energy Physics, Range (particle radiation), Time projection chamber, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Plane (geometry), Amplifier, Detector, Nuclear physics, MicroMegas detector, 01 natural sciences, Square (algebra), Optics, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Active target, 010306 general physics, business, Instrumentation, Realization (systems)
Abstract

The design, realization and operation of a prototype or “demonstrator” version of an active target and time projection chamber (ACTAR TPC) for experiments in nuclear physics is presented in detail. The heart of the detection system features a micromegas gas amplifier coupled to a high-density pixelated pad plane with square pad sizes of 2 × 2 mm 2 . The detector has been thoroughly tested with several different gas mixtures over a wide range of pressures and using a variety of sources of ionizing radiation including laser light, an α -particle source and heavy-ion beams of 24Mg and 58Ni accelerated to energies of 4.0 MeV/u. Results from these tests and characterization of the detector response over a wide range of operating conditions will be described. These developments have served as the basis for the design of a larger detection system that is presently under construction.

Published
2018
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2. First inverse-kinematics fission measurements in a gaseous active target

Author

P. Konczykowski, C. Rodriguez-Tajes, M. Caamaño, G. Randisi, J. Pancin, F. Boulay, F. Farget, T. Roger, D. Galaviz, Mathieu Babo, B. Fernández-Domínguez, Ismael Martel, A. M. Sánchez-Benítez, Mohsen Harakeh, S. Damoy, L. Acosta, H. Alvarez-Pol, Marine Vandebrouck, P. Teubig, J. Grinyer, Francesca Renzi, G. F. Grinyer, 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), KVI-CART, University of Groningen, University of Groningen [Groningen], Research unit Nuclear & Hadron Physics, 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
Nuclear reaction, Nuclear and High Energy Physics, Fission, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 01 natural sciences, Nuclear physics, ENERGY, MAYA, Nucleosynthesis, 0103 physical sciences, 010306 general physics, Nuclear Experiment, Fusion, DETECTOR, Physics, MULTINUCLEON TRANSFER, Inverse kinematics, 010308 nuclear & particles physics, BEAMS, BARRIER, Nucleon transfer, Uranium-238, Surrogate reactions, ACTINIDES, Active target, Excitation, Beam (structure), SYSTEM
Abstract

The fission of a variety of actinides was induced by fusion and transfer reactions between a U-238 beam and C-12 nuclei, in the active target MAYA. The performance of MAYA was studied, as well as its capability to reconstruct the fission-fragment trajectories. Furthermore, a full characterization of the different transfer reactions was achieved, and the populated excitation-energy distributions were investigated as a function of the kinetic energy in the entrance channel. The ratio between transfer- and fusion-induced fission cross sections was also determined, in order to investigate the competition between both reaction types and its evolution with the incident energy. The experimental results will be discussed with a view to forthcoming radioactive-ion beam facilities, and next-generation active-target setups. (C) 2016 Elsevier B.V. All rights reserved.

Published
2017
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3. A new FEBIAD-type ion source for the upgrade of SPIRAL1 at GANIL

Author

L. Maunoury, Thierry Stora, O. Bajeat, P. Delahaye, P. Jardin, R. Frigot, G. F. Grinyer, J. C. Thomas, C. Leboucher, J Grinyer, M. Dubois, H. Bouzomita, Mathieu Babo, E. Traykov, C. Seiffert, P. Chauveau, 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), European Organization for Nuclear Research (CERN), Institut Pluridisciplinaire Hubert Curien (IPHC), 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), 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 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
010302 applied physics, Nuclear and High Energy Physics, Chemistry, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], FEBIAD, 01 natural sciences, 7. Clean energy, Ion source, Nuclear physics, SPIRAL1, VADIS, Upgrade, 0103 physical sciences, Metallic Ions, Atomic physics, 010306 general physics, Instrumentation, Nominal power (photovoltaic)
Abstract

GANIL/SPIRAL facility/FEBIAD; International audience; The SPIRAL facility at GANIL is being upgraded with a new FEBIAD ion source in order to extend its productioncapabilities to condensable elements. The coupling of such an ion source with the present GANILtarget was recently tested online at SPIRAL at nominal power (1200 W). The results are promising as thecalculated yields are in the range of those extrapolated from previous measurements at lower power andsometimes higher. This experiment and its results are presented.

