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79 results on '"Antonio Villari"'

1. Magnetic Design and Fabrication of Warm-Iron Normal-Conducting Quadrupole Magnets for ReA3 HEBT Line at NSCL

Author: P. Glennon, S. L. Lalitha, Antonio Villari, R. Witgen, and T. Brenton
Subjects: 010302 applied physics, Fabrication, Materials science, 0103 physical sciences, Iron normal, Electrical and Electronic Engineering, Atomic physics, Quadrupole magnet, 01 natural sciences, Electronic, Optical and Magnetic Materials, Line (formation)
Published: 2020

2. Beam thermalization in a large gas catcher

Author: K. Lund, Antonio Villari, Chandana Sumithrarachchi, Stefan Schwarz, Guy Savard, D. J. Morrissey, Ryan Ringle, and Georg Bollen
Subjects: Nuclear and High Energy Physics, Materials science, 010308 nuclear & particles physics, Buffer gas, Separator (oil production), chemistry.chemical_element, Kinetic energy, 01 natural sciences, Ion, Momentum, Nuclear physics, Beamline, chemistry, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Instrumentation, Helium, Beam (structure)
Abstract: Thermalization of fast ions in a buffer gas provides a method to transform the high-energy, exotic beams produced by projectile fragmentation at the National Superconducting Cyclotron Laboratory (NSCL) into low-energy beams. The process includes slowing down the fast exotic beams in solid degraders combined with momentum compression and removal of the remaining kinetic energy by collisions with a buffer gas. The original beam thermalization area for mass measurements at the NSCL was reconfigured to accommodate a new momentum compression beam line, a large radio-frequency (RF) gas catcher constructed by Argonne National Lab and a low-energy beam transport system. A large variety of exotic isotopes produced by projectile fragmentation and selected by the A1900 fragment separator was thermalized in the 1.2 m long gas catcher filled with helium at approximately 100 mbar. The ions were guided to an extraction nozzle with a combination of electrostatic and RF potentials and ejected by the gas flow. A novel RF ion guide was used in a differential pumping system to remove the helium and transport the ions into ultrahigh vacuum. Finally, the ions were accelerated to 30 kV for transport to various experiments. The distribution of the thermalized ions among chemical adducts is one of the operational challenges. The important steps implemented to minimize the production of the chemical adducts in the gas catcher are discussed. The operational status of the facility and some example results from characterization of the gas catcher operation with 37 K and 47 K beams are presented.
Published: 2020

3. Particle-in-Cell Techniques for the Study of Space Charge Effects in the Advanced Cryogenic Gas Stopper

Author: Antonio Villari, Chandana Sumithrarachchi, K. Lund, Ryan Ringle, Catherine Nicoloff, Stefan Schwarz, and Georg Bollen
Subjects: Accelerator Physics (physics.acc-ph), Nuclear and High Energy Physics, Materials science, 010401 analytical chemistry, Nozzle, Buffer gas, chemistry.chemical_element, FOS: Physical sciences, 010402 general chemistry, 01 natural sciences, Space charge, 0104 chemical sciences, Ion, chemistry, Physics - Accelerator Physics, Thermal emittance, Particle-in-cell, Atomic physics, Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation, Helium, Body orifice
Abstract: Linear gas stoppers are widely used to convert high-energy, rare-isotope beams and reaction products into low-energy beams with small transverse emittance and energy spread. Stopping of the high-energy ions is achieved through interaction with a buffer gas, typically helium, generating large quantities of He + /e − pairs. The Advanced Cryogenic Gas Stopper (ACGS) was designed for fast, efficient stopping and extraction of high-intensity, rare-isotope beams. As part of the design process, a comprehensive particle-in-cell code was developed to optimize the transport and extraction of rare isotopes from the ACGS in the presence of space charge, including He + /e − dynamics, buffer gas interactions including gas flow, radio-frequency carpets, and ion extraction through a nozzle or orifice. Details of the simulations are presented together with comparison to experiment when available.
Published: 2020
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4. A technique for the study of (p,n) reactions with unstable isotopes at energies relevant to astrophysics

Author: Ashton Falduto, R. G. T. Zegers, Antonio Villari, Alfredo Estrade, J. S. Randhawa, Sean Liddick, Fernando Montes, Mihai Horoi, Jonathan Sheehan, Kun Wang, Pelagia Tsintari, A. C. Dombos, S. Lipschutz, J. Pereira, Thomas Redpath, Georgios Perdikakis, Stephanie Lyons, P. Gastis, J. Schmitt, Matthew Redshaw, A. Palmisano, G. P. A. Berg, and Mallory Smith
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Spectrometer, Isotope, 010308 nuclear & particles physics, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Nuclear astrophysics, Neutron detection, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Beam (structure), Line (formation)
Abstract: We have developed and tested an experimental technique for the measurement of low-energy (p,n) reactions in inverse kinematics relevant to nuclear astrophysics. The proposed setup is located at the ReA3 facility at the National Superconducting Cyclotron Laboratory. In the current approach, we operate the beam-transport line in ReA3 as a recoil separator while tagging the outgoing neutrons from the (p,n) reactions with the low-energy neutron detector array (LENDA). The developed technique was verified by using the $^{40}$Ar(p,n)$^{40}$K reaction as a probe. The results of the proof-of-principle experiment with the $^{40}$Ar beam show that cross-section measurements within an uncertainty of $\sim$25\% are feasible with count rates up to 7 counts/mb/pnA/s. In this article, we give a detailed description of the experimental setup, and present the analysis method and results from the test experiment. Future plans on using the technique in experiments with the separator for capture reactions (SECAR) that is currently being commissioned are also discussed., Comment: Submitted to NIMA. Revised manuscript after referees' first review
Published: 2020
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5. K38 isomer production via fast fragmentation

Author: T. Baumann, D. Blankstein, Kelly Chipps, Alain Lapierre, Steven D. Pain, Sara Ayoub, Antonio Villari, Konrad Schmidt, Thomas Ginter, S. Jin, Chandana Sumithrarachchi, R. L. Kozub, Fernando Montes, and K. Lund
Subjects: Physics, Nuclear and High Energy Physics, Physics and Astronomy (miscellaneous), Ion beam, 010308 nuclear & particles physics, Nuclear structure, Particle accelerator, Surfaces and Interfaces, 01 natural sciences, law.invention, Fragmentation (mass spectrometry), law, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Atomic physics, Born approximation, 010306 general physics, Ground state, Nucleon, Beam (structure)
Abstract: In radioactive ion beam experiments, beams containing isomers can be of interest in probing nuclear structure and informing astrophysical reaction rates. While the production of mixed in-flight ground state and isomer beams using nucleon transfer can be generally understood through distorted wave Born approximation methodology, low-spin isomer production via fast fragmentation is relatively unstudied. To attain a practical understanding of low-spin isomer production using fast fragmentation beams, a test case of $^{38}\mathrm{K}/^{38m}\mathrm{K}$ was studied at the National Superconducting Cyclotron Laboratory's ReAccelerated Beam facility. Starting from lise++ predictions, the fragmentation momentum distribution was sampled to determine isomer production. In addition, the effects of the gas stopper gradient and charge breeding times were examined. In the case of $^{38}\mathrm{K}$, isomer production peaks at $\ensuremath{\sim}57%$. This maximum is observed just off the lise++ predicted optimum magnetic rigidity, with only small losses in beam intensity within a few percent of this optimum rigidity setting. Control of the isomer fraction was also achieved through the modification of charge breeding times. Fast fragmentation appears to be a feasible method for production of low-spin isomeric beams, but additional study is necessary to better describe the mechanism involved.
Published: 2018

6. The NSCL cyclotron gas stopper – Entering commissioning

Author: J. J. Das, C. Magsig, Stefan Schwarz, Chandana Sumithrarachchi, Al Zeller, J. Ottarson, Shailendra Chouhan, Georg Bollen, David J. Morrissey, Michael A. Green, and Antonio Villari
Subjects: Cryostat, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Cyclotron, chemistry.chemical_element, Field strength, Superconducting magnet, 01 natural sciences, law.invention, Nuclear physics, chemistry, law, Magnet, 0103 physical sciences, Atomic physics, 010306 general physics, Instrumentation, Beam (structure), Helium
Abstract: Linear gas stopping cells have been used successfully at NSCL to slow down ions produced by projectile fragmentation from the 100 MeV/u to the keV energy range. These ‘stopped beams’ have first been used for low-energy high precision experiments and more recently for NSCLs re-accelerator ReA. A gas-filled reverse cyclotron is currently under construction by the NSCL to complement the existing stopping cells: Due to its extended stopping length, efficient stopping and fast extraction is expected even for light and medium-mass ions, which are difficult to thermalize in linear gas cells. The device is based on a 2.6 T maximum-field cyclotron-type magnet to confine the injected beam while it is slowed down in ≈100 mbar of LN2-temperature helium gas. Once thermalized, the beam will be transported to the center of the device by a traveling-wave RF-carpet system, extracted along the symmetry axis with an ion conveyor and miniature RF-carpets, and accelerated to a few tens of keV of energy for delivery to the users. The superconducting magnet has been constructed on a 60 kV platform and energized to its nominal field strength. The magnet’s two cryostats use 3 cryo-refrigerators each and liquid-nitrogen cooled thermal shields to cool the coil pair to superconductivity. This concept, chosen not to have to rely on external liquid helium, has been working well. Measurements of axial and radial field profiles confirm the field calculations. The individual RF-ion guiding components for low-energy ion transport through the device have been tested successfully. The beam stopping chamber with its 0.9 m-diameter RF carpet system and the ion extraction system are being prepared for installation inside the magnet for low-energy ion transport tests.
Published: 2016

7. Use of beam probes for rigidity calibration of the A1900 fragment separator

Author: Marc Hausmann, F. Farinon, Mauricio Portillo, J. Stetson, O. Naviliat Cuncic, Chandana Sumithrarachchi, Antonio Villari, Thomas Baumann, E. Kwan, S. J. Williams, T. N. Ginter, and A. M. Rogers
Subjects: Nuclear and High Energy Physics, Rigidity (electromagnetism), Superconducting cyclotron, Optics, Classical mechanics, Dipole magnet, business.industry, Chemistry, Magnetic components, Astrophysics::Instrumentation and Methods for Astrophysics, Separator (oil production), business, Instrumentation
Abstract: Use of a beam-based approach is presented for establishing a rigidity calibration for the A1900 fragment separator located at the National Superconducting Cyclotron Laboratory. Also presented is why an alternative approach to the rigidity calibration – using detailed field maps of individual magnetic components – is not a feasible basis for deriving an accurate calibration. The level of accuracy achieved for the rigidity calibration is ±0.1%.
Published: 2016
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8. Precision mass measurements of $^{44}$V and $^{44m}$V for nucleon-nucleon interaction studies

