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Nerlo-Pomorsk B.,Maria Curie Sklodowska University | Pomorsk K.,Maria Curie Sklodowska University | Bartel J.,CNRS Hubert Curien Multi-disciplinary Institute | Schmitt C.,GANIL
Acta Physica Polonica B | Year: 2017

The recently developed extremely flexible and rapidly converging Fourier shape parametrisation is used to evaluate the potential energy surfaces of 210Th-238Th even-even isotopes within the macroscopic-microscopic method. A vast sample of 4D landscapes is analysed, searching for absolute and local extrema, ridges and valleys. The expected fission-fragment mass distribution obtained from different Th isotopes at low excitation energy is illustrated by a static analysis of the potential energy landscape. Quadrupole moments in the relevant minima are also evaluated.

Nerlo-Pomorska B.,Maria Curie Sklodowska University | Pomorski K.,Maria Curie Sklodowska University | Bartel J.,CNRS Hubert Curien Multi-disciplinary Institute | Schmitt C.,GANIL
Acta Physica Polonica B, Proceedings Supplement | Year: 2017

The potential energy landscapes of Hg-U nuclei were calculated within the macroscopic-microscopic method with a Fourier nuclear shape parametrisation and the Lublin-Strasbourg Drop for the macroscopic energy. Microscopic corrections based on the Yukawa folded single-particle potential were obtained with the Strutinsky shell-correction method and the BCS approximation. The energy landscapes of even-even isotopes of Hg, Po, Ra and U were analysed in a 4-dimensional deformation space and projected onto the quadrupole-octupole plane. Extrema, ridges and valleys were localized and the electric quadrupole moments in these minima were evaluated. A comparison with the experimental data for the ground state is shown for the Hg isotopes.

Johnson T.D.,Brookhaven National Laboratory | Symochko D.,Ukrainian Academy of Sciences | Fadil M.,GANIL | Tuli J.K.,Brookhaven National Laboratory
Nuclear Data Sheets | Year: 2011

The 2000 Nuclear Data Sheets for A=142 by J. K. Tuli, with literature cutoff date of February 4, 2000, has been revised. The evaluated experimental data are presented for 16 known nuclides of mass 142 (Ba, Ce, Cs, Dy, Eu, Gd, Ho, I, La, Nd, Pm, Pr, Sm, Tb, Te, Xe). Comparing to the previous evaluation (2000Tu01) significant changes were done to the level schemes of Gd, Cs, Ce and Nd. For all nuclides, the more recent Q values have been added. © 2011 Elsevier Inc.

Sargsyan V.V.,Yerevan State University | Scamps G.,GANIL | Adamian G.G.,Joint Institute for Nuclear Research | Antonenko N.V.,Joint Institute for Nuclear Research | Lacroix D.,University Paris - Sud
Physical Review C - Nuclear Physics | Year: 2013

Sub-barrier capture reactions following neutron-pair transfer are proposed to be used for the indirect study of the neutron-neutron correlation in the surface region of a nucleus. The strong effect of dineutron-like cluster transfer stemming from the surface of magic and nonmagic nuclei 18O, 48Ca, 64Ni, 94,96Mo, 100,102,104Ru, 104 ,106,108Pd, and 112,114,116 ,118,120,124,132Sn is demonstrated. The dominance of the two-neutron transfer channel in the vicinity of the Coulomb barrier is further supported by time-dependent mean-field approaches. © 2013 American Physical Society.

Tanihata I.,Osaka University | Tanihata I.,Beihang University | Savajols H.,GANIL | Kanungo R.,Saint Mary's University, Halifax
Progress in Particle and Nuclear Physics | Year: 2013

Recent developments (since the last review in J. of Physics G by I. Tanihata in 1996 [1]) at RIB facilities opened possibilities of detailed studies of halo nuclei. New facilities have been constructed to provide higher intensity beams of radioactive nuclei in a wide range of energies. At the time of the last review, only secondary beams by projectile fragmentation were the production source of halo nuclei for use in reaction studies. Since then, re-acceleration facilities have been developed and thus high-quality low-energy beams become available for the reaction studies. The wide variety of new data are thus available on halo nuclei and nuclei on and outside of proton and neutron drip lines. Low energy beams provided a means to determine the masses and charge radii of halo nuclei (6,8He, 11Li). Also transfer reactions have been measured in many nuclei far from the stability line. In fragmentation facilities, new experimental methods such as gamma ray detection in coincidence with breakup fragments of halo nuclei have been developed. Also the reaction cross sections have been measured in a wide range of beam energies. In addition, proton elastic scattering of halo nuclei has been measured at high energies. All together, studies of density distribution, identification of shell orbitals and spectroscopic factors of halo wave function became possible. Such studies reveal many new important information such as the change of magic numbers in nuclei far from the stability line. In this article, we would like to review the experimental developments on halo nuclei and other related drip line nuclei. Also the new view of the nuclear structure learned from such studies will be discussed. Development of selected theories on related nuclear structure problems will be mentioned briefly. © 2012 Elsevier B.V. All rights reserved.