Published
2016
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4. High-precision half-life measurements of theT=1/2mirrorβdecaysF17andCl33

Author

R. Frigot, Mathieu Babo, J Grinyer, P. Jardin, C. Seiffert, C. Leboucher, M. Dubois, L. Maunoury, P. Chauveau, G. F. Grinyer, H. Bouzomita, J. C. Thomas, E. Traykov, and P. Delahaye

Subjects
Physics, Nuclear and High Energy Physics, Ion beam, 010308 nuclear & particles physics, Order (ring theory), Half-life, 01 natural sciences, Nuclear physics, Matrix (mathematics), Double beta decay, 0103 physical sciences, Matrix element, Beta (velocity), 010306 general physics, Transport system
Abstract

Measurements of the ft values for T=1/2 mirror $\beta$+ decays offer a method to test the conserved vector current hypothesis and to determine Vud, the up-down matrix element of the Cabibbo-Kobayashi-Maskawa matrix. In most mirror decays used for these tests, uncertainties on the ft values are dominated by the uncertainties in the half-lives. Two precision half-life measurements were performed for the T=1/2 $\beta$+ emitters, 17F and 33Cl, in order to eliminate the half-life as the leading source of uncertainty in their ft values. \item[Method] Half-lives of 17F and 33Cl were determined using $\beta$ counting of implanted radioactive ion beam samples on a moving tape transport system at the SPIRAL low energy identification station at GANIL. The 17F half-life result, 64.347~(35) s, precise to $\pm$0.05 %, is a factor of 5 times more precise than the previous world average. The half-life of 33Cl was determined to be 2.5038~(22) s. The current precision of $\pm$0.09 % is nearly 2 times more precise compared to the previous world average. The precision achieved during the present measurements implies that the half-life no longer dominates the uncertainty of the ft values for both T=1/2 mirror decays 17F and 33Cl.

Published
2015
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5. High-precision half-life measurement for the isospinT=1/2mirrorβ+decay ofNa21

Author

G. F. Grinyer, R. Frigot, Mathieu Babo, C. Leboucher, C. Seiffert, P. Jardin, L. Maunoury, M. Dubois, J Grinyer, H. Bouzomita, J. C. Thomas, E. Traykov, P. Chauveau, and P. Delahaye

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Isospin, Double beta decay, Half-life, Standard Model
Abstract

The half-life of the isospin $T=1/2$ mirror ${\ensuremath{\beta}}^{+}$ decay of $^{21}\mathrm{Na}$ was measured at the GANIL-SPIRAL radioactive ion beam facility to be ${T}_{1/2}=22.422$ (10) s, a result that is more than a factor of 5 times more precise than the previous world average, with a resulting $ft$ value that is now two times more precise. The precision of this new result implies that the half-life is no longer the dominant source of uncertainty in the $\mathcal{F}t$ value used in the calculation of ${V}_{\mathrm{ud}}$ from mirror decays to test the conserved vector current hypothesis of the standard model. The value of ${V}_{\mathrm{ud}}$ deduced from mirror decays using the new half-life result is now in better agreement with the ${V}_{\mathrm{ud}}$ derived from $T=1$ superallowed ${0}^{+}$ to ${0}^{+}$ transitions.

Published
2015
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6. A mask for high-intensity heavy-ion beams in the MAYA active target

Author

G. F. Grinyer, C. Rodriguez-Tajes, F. Farget, Bertrand Jacquot, M. Caamaño, Mathieu Babo, J. Pancin, S. Damoy, D. Pérez-Loureiro, D. Ramos, T. Roger, D. Suzuki, 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), Universidade de Santiago de Compostela [Spain] (USC ), Institut de Physique Nucléaire d'Orsay (IPNO), 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, Nuclear and High Energy Physics, Time projection chamber, business.industry, Detector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Charged particle, Particle detector, Heavy beam, Time-projection chamber, Optics, Ionization, Beam mask, Measuring instrument, Physics::Accelerator Physics, Laser beam quality, business, Active target, Instrumentation, High intensity, Beam (structure)
Abstract

Expérience GANIL/CSS1 Cyclotron/MAYA; International audience; The use of high-intensity and/or heavy-ion beams in active targets andt ime-projection chambers isoften limited by the strong ionization produced by the beam.Besides the difficulties associated with thesaturation of the detector and electronics,beam-related signals may hide the hysical events of interestor reduce the detector performance.In addition,space-charge effects may deteriorate the homogeneityof the electric drift field and distort the subsequent reconstruction of particle trajectories.In anticipationof future projects involving such conditions,a dedicated beam mask has been developed and tested inthe MAYA active target.Experimental results with a 136Xe beam a represented.

Published
2014
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