Author: R. Sandler, Ryan Ringle, C. Izzo, I. T. Yandow, M. Eibach, Georg Bollen, Adrian Valverde, A. Hamaker, Antonio Villari, Stefan Schwarz, K. Gulyuz, J. Surbrook, Maxime Brodeur, Peter Schury, Nadya Smirnova, Chandana Sumithrarachchi, D. Puentes, S. M. Lenzi, Matthew Redshaw, M. MacCormick, 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), and 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)
Subjects: Physics, 44-vanadium, Nuclear and High Energy Physics, Radionuclide, 010308 nuclear & particles physics, Nuclear shell model, Penning trap mass spectrometry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Condensed Matter Physics, Mass spectrometry, Penning trap, 01 natural sciences, Atomic and Molecular Physics, and Optics, Nuclear physics, Interaction studies, Superconducting cyclotron, 0103 physical sciences, Nuclide, Physical and Theoretical Chemistry, 010306 general physics, Nucleon
Abstract: International audience; We discuss the motivation and technique of Penning trap mass spectrometry applied to radioactive$^{44}$V and$^{44}^{m}$V, using the LEBIT 9.4 T Penning trap mass spectrometer at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University. A complementary measurement of these nuclides, performed at the CSRe in Lanzhou, China, was recently published, but with errors several times larger than obtainable for a short-lived radionuclide in a Penning trap. Interpretation of the higher precision results is ongoing and a full accounting of this measurement is anticipated in the coming months.
Published: 2018

9. First two operational years of the electron-beam ion trap charge breeder at the National Superconducting Cyclotron Laboratory

Author: S. Nash, K. Lund, M. Steiner, Stefan Schwarz, Georg Bollen, S. J. Williams, Qiang Zhao, Antonio Villari, L. E. Linhardt, R. Ringle, Alain Lapierre, S. W. Krause, R. Rencsok, Dan Crisp, Chandana Sumithrarachchi, and T. Summers
Subjects: Physics, Nuclear and High Energy Physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Charge (physics), Surfaces and Interfaces, 01 natural sciences, Ion, Superconducting cyclotron, Breeder (animal), 0103 physical sciences, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Sensitivity (control systems), Ion trap, Atomic physics, 010306 general physics, Beam (structure), Electron beam ion trap
Abstract: The electron-beam ion trap (EBIT) charge breeder of the ReA post-accelerator, located at the National Superconducting Cyclotron Laboratory (Michigan State University), started on-line operation in September 2015. Since then, the EBIT has delivered many pilot beams of stable isotopes and several rare-isotope beams. An operating aspect of the ReA EBIT is the breeding of high charge states to reach high reaccelerated beam energies. Efficiencies in single charge states of more than 20% were measured with ${^{39}\mathrm{K}}^{15+}$, ${^{85}\mathrm{Rb}}^{27+}$, ${^{47}\mathrm{K}}^{17+}$, and ${^{34}\mathrm{Ar}}^{15+}$. Producing high charge states demands long breeding times. This reduces the ejection frequency and, hence, increases the number of ions ejected per pulse. Another operating aspect is the ability to spread the distribution in time of the ejected ion pulses to lower the instantaneous rate delivered to experiments. Pulse widths were stretched from a natural $25\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$ up to $\ensuremath{\sim}70\text{ }\text{ }\mathrm{ms}$. This publication reviews the progress of the ReA EBIT system over the years and presents the results of charge-breeding efficiency measurements and pulse-stretching tests obtained with stable- and rare-isotope beams. Studies performed with high sensitivity to identify and quantify stable-isotope contaminants from the EBIT are also presented, along with a novel method for purifying beams.
Published: 2018

10. Precision mass measurements of neutron-rich Co isotopes beyond N=40

Author: K. Gulyuz, C. Izzo, Maxime Brodeur, S. R. Stroberg, M. Eibach, Stefan Schwarz, R. Ringle, Matthew Redshaw, Antonio Villari, Chandana Sumithrarachchi, J. M. Kelly, Georg Bollen, Adrian Valverde, Jason D. Holt, and R. Sandler
Subjects: Physics, Isotope, 010308 nuclear & particles physics, Nuclear structure, FOS: Physical sciences, Mass spectrometry, Penning trap, 7. Clean energy, 01 natural sciences, Ab initio quantum chemistry methods, 0103 physical sciences, Saturation (graph theory), Neutron, Ion trap, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: The region near Z=28, N=40 is a subject of great interest for nuclear structure studies due to spectroscopic signatures in $^{68}$Ni suggesting a subshell closure at N=40. Trends in nuclear masses and their derivatives provide a complementary approach to shell structure investigations via separation energies. Penning trap mass spectrometry has provided precise measurements for a number of nuclei in this region, however a complete picture of the mass surfaces has so far been limited by the large uncertainty remaining for nuclei with N > 40 along the iron and cobalt chains. Here we present the first Penning trap measurements of $^{68,69}$Co, performed at the Low-Energy Beam and Ion Trap facility at the National Superconducting Cyclotron Laboratory. In addition, we perform ab initio calculations of ground state and two-neutron separation energies of cobalt isotopes with the valence-space in-medium similarity renormalization group approach based on a particular set of two- and three-nucleon forces which predict saturation in infinite matter. We discuss the importance of these measurements and calculations for understanding the evolution of nuclear structure near $^{68}$Ni., 7 pages, 6 figures
Published: 2018

11. Fission fragment yields from heavy-ion-induced reactions measured with a fragment separator

Author: B. M. Sherrill, S. M. Lukyanov, A. M. Amthor, Daniel Bazin, C. Stodel, H. Savajols, B. Blank, L. Caceres, J. Pereira, B. Bastin, Wolfgang Mittig, O. Kamalou, J. C. Thomas, S. Grévy, L. Perrot, O. Delaune, F. Farget, David J. Morrissey, Antonio Villari, Oleg B. Tarasov, M. G. Saint-Laurent, A. Chbihi, B. Fernández-Domínguez, 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), 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 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), 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), 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: Physics, Nuclear reaction, Nuclear and High Energy Physics, Nuclear fission product, Fission products, Isotope, 010308 nuclear & particles physics, Fission, Nuclear Theory, Fission product yield, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Nuclear fusion, Atomic number, 010306 general physics, Nuclear Experiment
Abstract: The systematic study of fission fragment yields under different initial conditions has provided valuable experimental data for benchmarking models of fission product yields. Nuclear reactions using inverse kinematics coupled to the use of a high-resolution spectrometer with good fragment identification are shown here to be a powerful tool to measure the inclusive isotopic yields of fission fragments. In-flight fusion-fission was used in this work to produce secondary beams of neutron-rich isotopes in the collisions of a 238U beam at 24 MeV/u with 9Be and 12C targets at GANIL using the LISE3 fragment separator. Unique identification of the A, Z, and atomic charge state, q, of fission products was attained with the $\Delta E$ -TKE-B $\rho$ -ToF measurement technique. Mass, and atomic number distributions are reported for the two reactions. The results show the importance of different reaction mechanisms in the two cases. The optimal target material for higher yields of neutron-rich high-Z isotopes produced in fusion-fission reactions as a function of projectile energy is discussed.
Published: 2018

12. On-line operation of the EBIT charge breeder of the ReA post-accelerator

Author: Ryan Ringle, Chandana Sumithrarachchi, G. Bollen, L. E. Linhardt, Alain Lapierre, Antonio Villari, Q. Zhao, R. Rencsok, S. J. Williams, K. Lund, T. Summers, Stefan Schwarz, Dan Crisp, S. W. Krause, S. Nash, and M. Steiner
Subjects: Physics, Breeder (animal), Nuclear engineering, Charge (physics), Line (text file)
Published: 2018

13. Investigating the Role of νp-Process: Preparations for the Measurement of the 56Co(p, n)56Ni Reaction

Author: Remco Zegers, Panagiotis Gastis, G. Perdikakis, Stylianos Nikas, Roman Senkov, Carla Fröhlich, Sean Liddick, Mihai Horoi, Fernando Montes, Matthew Redshaw, Antonio Villari, Kathrin Wimmer, Thomas Redpath, A. Spyrou, Antonios Kontos, L. Y. Lin, and Daniel Alt
Subjects: Physics, Chemical engineering, Scientific method
Published: 2017

14. Study of fusion-fission in inverse kinematics with a fragment separator

Author: F. Farget, S. Grévy, A. Chbihi, O. Delaune, L. Perrot, B. M. Sherrill, J. C. Thomas, B. Blank, Daniel Bazin, J. Pereira, C. Stodel, Wolfgang Mittig, Antonio Villari, David J. Morrissey, A. M. Amthor, S. M. Lukyanov, O. Kamalou, B. Fernández-Domínguez, H. Savajols, B. Bastin, L. Caceres, M. G. Saint-Laurent, Oleg B. Tarasov, 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), 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 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), Yu. E. Penionzhkevich, Yu.G. Sobolev, 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 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), 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)
Subjects: Physics, Fission products, Fussion-fission, Inverse kinematics, Isotope, Spectrometer, Fragment separator, Fission, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Collision, LISE, Nuclear physics, Atomic number, GANIL EXP, Nuclear Experiment (nucl-ex), Nuclear Experiment, Beam (structure), LISE++ code, Secondary beams
Abstract: The systematic study of fission fragment yields under different initial conditions provides a valuable experimental benchmark for fission models that aim to understand this complex decay channel and to predict reaction product yields. Inverse kinematics coupled to the use of a high-resolution spectrometer is shown to be a powerful tool to identify and measure the inclusive isotopic yields of fission fragments. In-flight fusion fission was used to produce secondary beams of neutron-rich isotopes in the collision of a 238U beam at 24 MeV/u with 9Be and 12C targets at GANIL using the LISE3 fragment-separator. Unique A,Z,q identification of fission products was attained with the dE-TKE-Brho-ToF measurement technique. Mass, and atomic number distributions are reported for the two reactions that show the importance of different reaction mechanisms for these two targets., Comment: 14 pages, 10 figures, 4 tables
Published: 2017
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15. ECOS-LINCE: A HIGH-INTENSITY HEAVY-ION FACILITY FOR NUCLEAR STRUCTURE AND REACTIONS