Delahaye P.,GANIL | Maunoury L.,GANIL | Vondrasek R.,Argonne National Laboratory
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2012

We present here in detail the design of the future charge breeding system of the Système de Production d'Ions Radioactifs Accélé rés en Ligne (SPIRAL) at GANIL, France. The charge breeder will be based on an optimization of an existing Phoenix ECR ion source which was formerly tested at ISOLDE, CERN. Compared to the previous prototype, the upgraded version shall include a number of modifications widely inspired from the latest results obtained with the Argonne National Laboratory CARIBU charge breeder. Those modifications are discussed here. © 2012 Elsevier B.V. All rights reserved.

Vignet J.L.,GANIL | Revenko R.,GANIL
International Beam Instrumentation Conference, IBIC 2014 | Year: 2014

Measurements of the bunch longitudinal shape of beam particles are crucial for optimization and control of LINAC beam parameters and maximization of its integrated luminosity. The non-interceptive bunch extension monitor for the LINAC of SPIRAL2 facility is being developed at GANIL. Five bunch extension monitors will be installed at the beginning of the LINAC between superconducting cavities. The principle of operation is based on the registration of x-rays induced by ions of accelerator beam interacting with a thin tungsten wire positioned on the beam path. The monitor consists of two parts: A system for wire insertion and positioning, and an x-ray detector based on microchannel plates (MCP). A detector prototype has been developed for three years and was tested using protons and heavy ions beams. The influence of the cryomodule operation on the diagnostic measurement was also studied.

Petit E.,GANIL
IPAC 2011 - 2nd International Particle Accelerator Conference | Year: 2011

This paper presents the progress of the SPIRAL2 project, the R&D and tests of the key components should be reviewed together with the main challenges for the beam production. Copyright © 2011 by IPAC'11/EPS-AG.

Lhersonneau G.,GANIL | Pfeiffer B.,Mainz University | Kratz K.-L.,Mainz University
Hyperfine Interactions | Year: 2014

We review structure data obtained by decay spectroscopy of neutron-rich nuclei of mass close to 100. Emphasis is put on the contribution of experiments at IGISOL in the nineties. They confirmed the earlier postulated shape coexistence in the fast shape-transition region between N = 58 (spherical ground states and low collectivity) and N = 60 (strong axial deformation). A detailed spectroscopic study of the A = 99 chain established the upper-Z limit of the N = 56 shell closure region with 99Nb, owing to striking similarities with 97Y. A consequence of the N = 56 closure is that the s 1/2 odd-neutron becomes the ground state of the most neutron-rich N = 57 isotones, starting with 99Mo, instead of the degenerated d 5/2 and g 7/2 subshells familiar in the tin region. Consequences on the change of spin on astrophysical r-process calculations are briefly discussed. Finally, we say a few words about neutron-rich rhodium and palladium isotopes near the neutron midshell where regular and intruder states coexist very close to each other. © 2012 Springer Science+Business Media B.V.

Gueroult E.,GANIL | Vignet J.-L.,GANIL | Weissman L.,Israel Atomic Energy Commission | Kreisel A.,Israel Atomic Energy Commission
Journal of Instrumentation | Year: 2013

A Residual Gas Monitor (RGM) developed at GANIL was tested with pulsed and CW proton beams at currents up to 1 mA at SARAF Phase I. Response of the detector as a function of beam current and duty cycle was measured. Beam profiles were measured at different beam size and position values and compared with measurements performed with a multi-wire grid profiler. Influence of the low-energy beam transfer (LEBT) optical settings on intense CW beams was studied for the first time. The obtained data enabled a better analysis and understanding of the current ramp-up process.© 2013 IOP Publishing Ltd and Sissa Medialab srl.

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