Author: Mohsen Harakeh, Peter Ostroumov, Ismael Martel, T. Junquera, A.R. Pinto-Gomez, E. Barrios, Daniel Gordo-Yáñez, J.A. Prieto-Thomas, J.A. Dueñas, A. K. Ordúz, C. Bontoiu, A. Bergillos, R. Carrasco, Antonio Villari, M.J. Ruiz-Pomares, A. M. Sánchez-Benítez, J. Sanchez Segovia, L. Acosta, Antonio Peregrín, [Martel, I.] Univ Huelva, Huelva 21071, Spain, [Bontoiu, C.] Univ Huelva, Huelva 21071, Spain, [Orduz, A. K.] Univ Huelva, Huelva 21071, Spain, [Acosta, L.] Univ Huelva, Huelva 21071, Spain, [Barrios, E.] Univ Huelva, Huelva 21071, Spain, [Carrasco, R.] Univ Huelva, Huelva 21071, Spain, [Duenas, J. A.] Univ Huelva, Huelva 21071, Spain, [Gordo-Yanez, D.] Univ Huelva, Huelva 21071, Spain, [Peregrin, A.] Univ Huelva, Huelva 21071, Spain, [Pinto-Gomez, A. R.] Univ Huelva, Huelva 21071, Spain, [Prieto-Thomas, J. A.] Univ Huelva, Huelva 21071, Spain, [Ruiz-Pomares, M. J.] Univ Huelva, Huelva 21071, Spain, [Junquera, T.] ACS, 86 Rue Paris, F-91400 Orsay, France, [Sanchez-Segovia, J.] Hosp Juan Ramon Jimenez, Huelva 21001, Spain, [Ostroumov, P. N.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA, [Villari, A. C. C.] FRIB, E Lansing, MI USA, [Harakeh, M. N.] Univ Groningen, KVI CART, NL-9747 AA Groningen, Netherlands, [Acosta, L. A.] Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20-364, Mexico City 01000, DF, Mexico, Spanish Government under the grant Feder-Interconnecta 'Aceltec', Alter Technology-Tuv, Avs, Cibernos, Elitt Energy, Faysol, Idom, Tti Norte, and Research unit Nuclear & Hadron Physics
Subjects: Physics, Design studies, Database, Download, Warranty, Fundamental physics, General Physics and Astronomy, Physics::Accelerator Physics, Heavy ion, Permission, computer.software_genre, computer
Abstract: Presented at the XXXIV Mazurian Lakes Conference on Physics, Piaski, Poland, September 6–13, 2015, During the last years, the ECOS working group has been considering the construction of a new high-intensity accelerator of stable ion beams for the next Long-Range Plan of the nuclear physics community in Europe. The new facility (LINCE) will be a multi-user facility dedicated to ECOS science: fundamental physics, astrophysics, nuclear structure and reaction dynamics. In this paper, we summarize preliminary design studies of the low-energy part of this facility based on the use of a multi-ion supercon- ducting linac., Work partially supported by the Spanish Government under the grant Feder-Interconnecta “Aceltec” ITC-20111070. The authors are also grateful to the companies Alter Technology-Tüv, Avs, Cibernos, Elitt Energy, Faysol, Idom, and Tti Norte for partial funding of this work and active participation in the design and prototyping carried-out in this study.
Published: 2016

16. Studies for a 72.75 MHz Four Vanes CW-RFQ for ECOS-LINCE Project

Author: A. K. Ordúz, Alberto Garbayo, C. Bontoiu, Ismael Martel, and Antonio Villari
Subjects: Physics, Nuclear physics, 03 medical and health sciences, 0302 clinical medicine, 010308 nuclear & particles physics, 0103 physical sciences, General Physics and Astronomy, 01 natural sciences, 030218 nuclear medicine & medical imaging
Abstract: Presented at the XXXIV Mazurian Lakes Conference on Physics, Piaski, Poland, September 6–13, 2015., The ECOS is considering the construction of a new facility for accelerating high intensity stable beams with energies at and above the Coulomb barrier, the LINCE light and heavy ion accelerator. This facility could be based on a normal conducting CW-RFQ and a superconducting linac, working at 72.75 MHz. This paper presents a design study for the RFQ system which is able to achieve 500 keV/u output for A=Q = 7 ions in only 5 m length.
Published: 2016

17. Design study of a pre-separator for the LINAG super separator spectrometer

Author: H. Savajols, B. Jacquot, Bela Erdelyi, Antonio Villari, A. Drouart, Jerry Nolen, S. Manikonda, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Argonne National Laboratory [Lemont] (ANL), Northern Illinois University, 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), M. Lion, W. Mittig, O. Naviliat-Cuncic, P. Roussel-Chomaz, A.C.C. Villari, and SPIRAL2
Subjects: Nuclear and High Energy Physics, Spectrometer, Chemistry, Cyclotron resonance, Particle accelerator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Ion source, Electron cyclotron resonance, Linear particle accelerator, Ion, law.invention, Nuclear physics, law, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation, Separator (electricity)
Abstract: International audience; The Super Separator Spectrometer (S3) is a device to be designed for experiments with the very high intensity stable beams of LINAG, the superconducting linear accelerator of GANIL, which will be built in the framework of SPIRAL2. These beams, which will provide in a first phase of SPIRAL2 ions with A/q = 3, can reach intensities exceeding 100 pµA for lighter ones - A
Published: 2008

18. SPIRAL at GANIL: Latest Results and Plans for the Future

Author: M. Dupuis, P. Lehérissier, J. C. Angélique, F. Pellemoine, C. Eleon, R. Alves-Conde, P. Jardin, Marc Dubois, C. Canet, J. C. Thomas, Jean-Yves Pacquet, Antonio Villari, M. G. Saint-Laurent, G. Gaubert, C. Barué, L. Maunoury, R. Leroy, C. Stodel, N. Lecesne, J. L. Flambard, F. Lemagnen, 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), 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), Centre Interdisciplinaire de Recherche Ions Lasers (CIRIL), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Bertulani C.A., Gomes P.R.S., Hussein M.S., Szanto de Toledo A., SPIRAL, 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)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Argon, 010308 nuclear & particles physics, Krypton, chemistry.chemical_element, Noble gas, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Neon, chemistry, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Physics::Accelerator Physics, Physics::Atomic Physics, Nuclear Experiment, 010306 general physics, Spiral, Helium, Beam (structure), Production system
Abstract: International audience; The first accelerated exotic beam of the SPIRAL (Production System of Radioactive Ion and Acceleration On-Line) facility at GANIL at Caen has been delivered for experiments in September 2001. After working for almost 5 years, 32 experiments were performed in the facility using exotic isotopes of helium, oxygen, neon, argon and krypton. The intensities of the radioactive beams increased since the first beam was delivered. Nominal intensity values are achieved for most of noble gas beams. Developments of new beams as well as the increasing of present intensities for a number of isotopes are being undertaken. In particular, in this contribution it is presented the first results obtained for the production of light alkali beams. Other developments are also envisaged in the close future.
Published: 2007

19. Determination of theQECvalues of theT=1/2mirror nucleiNa21andP29at LEBIT

Author: Ryan Ringle, Adrian Valverde, Antonio Villari, Georg Bollen, K. Gulyuz, R. Sandler, Maxime Brodeur, C. Izzo, Chandana Sumithrarachchi, M. Eibach, David J. Morrissey, K. Cooper, Stefan Schwarz, and Matthew Redshaw
Subjects: Physics, Nuclear and High Energy Physics, Mirror nuclei, Atomic physics, Ion trapping
Published: 2015

20. First Direct Determination of the Superallowedβ-DecayQECValue forO14

Author: C. Izzo, David J. Morrissey, Maxime Brodeur, M. Eibach, Adrian Valverde, Richard Bryce, K. Gulyuz, K. Cooper, Matthew Redshaw, Georg Bollen, R. Sandler, Chandana Sumithrarachchi, Stefan Schwarz, Antonio Villari, and Ryan Ringle
Subjects: Physics, 010308 nuclear & particles physics, Double beta decay, 0103 physical sciences, Scalar (mathematics), General Physics and Astronomy, State (functional analysis), Atomic physics, Nuclear Experiment, 010306 general physics, Ground state, 01 natural sciences, Energy (signal processing)
Abstract: We report the first direct measurement of the $^{14}\mathrm{O}$ superallowed Fermi $\ensuremath{\beta}$-decay ${Q}_{EC}$ value, the last of the so-called ``traditional nine'' superallowed Fermi $\ensuremath{\beta}$ decays to be measured with Penning trap mass spectrometry. $^{14}\mathrm{O}$, along with the other low-$Z$ superallowed $\ensuremath{\beta}$ emitter, $^{10}\mathrm{C}$, is crucial for setting limits on the existence of possible scalar currents. The new ground state ${Q}_{EC}$ value, 5144.364(25) keV, when combined with the energy of the ${0}^{+}$ daughter state, ${E}_{x}({0}^{+})=2312.798(11)\text{ }\text{ }\mathrm{keV}$ [, Nucl. Phys. A523, 1 (1991)], provides a new determination of the superallowed $\ensuremath{\beta}$-decay ${Q}_{EC}$ value, ${Q}_{EC}(\mathrm{sa})=2831.566(28)\text{ }\text{ }\mathrm{keV}$, with an order of magnitude improvement in precision, and a similar improvement to the calculated statistical rate function $f$. This is used to calculate an improved $\mathcal{F}t$ value of 3073.8(2.8) s.
Published: 2015

21. Penning trap mass measurement ofBr72

Author: Georg Bollen, C. Izzo, K. Gulyuz, Antonio Villari, Ryan Ringle, David J. Morrissey, Stefan Schwarz, Adrian Valverde, R. Sandler, M. Eibach, Chandana Sumithrarachchi, and K. Cooper
Subjects: Physics, Nuclear and High Energy Physics, Low energy, Ion trap, State (functional analysis), Atomic physics, Penning trap, Ground state, Mass spectrometry, Mass measurement, Atomic mass
Abstract: The Low Energy Beam and Ion Trap (LEBIT) Penning trap mass spectrometer was used to perform an improved-precision mass measurement of $^{72}\mathrm{Br}$ and the low-lying isomeric state, $^{72m}\mathrm{Br},$ giving mass excesses of $\ensuremath{-}59\phantom{\rule{0.16em}{0ex}}062.2(1.0)\phantom{\rule{0.16em}{0ex}}\mathrm{keV}$ and $\ensuremath{-}58\phantom{\rule{0.16em}{0ex}}960.9(1.2)\phantom{\rule{0.16em}{0ex}}\mathrm{keV}$, respectively. These values are consistent with the values from the 2012 atomic mass evaluation [Chin. Phys. C 36, 1603 (2012)] and the Nubase2012 evaluation of nuclear properties [Chin. Phys. C 36, 1157 (2012)]. The uncertainties on the mass of the ground state and isomeric state have been reduced by a factor of seven.
Published: 2015

22. First results at SPIRAL-GANIL

Author: Antonio Villari
Subjects: Nuclear and High Energy Physics, Stripping (chemistry), Spectrometer, 010308 nuclear & particles physics, Chemistry, Cyclotron, 01 natural sciences, 7. Clean energy, Ion source, Electron cyclotron resonance, law.invention, Ion, Nuclear physics, law, 0103 physical sciences, Physics::Accelerator Physics, Irradiation, Atomic physics, 010306 general physics, Instrumentation, Beam (structure)
Abstract: The first accelerated exotic beam of the Production System of Radioactive Ion and Acceleration On-Line (SPIRAL) facility at Grand Accelerateur National d’Ions Lourds, Caen has been delivered for the first experiment in the end of September 2001. The 18Ne (half-live of 1.67 s) isotope has been produced through the projectile fragmentation of a 20Ne primary beam at 95A MeV on a carbon target, located at the new underground production cave of SPIRAL. For this first experiment, a maximum primary beam intensity of 0.18 pμA was used, in order to limit the irradiation of the production ensemble. The radioactive atoms released from the carbon target – heated at 1800 °C – were ionised by the compact and totally permanent magnet Nanogan-3 electron cyclotron resonance ion source to the charge state 4+. The beam was accelerated by the new compact cyclotron for medium energy ions up to the energy of 7A MeV. The maximum beam intensity of 18Ne achieved during this first run was of 2×106 particles per second at the experimental area. The beam was contaminated by 15% of 18O and a very small amount (
Published: 2003

23. Measurement of the differences in the total cross section for antiparallel and parallel longitudinal spins and a measurement of parity nonconservation with incident polarized protons and antiprotons at 200 GeV/c

Author: Tatsushi Shima, N. Tanaka, J. Deregel, M. Nessi, Yu A. Matulenko, Yasar Onel, T. Iijima, P. Chaumette, M. D. Corcoran, A. L. Read, Akira Masaike, Yoshitaka Itow, N. Tamura, Jay Roberts, D. G. Underwood, S. Makino, A. Michalowicz, J. Skeens, O. A. Grachov, VL Rykov, F. Luehring, N. I. Belikov, Fujio Takeutchi, G. Durand, T. Yoshida, D. Grosnick, D. Lopiano, H. En'yo, Y. Ohashi, Kozo Miyake, A. de Lesquen, H. Funahashi, Y. Goto, T. Kasprzyk, S. B. Nurushev, K. Imai, D. Hill, K. Kuroda, K. W. Krueger, J. Cranshaw, David Miller, J. L. White, H. M. Spinka, J. D. Cossairt, V. L. Solovyanov, S. Yamashita, F. Nessi-Tedaldi, G. Pauletta, N. Akchurin, A. A. Derevschikov, T. Nagamine, A. Bravar, J. Bystricky, D. I. Patalakha, P. Shanahan, Ryuichi Takashima, J. Sheppard, L. van Rossum, F. Lehar, Kazuo Iwatani, Antonio Villari, J. Fabre, Robert Stanek, P. Schiavon, Norio Saito, A. P. Meschanin, Andrey Vasiliev, Aldo Penzo, C. Nguyen, G. Salvato, A. Yokosawa, and T. Maki
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Spins, Antiproton, Parity (physics), Atomic physics
Published: 1997

24. Complete isotopic distributions of fragments produced in transfer- and fusion-induced reactions

Author: Enrique Casarejos, O. Kamalou, J. C. Thomas, O. Delaune, M. G. Saint-Laurent, L. Perrot, C. Schmitt, B. Jurado, C.O. Bacri, A. Navin, Wolfgang Mittig, A. M. Amthor, C. Golabek, F. Farget, A. Lemasson, M. Rejmund, H. Savajols, G. Barreau, Oleg B. Tarasov, C. Stodel, L. Caceres, X. Derkx, J. Pereira, M. Caamano, L. Gaudefroy, J. Benlliure, David J. Morrissey, Karl-Heinz Schmidt, B. Bastin, Antonio Villari, Dominique Bazin, L. Audouin, S. Grévy, B. M. Sherrill, S. M. Lukyanov, B. Blank, T. Roger, B. Fernández-Domínguez, 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 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), PANTECHNIK S.A., Pantechnik, F. Farget, A. Chatillon, H. Faust, G. Fioni, D. Goutte, H. Goutte, 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), 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), Universidade de Santiago de Compostela [Spain] (USC ), 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), Aval du cycle et Energie Nucléaire (ACEN), 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Noyaux exotiques (NEX), USC, Universidad de Santiago de Compostela, Universidad Santiago de Compostela, Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and 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)
Subjects: Physics, Fusion, Spectrometer, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract: Expérience GANIL/VAMOS/LISE; International audience; Two fission experiments have been performed at GANIL using 238U beams at different energies and light targets. Different fissioning systems were produced with centre of mass energies from 10 to 240MeV and their decay by fission was investigated with GANIL spectrometers. Fission-fragment isotopic distributions have been obtained. The evolution with impinging energy of their properties, the neutron excess and the width of the neutron-number distributions, gives important insights into the dynamics of the fusionfission mechanism.
Published: 2013

25. Direct Mass Measurements ofB19,C22,F29,Ne31,Na34and Other Light Exotic Nuclei

Author: A. Gillibert, Stefanos Paschalis, B. Fernández-Domínguez, G. Frémont, J. F. Libin, B. Pietras, P. Roussel-Chomaz, W. Mittig, Yu. E. Penionzhkevich, N. A. Orr, V. A. Maslov, Antonio Villari, S. Grévy, P. Gangnant, C. Spitaels, L. Gaudefroy, S. Varet, Marielle Chartier, and J. P. Ebran
Subjects: Physics, Valence (chemistry), Isotope, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, Isotopes of boron, Mass spectrometry, Isotopes of sodium, 7. Clean energy, 01 natural sciences, Isotopes of neon, 0103 physical sciences, Neutron, Halo, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: We report on direct time-of-flight based mass measurements of 16 light neutron-rich nuclei. These include the first determination of the masses of the Borromean drip-line nuclei (19)B, (22)C, and (29)F as well as that of (34)Na. In addition, the most precise determinations to date for (23)N and (31)Ne are reported. Coupled with recent interaction cross-section measurements, the present results support the occurrence of a two-neutron halo in (22)C, with a dominant ν2s(1/2)(2) configuration, and a single-neutron halo in (31)Ne with the valence neutron occupying predominantly the 2p(3/2) orbital. Despite a very low two-neutron separation energy the development of a halo in (19)B is hindered by the 1d(5/2)(2) character of the valence neutrons.
Published: 2012

26. Isotopic fission fragment distributions as a deep probe to fusion-fission dynamics

Author: B. Jurado, M. Rejmund, Antonio Villari, B. M. Sherill, K.-H. Schmidt, Oleg B. Tarasov, B. Blank, A. M. Amthor, J. Pereira, B. Fernández-Domínguez, F. Farget, H. Savajols, A. Lemasson, S. Grévy, G. Barreau, S. M. Lukyanov, D. Bazin, A. Navin, J. Benlliure, L. Audouin, M. G. Saint-Laurent, C. Schmitt, T. Roger, L. Caceres, X. Derkx, Wolfgang Mittig, B. Bastin, O. Delaune, M. Caamaño, C.O. Bacri, E. Casarejos, L. Gaudefroy, C. Stodel, L. Perrot, C. Golabek, J. C. Thomas, O. Kamalou, A. Chibihi, J. Taieb, David J. Morrissey, 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), Aval du cycle et Energie Nucléaire (ACEN), 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), 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), Noyaux exotiques (NEX), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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 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), 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 Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: History, Fission, Nuclear Theory, Shell (structure), Coulomb barrier, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Molecular physics, Education, 0103 physical sciences, medicine, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Fusion, Range (particle radiation), 010308 nuclear & particles physics, Potential energy, Computer Science Applications, medicine.anatomical_structure, Nucleus, Excitation
Abstract: During the fission process, the nucleus deforms and elongates up to the two fragments inception and their final separation at scission deformation. The evolution of the nucleus energy with deformation is determined by the macroscopic properties of the nucleus, and is also strongly influenced by the single-particle structure of the nucleus. The fission fragment distribution is a direct consequence of the deformation path the nucleus has encountered, and therefore is the most genuine experimental observation of the potential energy landscape of the deforming nucleus. Very asymmetric fusion-fission reactions at energy close to the Coulomb barrier, produce well-defined conditions of the compound nucleus formation, where processes such as quasi-fission, pre-equilibrium emission and incomplete fusion are negligible. In the same time, the excitation energy is sufficient to reduce significantly structural effects, and mostly the macroscopic part of the potential is responsible for the formation of the fission fragments. We use inverse kinematics combined with spectrometers to select and identify the fission fragments produced in $^{238}$U+$^{12}$C at a bombarding energy close to and well-above the Coulomb barrier. For the first time, the isotopic yields are measured over the complete atomic-number distribution, between Z=30 and Z=63. The experimental set-up also allows to identify transfer-induced reactions, which lead to low-energy fission where the nuclear shell structure shows a strong influence on the fission-fragment distributions. The resulting set of data gives the possibility to observe the fission fragment properties over a wide range of excitation energy, and they reveal the vanishing of the shell effects in the potential energy of the fissioning nucleus, as well as the influence of fission dynamics., Comment: Invited Plenary Talk given at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS)
Published: 2012

27. Evolution of isotopic fission-fragment yields with excitation energy

Author: M. Rejmund, L. Audouin, B. M. Sherrill, J. C. Thomas, Enrique Casarejos, G. Barreau, Oleg B. Tarasov, M. Caamano, A. M. Amthor, J. Taieb, C.O. Bacri, C. Golabek, H. Savajols, Wolfgang Mittig, C. Schmitt, B. Bastin, David J. Morrissey, X. Derkx, B. Jurado, A. Navin, Antonio Villari, C. Stodel, L. Caceres, L. Perrot, J. Benlliure, F. Farget, A. Lemasson, O. Delaune, O. Kamalou, D. Bazin, T. Roger, B. Fernández-Domínguez, S. Grévy, K.-H. Schmidt, B. Blank, L. Gaudefroy, S. M. Lukyanov, M. G. Saint-Laurent, J. Pereira, J.D Frankland, A. Pagano, S. Pirrone, M.-F Rivet, F. Rizzo, 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 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), PANTECHNIK S.A., Pantechnik, 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-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear reaction, Physics, Isotopes of uranium, Isotope, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Particle detector, Nuclear physics, Uranium-238, Chemical physics, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Neutron, 010306 general physics, Nuclear Experiment, Excitation
Abstract: Expérience GANIL/VAMOS-LISE; International audience; Two fission experiments have been performed at GANIL using 238U beams at different energies and light targets. Different fissioning systems were produced with excitation energies from 10 to 230 MeV and their decay by fission was investigated with GANIL spectrometers. Preliminary fission-fragment isotopic distributions have been obtained. The evolution with impinging energy of their properties, the neutron excess and the width of the neutron-number distributions, gives important insights into the dynamics of fusion-fission mechanism.
Published: 2012

28. Evidence for compensation in a hadron calorimeter by the filtering effect

Author: G. Terzi, G. Salvato, Paolo Giubellino, R. Macii, A. Penzo, Claude Leroy, A. Seidman, M. Pisani, P. G. Rancoita, R. Paludetto, L. Riccati, S. Pensotti, Luciano Ramello, L. Vismara, Antonio Villari, F. Lamarche, C. Furetta, and E. Borchi
Subjects: Physics, Nuclear and High Energy Physics, Silicon, Physics::Instrumentation and Detectors, chemistry.chemical_element, Synchrotron, Spectral line, Particle identification, Particle detector, Calorimeter, law.invention, Semiconductor detector, Nuclear physics, chemistry, law, Measuring instrument, Atomic physics
Abstract: In a calorimeter with silicon readout, operated at the CERN-Proton Synchrotron, the use of a combination of low-Z (Fe) and high-Z (Pb) materials as absorbers allows the transformation of the electron energy distribution of the incident showers in two media with different critical energies via the filtering effect. As a result, a ratio varying from e/π>1 to e/π
Published: 1992

29. High-xT single-spin asymmetry in π0 and η production at xF=0 by 200 GeV polarized antiprotons and protons

Author: A. Matulenko Yu, S. Makino, V. L. Solovyanov, A N. Vasilev, Kozo Miyake, Y. Goto, Fujio Takeutchi, N. Tamura, G. Salvato, Nobuhiko. Saito, J. Cranshaw, VL Rykov, J. D. Cossairt, D. Grosnick, Takashi Maki, H. Funahashi, A. Michalowicz, H. M. Spinka, N. I. Belikov, N. Tanaka, S. B. Nurushev, D. Hill, K. Kuroda, Anna Zanetti, S. Yamashita, Yasar Onel, A. Yokosawa, F. Luehring, F. Nessi-Tedaldi, J. Skeens, M. Laghai, Kazuo Iwatani, D. L. Adams, Antonio Villari, A A. Derevshchikov, A. de Lesquen, T. Yoshida, Akira Masaike, M. D. Corcoran, Ryuichi Takashima, M. Nessi, L. van Rossum, O. A. Grachov, J. Bystricky, G. Pauletta, Y. Ohashi, K W. Krger, Aldo Penzo, T. Nagamine, C. Nguyen, A P. Meshchanin, K. Imai, P. Schiavon, David Miller, D. I. Patalakha, A.L. Read, N. Akchurin, F. Lehar, J. L. White, D. G. Underwood, Jay Roberts, Yoshitaka Itow, D. Lopiano, and H. En'yo
Subjects: Physics, Nuclear and High Energy Physics, Meson, media_common.quotation_subject, Hadron, Elementary particle, CONSTITUENTS, SCATTERING, GEV/C, Asymmetry, Nuclear physics, Pion, Antiproton, High Energy Physics::Experiment, Nuclear Experiment, Boson, Spin-½, media_common
Abstract: A measurement of the single-spin asymmetry A(N) in P up + P --> pi-0 + X at 200 GeV with x(F) = O shows a transition in the production process from a "low-x(T)" regime with A(N) = 0, through an intermediate region of negative asymmetry, to a "high-x(T)" regime with A(N) > 0.3. This transition occurs at x(T) almost-equal-to 0.4 and is consistent with x(T)-scaling of A(N) in pion production using polarized beams or targets from square-root -s = 5.2 to 19.4 GeV. Results for A(N) in eta-production by polarized protons and in pi-0 production by polarized antiprotons are also presented.
Published: 1992

30. Analyzing power in inclusive π+ and π− production at high x with a 200 GeV polarized proton beam

Author: S. Makino, VL Rykov, J. Langland, N. Tamura, Yasar Onel, V. L. Solovyanov, N. Tanaka, T. Yoshida, J. Cranshaw, G. Salvato, H. Funahashi, A. Michalowicz, Kazuo Iwatani, Jay Roberts, K.W. Krueger, G.C. Phillips, N. I. Belikov, J. Skeens, K. Imai, P. Schiavon, J. L. White, D. L. Adams, A. Yokosawa, F. Luehring, J.M. Clement, A. P. Meschanin, Aldo Penzo, Ryuichi Takashima, Anna Zanetti, A. N. Vasiliev, A. de Lesquen, C. Nguyen, J. Bystricky, L. van Rossum, M. Nessi, S. B. Nurushev, Antonio Villari, Yoshitaka Itow, S. Yamashita, G. Pauletta, D. Lopiano, H. En'yo, F. Nessi-Tedaldi, Akira Masaike, J. D. Cossairt, Kozo Miyake, D. G. Underwood, Y. Goto, A.L. Read, F. Lehar, K. Kuroda, Yu.A. Matulenko, David Miller, Norio Saito, T. Nagamine, Robert Stanek, D. I. Patalakha, N. Akchurin, H. M. Spinka, M. D. Corcoran, O. A. Grachov, Y. Ohashi, T. Maki, A. A. Derevschikov, Fujio Takeutchi, D. Grosnick, D. Hill, B. E. Bonner, and J.A. Buchanan
Subjects: Quark, Physics, Nuclear and High Energy Physics, Meson, 18.5 GEV/C, Hadron, Hyperon, SPIN ASYMMETRY, Elementary particle, HADRON-PRODUCTION, SUM-RULE, Nuclear physics, Pion, BERYLLIUM, SCATTERING, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, HYPERON POLARIZATION, Boson
Abstract: The analyzing power in inclusive charged pion production has been measured using the 200 GeV Fermilab polarized proton beam. A striking dependence in x(F) is observed in which A(N) increases from 0 to 0.42 with increasing x(F) for the pi+ data and decreases from 0 to -0.38 with increasing x(F) for pi- data. The kinematic range covered is 0.2 less-than-or-equal-to x(F) less-than-or-equal-to 0.9 and 0.2 less-than-or-equal-to p(T) 2.0 GeV/c. In a simple model our data indicate that at large x(F) the transverse spin of the proton is correlated with that of its quark constituents.
Published: 1991

31. Comparison of spin asymmetries and cross sections in π0 production by 200 GeV polarized antiprotons and protons

Author: N. Tamura, A. Yokosawa, K. Imai, P. Schiavon, Fujio Takeutchi, Kazuo Iwatani, F. Luehring, S. Yamashita, F. Nessi-Tedaldi, A. N. Vasiliev, D. Grosnick, Kozo Miyake, S. B. Nurushev, Y. Goto, N. Tanaka, D. Lopiano, H. En'yo, Antonio Villari, H. Funahashi, T. Maki, D. Hill, G. Pauletta, N. Akchurin, Aldo Penzo, T. Nagamine, G. Salvato, D. L. Adams, C. Nguyen, Akira Masaike, A. Michalowicz, Jay Roberts, J. L. White, N. I. Belikov, S. Makino, Ryuichi Takashima, Anna Zanetti, K.W. Krueger, Yoshitaka Itow, D. G. Underwood, D. I. Patalakha, M. Laghai, L. van Rossum, J. Bystricky, Yu.A. Matulenko, David Miller, K. Kuroda, A. A. Derevschikov, A.L. Read, J. D. Cossairt, M. Nessi, F. Lehar, Yasar Onel, H. M. Spinka, J. Skeens, A. P. Meschanin, A. de Lesquen, VL Rykov, J. Cranshaw, M. D. Corcoran, O. A. Grachov, V. L. Solovyanov, Norio Saito, Y. Ohashi, and T. Yoshida
Subjects: Physics, Nuclear and High Energy Physics, Meson, Hadron, Elementary particle, Effective mass (spring–mass system), Nuclear physics, Particle decay, Pion, Antiproton, Physics::Accelerator Physics, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment
Abstract: The single-spin asymmetry A{sub N}(anti pp) for inclusive {pi}{sup 0} production at 0.5 < p{sub t} < 2GeV/c by 200 GeV transversely-polarized antiprotons on protons has been measured at Fermilab over a wide range of x{sub F}. We observe that A{sub N}(anti pp) has the same sign, a similar x{sub F} dependence, and about half the magnitude as A{sub N}(pp) for {pi}{sup 0} production by protons. We also present the ratio of the spin-averaged sections for {pi}{sup 0} production by antiproton and by protons. (orig.).
Published: 1991

32. Nuclear Structure Relevant to Neutrinoless DoubleβDecay:Ge76andSe76

Author: Andreas Martin Heinz, Jason A. Clark, Conor Fitzpatrick, S. Gros, S. J. Freeman, C. L. Jiang, P. D. Parker, V. Werner, K. E. Rehm, B. P. Kay, Catherine Deibel, Christopher Wrede, J. P. Schiffer, D. Hirata, A. Parikh, and Antonio Villari
Subjects: Nuclear physics, Physics, Valence (chemistry), Double beta decay, Nuclear structure, General Physics and Astronomy, Neutron, Fermi surface, Neutrino, Atomic physics, Nuclear Experiment, Nucleon, Beta decay
Abstract: The possibility of observing neutrinoless double {beta} decay offers the opportunity of determining the effective neutrino mass if the nuclear matrix element were known. Theoretical calculations are uncertain, and measurements of the occupations of valence orbits by nucleons active in the decay can be important. The occupation of valence neutron orbits in the ground states of {sup 76}Ge (a candidate for such decay) and {sup 76}Se (the daughter nucleus) were determined by precisely measuring cross sections for both neutron-adding and removing transfer reactions. Our results indicate that the Fermi surface is much more diffuse than in theoretical calculations. We find that the populations of at least three orbits change significantly between these two ground states while in the calculations, the changes are confined primarily to one orbit.
Published: 2008

33. Studies of uranium carbide targets of a high density

Author: M. Dubois, P. L. Molkanov, L. Stroe, S. Essabaa, M. G. Saint Laurent, G. Gaubert, A. M. Ionan, C. Mhamed, O. Alyakrinskiy, K. A. Mezilev, L.B. Tecchio, M. Tonezzer, Yu. M. Volkov, C. Eleon, D. V. Fedorov, P. Jardin, M. Barbui, A. E. Barzakh, F. V. Moroz, V. S. Ivanov, G. Lhersonneau, R. Leroy, V. N. Panteleev, S.Yu. Orlov, C. Lau, Antonio Villari, Laboratori Nazionali di Legnaro (LNL), Istituto Nazionale di Fisica Nucleare (INFN), 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), 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), M. Lion, W. Mittig, O. Navilliat-Cuncic, P. Roussel-Chomaz, A.C.C. Villari, 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: Yield, Nuclear and High Energy Physics, Pellets, Small target, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Massive target, 01 natural sciences, Preliminary analysis, Ionising target, chemistry.chemical_compound, Delay time, Uranium carbide target, Instrumentation, 0103 physical sciences, Nuclide, 010306 general physics, Isotope, 010308 nuclear & particles physics, Radiochemistry, Ambientale, 25.40.Sc, 28.60.+S, 29.25.Ni, 29.25.Rrn, chemistry, Yield (chemistry), TASK 4 [4], Uranium carbide
Abstract: International audience; Production of Rb, Cs and Fr isotopes from uranium carbide targets of a high density has been investigated. The UC target material with a density of 12 g/cm3 was prepared in a form of pellets of 2 mm thickness, 11 mm in diameter and grain dimensions of about 20 microns. Two targets were tested on-line at the same temperature conditions: a) a reference small target with a thickness of 4.5 g/cm2; b) a big massive target with a thickness of 91 g/cm2. The yields and release efficiencies of the nuclides with the half-lives from some minutes to some milliseconds produced from the investigated targets have been presented. A preliminary analysis of the obtained results has shown an increase of the produced nuclide yields proportionally to the target thickness even for very short-lived isotopes 214Fr (T1/2=5 ms) and 219Fr (T1/2=20 ms). One month off-line heating test of a big target at a temperature of 2000 °C has been conducted. The yields and release of Rb, Cs and Fr measured on-line before and after the heating test coincided in the limits of measurement errors that demonstrated the conservation of the developed target unit parameters. The construction of a big target with the mass about 0.7 kg prepared presently at IRIS has been discussed.
Published: 2008

34. Nuclear Charge Radius ofHe8

Author: Peter Mueller, R. V. F. Janssens, N. Lecesne, R. Alves-Conde, M. G. Saint-Laurent, R. J. Holt, Gordon W. F. Drake, Marc Dubois, Antonio Villari, I. A. Sulai, Li-Bang Wang, Kevin Bailey, Juan Antonio Alcantara-Nunez, G. Gaubert, C. Eleon, Zheng-Tian Lu, Thomas P. O'Connor, and J. C. Thomas
Subjects: Physics, 010308 nuclear & particles physics, General Physics and Astronomy, Charge density, Charge (physics), Radius, 01 natural sciences, 7. Clean energy, Effective nuclear charge, Atomic theory, Charge radius, 0103 physical sciences, Neutron, Physics::Atomic Physics, Atomic number, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: The root-mean-square (rms) nuclear charge radius of $^{8}\mathrm{He}$, the most neutron-rich of all particle-stable nuclei, has been determined for the first time to be 1.93(3) fm. In addition, the rms charge radius of $^{6}\mathrm{He}$ was measured to be 2.068(11) fm, in excellent agreement with a previous result. The significant reduction in charge radius from $^{6}\mathrm{He}$ to $^{8}\mathrm{He}$ is an indication of the change in the correlations of the excess neutrons and is consistent with the $^{8}\mathrm{He}$ neutron halo structure. The experiment was based on laser spectroscopy of individual helium atoms cooled and confined in a magneto-optical trap. Charge radii were extracted from the measured isotope shifts with the help of precision atomic theory calculations.
Published: 2007

35. Electron beam - plasma ionizing target for production of neutron-rich nuclides

Author: D. V. Fedorov, Yu. M. Volkov, S. Essabaa, F. V. Moroz, L.B. Tecchio, A. M. Ionan, A. E. Barzakh, V. S. Ivanov, R. Leroy, G. Lhersonneau, Antonio Villari, K. A. Mezilev, P. L. Molkanov, L. Stroe, V. N. Panteleev, S.Yu. Orlov, C. Lau, 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), 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), Laboratori Nazionali di Legnaro (LNL), Istituto Nazionale di Fisica Nucleare (INFN), M. Lion, W. Mittig, O. Navilliat-Cuncic, P. Roussel-Chomaz, A.C.C. Villari, 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 and High Energy Physics, Yield, Materials science, Proton, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], chemistry.chemical_element, 7. Clean energy, 01 natural sciences, Ionising target, chemistry.chemical_compound, Ionization, 0103 physical sciences, Neutron, Nuclide, 010306 general physics, Instrumentation, 010302 applied physics, Isotope, Radiochemistry, Plasma, Uranium carbide target, Uranium, 25.40.Sc, 28.60.+S, 29.25.Ni, 29.25.Rrn, chemistry, TASK 4 [4], Uranium carbide, Ionization efficiency
Abstract: The production of neutron-rich Ag, In and Sn isotopes from a uranium carbide target of a high density has been investigated at the IRIS facility in the PLOG (PNPI-Legnaro-GANIL-Orsay) collaboration. The UC target material with a density of 12 g/cm3 was prepared by the method of powder metallurgy in a form of pellets of 2 mm thickness, 11 mm in diameter and grain dimensions of about 20 μm. The uranium target mass of 31 g was exposed at a 1 GeV proton beam of intensity 0.05–0.07 μA. For the ionization of the produced species the electron beam–plasma ionization inside the target container (ionizing target) has been used. It was the first experiment when the new high density UC target material was exploited with the electron–plasma ionization. Yields of Sn isotopes have been measured in the target temperature range of (1900–2100) °C. The yields of some Pd, In and Cd isotopes were measured as well to compare to previously measured ones from a high density uranium carbide target having a ceramic-like structure. For the first time a nickel isotope was obtained from a high density UC target.
Published: 2007

36. Pair correlations in nuclei involved in neutrinoless double β decay:Ge76andSe76

Author: Christopher Wrede, S. J. Freeman, D. Hirata, C. L. Jiang, J. P. Schiffer, Jason A. Clark, V. Werner, Catherine Deibel, Antonio Villari, S. Gros, K. E. Rehm, A. Parikh, J. Qian, P. D. Parker, Andreas Martin Heinz, B. P. Kay, and X. D. Tang
Subjects: Physics, Nuclear and High Energy Physics, Forward angle, 010308 nuclear & particles physics, Pairing, Double beta decay, 0103 physical sciences, Neutron, State (functional analysis), Atomic physics, 010306 general physics, Ground state, 01 natural sciences
Abstract: Precision measurements were carried out to test the similarities between the ground states of $^{76}\mathrm{Ge}$ and $^{76}\mathrm{Se}$. The extent to which these two nuclei can be characterized as consisting of correlated pairs of neutrons in a BCS-like ground state was studied. The pair removal $(p,t)$ reaction was measured at the far forward angle of ${3}^{\ifmmode^\circ\else\textdegree\fi{}}$. The relative cross sections are consistent (at the 5% level) with the description of these nuclei in terms of a correlated pairing state outside the $N=28$ closed shells with no pairing vibrations. Data were also obtained for $^{74}\mathrm{Ge}$ and $^{78}\mathrm{Se}$.
Published: 2007

37. Mass measurements of neutron-rich nuclei near the N=20 and 28 shell closures

Author: Alinka Lepine-Szily, Y. E. Penionzhkevich, B. Jurado, A. Khouaja, S. M. Lukyanov, J. Mrazek, W. N. Catford, D. Baiborodin, S. Pita, A. Gillibert, M. Rousseau, Lydie Giot, W. Mittig, N. A. Orr, C. E. Demonchy, Antonio Villari, Z. Dlouhý, H. Savajols, Marielle Chartier, P. Roussel-Chomaz, 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), 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), 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), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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 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), 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, Isotope, Deformation (mechanics), 010308 nuclear & particles physics, Binding energy, Nuclear Theory, Shell (structure), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Closure (computer programming), Neutron number, 0103 physical sciences, Neutron, 010306 general physics, Nuclear Experiment, Sudden onset
Abstract: GANIL E364; Mass measurements of very neutron-rich nuclei near the N=20 and 28 shell closures are presented. Seven masses have been determined for the first time and the precision of 36 masses has been significantly improved. These results are used to investigate the evolution of the odd–even staggering of binding energies with neutron number. Special attention is paid to the evolution of the N=28 shell closure as the neutron dripline is approached. Changes in shell structure are observed around N=28 for the P and S isotopes but not for Si. This may be interpreted as a persistence of the shell closure at N=28 or as the result of a very sudden onset in deformation at $^{42}$Si.
Published: 2007

38. Recent developments and on-line tests of uranium carbide targets for production of nuclides far from stability

Author: O. Bajeat, K. A. Mezilev, M. G. Saint Laurent, P. L. Molkanov, L. Stroe, Alberto Andrighetto, L.B. Tecchio, S.Yu. Orlov, S. Essabaa, A. Lanchais, C. Eleon, Antonio Villari, G. Gaubert, C. Mhamed, A. M. Ionan, R. Leroy, G. Lhersonneau, Marc Dubois, P. Jardin, Yu. M. Volkov, F. V. Moroz, C. Lau, V. S. Ivanov, V. N. Panteleev, O. Alyakrinskiy, V. Rizzi, A. E. Barzakh, Dmitry Fedorov, Laboratori Nazionali di Legnaro (LNL), Istituto Nazionale di Fisica Nucleare (INFN), 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), 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: Materials science, Proton, Isotope separation and enrichment, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, chemistry.chemical_compound, 0103 physical sciences, Low density, General Materials Science, Nuclide, Physical and Theoretical Chemistry, source of radioactive nuclei, 010306 general physics, 25.85.-w, 28.60.+S, 29.25.-t, 29.25.Rm, Line (formation), particle source and targets, 010308 nuclear & particles physics, chemistry, Synchrocyclotron, Fission reactions, TASK 4 [4], Uranium carbide, Beam (structure)
Abstract: International audience; The capacity of uranium carbide target materials of different structure and density for production of neutron-rich and heavy neutron-deficient nuclides have been investigated. The yields of Cs and Fr produced by a 1 GeV proton beam of the PNPI synchrocyclotron and release properties of different targets have been measured. Yields and release efficiencies of Cs and Fr produced from a high density UC target material and from low density UCx prepared by the ISOLDE method at IRIS in the collaboration with PARRNe group from Orsay are compared. The yields from ISOLDE original target are presented for comparison as well.
Published: 2007

39. $S^3$: the Super Separator Spectrometer for LINAG

Author: Antonio Villari, Jerry Nolen, A. Drouart, 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), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), ANL, Yu. E. Penionzhkevich, E. A. Cherepanov, SPIRAL2, and Lion, Michel
Subjects: Super-heavy, spectroscopy, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], super separator spectrometer, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Cyclotron resonance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Electron cyclotron resonance, Linear particle accelerator, law.invention, Ion, Nuclear physics, superheavy nuclei, separator spectrometer, LINAG, law, fission, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment, SPIRAL2, linear accelerators, Spectrometer, Chemistry, deep inelastic heavy ion reactions, particle separators, Particle accelerator, Ion source, 29.30.-h, 25.70.-z, Atomic physics, Nucleon, transfer
Abstract: International audience; $S^3$ (Super Separator Spectrometer) is a device proposed for experiments with the very high intensity stable beams of LINAG, the superconducting linear accelerator of GANIL, which will be built in the framework of SPIRAL2. These beams, which will provide in a first phase of SPIRAL2 ions with A/q = 3, can reach intensities exceeding 100pµA for lighter ions (A < 40 – 50) depending on the final choice of the ECR (Electron Cyclotron Resonance) ion source. These unprecedented intensities open new opportunities in several physics domains, e.g. super-heavy and very-heavy nuclei, spectroscopy at and beyond the dripline, muld-nucleon transfer and deep-inelastic reactions, isomers and ground state properties and nuclear molecular resonances. An international collaboration interested in the aforementioned physics has been formed for developing technical solutions for this new instrument.
Published: 2006

40. Visible light spectrometry measurements for studying an ECRIS plasma and especially applied to the MONO1001 ion source

Author: G. Gaubert, F. Lemagnen, N. Lecesne, M. Dubois, J. Y. Pacquet, Olivier Tuske, R. Leroy, L. Maunoury, M.G. Saint-Laurent, P. Lehérissier, Antonio Villari, P. Jardin, C. Barué, Lion, Michel, Grand Accélérateur National d'Ions Lourds (GANIL), 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: Materials science, Cyclotron resonance, Resonance, Magnetic confinement fusion, XX, Electron cyclotron resonance, Ion source, Fourier transform ion cyclotron resonance, Physics::Plasma Physics, [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Physics::Accelerator Physics, Plasma diagnostics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Atomic physics, Instrumentation, Ion cyclotron resonance
Abstract: The cylindrical geometry of the magnetic confinement of the MONO1001 electron cyclotron resonance (ECR) ion source made in GANIL [P. Jardin et al., Rev. Sci. Instrum. 73, 789 (2002)] allows us to measure radial characteristics of the working ECR plasma with helium gas. The physical and the geometrical characteristics of the resonance surface inside the working ECR source have been quantified with the help of a visible light spectrometer. Hence, we have deduced a shape of the electron cyclotron resonance ion sources resonance surface which corresponds closely to our magnetic calculations.
Published: 2004

41. Fast unstable nuclear beam facilities: present and future

Author: Antonio Villari, J.R.J. Bennett, 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, Nuclear physics, Acceleration, Ion accelerators, 010308 nuclear & particles physics, Nuclear engineering, 0103 physical sciences, General Engineering, Energy Engineering and Power Technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, Beam (structure)
Abstract: A review is given of the present and future facilities for the production and acceleration of unstable nuclear beams for exciting physics research at the limits of nuclear stability. The various methods for the production of unstable beams using in-flight and ISOL techniques with thick and thin targets are discussed, including their advantages and disadvantages. Some typical examples of facilities are shown. New concepts, future research developments and proposals for ambitious large facilities to meet the challenges of the future are described. To cite this article: A.C.C. Villari, J.R.J. Bennett, C. R. Physique 4 (2003).
Published: 2003

42. Efficiency and production yield measurements of radioactive O, N, and F for the SPIRAL facility

Author: Jean-Yves Pacquet, A. Khouaja, O. Bajeat, F. Landré-Pellemoine, H. Lefort, J. M. Casandjian, Y. Huguet, R. Leroy, S. Kandri, S. Essabaa, M. G. Saint-Laurent, L. Maunoury, C. Stodel, J. C. Angélique, D. Nayak, P. Jardin, Antonio Villari, C. Marry, C. Lau, A. Joinet, G. Gaubert, N. Lecesne, F. Bocage, S. Gibouin, 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), 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 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), SPIRAL, 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)-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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Nuclear and High Energy Physics, Test bench, 010308 nuclear & particles physics, Chemistry, Radiochemistry, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nitrogen, Oxygen, Ion source, Isotopes of oxygen, Isotopes of nitrogen, Yield (chemistry), 0103 physical sciences, 010306 general physics, Instrumentation, Spiral
Abstract: International audience; Production efficiencies of radioactive oxygen and nitrogen beams for the SPIRAL targetsourcesystem, measured at GANIL on the SIRa test bench, are presented. From the overallefficiency of oxygen, the product between the efficiency of transformation of O into CO and theeffusion of CO from the target to the ion source, was deduced. The production yieldmeasurements of oxygen and nitrogen isotopes performed on the SIRa test bench and those offluorine directly measured on the SPIRAL facility are presented.
Published: 2002

43. Constrainst due to the production of radioactive ion beams in the SPIRAL project

Author: Jean-Yves Pacquet, Antonio Villari, Y. Huguet, C. Marry, P. Jardin, R. Leroy, 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), and SPIRAL
Subjects: Materials science, Ion beam, radioactive sources, Cyclotron, ion beams, 29.25.Rm, 29.25.Ni, Radiation, Ion gun, Accelerators and Storage Rings, Electron cyclotron resonance, Ion source, law.invention, Ion beam deposition, ion sources, Physics::Plasma Physics, law, Physics::Accelerator Physics, Irradiation, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Atomic physics, Instrumentation
Abstract: The radioactive ion beams that will be delivered by the SPIRAL facility will be produced by the interaction of a stable high energy (95 MeV/A) and high intensity (2×1013 particle/s) primary ion beam delivered by the GANIL cyclotrons with a carbon target heated to 2000 °C. During this interaction, some radioactive atoms will be created and will diffuse out of the target before entering into an electron cyclotron resonance (ECR) ion source where they will be ionized and extracted. The production of radioactive ion beams with this method implies high radiation fields that activate and can damage materials located in the neighborhood of the target. Therefore, the production system which is composed of the permanent magnet ECR ion source coupled to a graphite target will be changed after two weeks of irradiation. As this ensemble will be very radioactive, this operation has to be supervised by remote control. The radiation levels around the target–ion source system and a detailed description of the different p...
Published: 1997

44. Cluster structures observed in40Ca from12C+28Si scattering

Author: G. F. Lima, K. C. C. Pires, Alinka Lepine-Szily, Rubens Lichtenthäler, D. R. Mendes, E. A. Benjamim, O. Camargo, W Sciani, Adriana Barioni, J. A. Alcantara, Valdir Guimaraes, P. N. de Faria, Antonio Villari, R Y R Kuramoto, R. Z. Denke, Juliano Morales Oliveira, and L. C. Chamon
Subjects: Physics, Elastic scattering, Nuclear reaction, History, Scattering, Excited state, Nuclear structure, Coulomb barrier, Atomic physics, Excitation, Computer Science Applications, Education, S-matrix
Abstract: We discuss evidences of strong cluster structures observed in nuclear reactions even at quite high excitation energies. The oscillatory angular distributions of the elastic scattering of the 12C+28Si system measured at 13 energies close to the Coulomb barrier were reproduced introducing in the scattering S-matrix additional Regge-pole form terms. These poles were interpreted as describing doorway states with 12C+28Si cluster structure in the composite nucleus 40Ca. The excitation energies of these states indicate that they can be part of a rotational band in 40Ca, together with similar states observed in the elastic scattering and α-transfer reactions of the 16O+24Mg system. We propose that the presently observed, largely deformed molecular band corresponds to the hyper-deformed band in 40Ca, which has been found in a new Nilsson-model-calculation, which predicts preference of the 12C + 28Si and 16O + 24Mg molecular structures, in accordance with our present results.
Published: 2013

45. A new method for measuring the absolute efficiency of isotope separation on-line systems

Author: J. Mandin, J.C. Putaux, J. Proust, Jean-Yves Pacquet, B. Blank, M. G. Saint-Laurent, M. Lewitowicz, P. Bertrand, F. Clapier, N. Lecesne, F De Las Heras, A. Joubert, Pascal Sortais, N.A. Orr, Antonio Villari, P. Paris, R. Leroy, J. C. Angélique, P. Foury, J.C. Potier, L. Maunoury, E. Robert, P. Jardin, M. Ducourtieux, C. Marry, J. Obert, Alinka Lepine-Szily, C.F. Liang, 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), 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), 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 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 de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), 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 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), and Lorgeril, Jocelyne
Subjects: Absolute efficiency, Arrhenius equation, Nuclear and High Energy Physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Analytical chemistry, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Isotope separation, law.invention, symbols.namesake, chemistry, law, Ionization, 0103 physical sciences, symbols, Detectors and Experimental Techniques, Diffusion (business), 010306 general physics, Instrumentation, Carbon, Radioactive beam, Line (formation)
Abstract: A new method for measuring the absolute efficiency of Isotope Separation On-Line (ISOL) systems is described. The overall efficiency is deduced from the ratio between the rate of the radioactive beam detected after analysis and the rate of incident radioactive beam in the target. It is shown that the unfolding of the different efficiencies, i.e., diffusion, effusion, ionisation and transport allows us to deduce the diffusion constants when the absolute efficiency data is obtained as a function of the target temperature. Using this technique we extracted the fundamental Arrhenius constants for diffusion of Ar and Ne in Carbon targets used in the SIRa experiments at GANIL.
Published: 1996

46. News from the SPIRAL project at GANIL

Author: Antonio Villari, 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), and SPIRAL
Subjects: Physics, Radioactive ion beams, Nuclear and High Energy Physics, Ion beam, Cyclotron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Accelerators and Storage Rings, Electron cyclotron resonance, Ion source, law.invention, Ion, Nuclear physics, Physics::Plasma Physics, law, Magnet, Physics::Accelerator Physics, Nuclear Experiment, Beam (structure)
Abstract: The present status of the radioactive ion beam facility SPIRAL, currently under construction, is given. SPIRAL is based on the very high intensity beams which will become available in the near future at GANIL (2H to 40Ar at 6kW and 96A MeV). The facility will produce radioactive ion beams using the ISOL (Isotopic Separator On-Line) method and a permanent magnet ECRIS (Electron Cyclotron Resonance Ion Source) which will allow for the production of multiply charged radioactive ions. The beam will be accelerated by a K = 265 compact cyclotron and delivered to the existing experimental areas of GANIL.
Published: 1996

47. Measurement of single spin asymmetry for direct photon production in pp collisions at 200 GeV/c

Author: Jay Roberts, D. G. Underwood, P. Schiavon, S. Makino, A. P. Meschanin, M. Nessi, H. Funahashi, K. Imai, S. B. Nurushev, D. Lopiano, K. Kuroda, D. I. Patalakha, Fujio Takeutchi, S. Yamashita, D. Grosnick, H. En'yo, J. Cranshaw, G. Salvato, F. Nessi-Tedaldi, J. L. White, Yu A. Matulenko, F. Luehring, M. D. Corcoran, Ryuichi Takashima, D. Hill, O. A. Grachov, N. Tamura, A. Michalowicz, N. I. Belikov, Norio Saito, N. Tanaka, Y. Ohashi, A. Bravar, T. Mäki, J. D. Cossairt, Aldo Penzo, C. Nguyen, Yasar Onel, Kozo Miyake, Y. Goto, VL Rykov, Akira Masaike, J. Bystricky, J. Skeens, Andrey Vasiliev, David H. Adams, N. Achurin, T. Iijima, T. Nagamine, Anna Zanetti, F. Lehar, A. Yokosawa, Kazuo Iwatani, K. Krueger, Antonio Villari, Yoshitaka Itow, A. de Lesquen, L. Van Rossum, Tatsushi Shima, H. M. Spinka, T. Yoshida, V. L. Solovyanov, A. A. Derevschikov, G. Pauletta, David Miller, and A. L. Read
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, Proton, Scattering, Physics::Instrumentation and Detectors, media_common.quotation_subject, Asymmetry, Nuclear physics, Lead glass, Experimental uncertainty analysis, Antiproton, visual_art, visual_art.visual_art_medium, High Energy Physics::Experiment, Fermilab, POLARIZED-PROTON-BEAM, ANALYZING POWER, PI-0 PRODUCTION, ANTIPROTONS, SCATTERING, PI(0), Beam (structure), media_common, Spin-½
Abstract: The single spin asymmetry for inclusive direct-photon production has been measured using a polarized proton beam of 200 GeV/c with an unpolarized proton target at -0.15 < x(F) < 0.15 and 2.5 < p(T) < 3.1 GeV/(c) at Fermilab. The data on the cross section for pp --> gamma X at 2.5 < p(T) < 3.8 GeV/c are also provided. The measurement was done using lead-glass calorimeters and photon detectors which surrounded the fiducial area of the calorimeters. Background rejection has been done using these surrounding photon detectors. The cross section obtained is consistent with the results of previous measurements assuming a nuclear dependence of A(1.0). The single spin asymmetry, A(N), for the direct-photon production is consistent with zero within experimental uncertainty.
Published: 1995

48. A cyclotron as a high resolution mass spectrometer for fast secondary ions

Author: M. Chabert, A. Gillibert, M. Bajard, Alinka Lepine-Szily, L. Gaudard, G. Auger, C. Ricault, Yang Yong Feng, J. Fermé, M. H. Moscatello, D. Bibet, Antonio Villari, N. A. Orr, E. Plagnol, L.K. Fifield, E. Baron, P. Bricault, W. Mittig, M. Lewitowicz, Marielle Chartier, J. M. Casandjian, 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), 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), 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 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, Resolution (mass spectrometry), Cyclotron, Scintillator, Mass spectrometry, Fourier transform ion cyclotron resonance, law.invention, Nuclear physics, Physics::Plasma Physics, law, Physics::Space Physics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment, Nucleon, Instrumentation, Ion cyclotron resonance, ComputingMilieux_MISCELLANEOUS, Hybrid mass spectrometer
Abstract: We present the first results from a new method for mass measurements developed using the GANIL coupled cyclotrons, which uses a cyclotron as a high resolution mass spectrometer for fast secondary ions. We report here the results obtained with primary beams of 13.74 MeV/nucleon 15N and 12C, accelerated by the first cyclotron and incident on a Ta target located between the cyclotrons. Reaction products with mass-to-charge ratio of 3 were selected and accelerated by the second cyclotron. The accelerated secondary nuclei were detected in the interior of the second cyclotron using a plastic scintillator located on a radially moving rod. Details of the procedure and results are discussed. When two masses are close enough to be accelerated simultaneously by the second cyclotron, the precision in the measurement of the mass difference is better than 10−6.
Published: 1994

49. Investigation of the local hardening effect produced by various low-Z materials in a Si/(Fe, Pb) electromagnetic calorimeter

Author: Paolo Giubellino, E. Borchi, C. Furetta, L. Ramello, R. Paludetto, R. Macci, A.L.S. Angelis, F. Lamarche, C. Manoukian-Bertrand, G. Salvato, S. Pensotti, A. Penzo, Claude Leroy, Antonio Villari, P. G. Rancoita, A. Seidman, L. Riccati, and L. Vismara
Subjects: Physics, Nuclear and High Energy Physics, Silicon, Physics::Instrumentation and Detectors, COMPENSATION CONDITION, HADRONIC CALORIMETRY, SHOWERS, Hadron, Resolution (electron density), Equalization (audio), chemistry.chemical_element, Signal, Calorimeter, Nuclear physics, chemistry, High Energy Physics::Experiment, Detectors and Experimental Techniques, Instrumentation, Radiation hardening, Energy (signal processing)
Abstract: The condition for obtaining a calorimetric response linear with energy for hadronic showers and an energy resolution that improves as the incident energy increases is the equalization of the electromagnetic (e) and the hadronic (pi) signal responses. This equalization is obtained by exploiting a local hardening effect realized through the insertion of low-Z thin plates between the high-Z absorbers and the active material in a hadronic calorimeter with silicon readout. This effect, which allows the reduction of the calorimeter response to the electromagnetic component of the incoming hadronic showers, has been investigated for different low-Z materials. The relevance of some aspects of this study to the radiation hardness of the calorimeters is also addressed.
Published: 1992

50. Documento de consenso sobre las dietas de exclusión en el síndrome del intestino irritable (SII)

Author: Francesc Casellas, Rosa Burgos, Ascensión Marcos, Javier Santos, Constanza Ciriza-de-los-Ríos, Álvaro García-Manzanares, Isabel Polanco, María Puy-Portillo, Antonio Villarino, Beatriz Lema-Marqués, and M.ª-del-Carmen Vázquez-Alférez
Subjects: Documento de consenso. Síndrome del intestino irritable, FODMAP, Gluten, Lactosa, Educación para la salud, Dietas exclusión, Diseases of the digestive system. Gastroenterology, RC799-869
Abstract: RESUMEN Este documento resume el contenido del documento de consenso sobre las dietas de exclusión en el síndrome del intestino irritable elaborado por el grupo de trabajo de la SEPD, FEAD, SENPE, FESNAD, SEÑ, SEEN, SEGHNP, SEDCA y ADENYD. El documento completo está disponible en la web de la SEPD. El síndrome del intestino irritable es un trastorno funcional digestivo muy prevalente en el que, aparte del farmacológico, el tratamiento dietético y la adquisición de hábitos saludables son básicos para su control. Para facilitar el consejo dietético a estos pacientes en la práctica diaria se ha elaborado el presente documento de consenso sobre el papel de las dietas de evitación en el síndrome del intestino irritable. Para ello se ha recogido la opinión consensuada de diferentes expertos que representan a las principales sociedades científicas nacionales para establecer unas recomendaciones aplicables en la práctica asistencial en los pacientes con síndrome del intestino irritable.
Published: 2018
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