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ISOLDE Workshop and Users meeting 2010

8–10 Dec 2010
CERN
Europe/Zurich timezone

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  1. 1. Recent results on transfer reactions using the MINIBALL/T-REX set up
    Thorsten Kroell (TU Darmstadt)
    08/12/2010, 09:10
    In the last few years the investigation of one- and two-neutron transfer reactions has become a new versatile tool to study the structure of exotic nuclei at REX-SOLDE. So far, we have investigated the (d,p) and (t,p) reaction in inverse kinematics on several nuclei with masses up to A = 80. The powerful combination of the MINIBALL spectrometer and the T-REX Si detector array enables the...
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  2. 16. Single-particle states in 79Zn and the N=50 shell gap near 78Ni
    Dr Riccardo Orlandi (IEM - CSIC Madrid, Spain)
    08/12/2010, 09:40
    Neutron-rich nuclei with magic numbers of neutrons and protons are reference points to map and understand the reorganization of the shell structure away from the line of beta stability. Experiment IS491 aimed at the study of single-particle properties of 79Zn, which lies only 2 protons above and 1 neutron below the Z=28 and N=50 shell closures of 78Ni. The sizes of these shell gaps, from which...
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  3. 33. Recent results from the HRIBF
    Kate Jones (University of Tennessee)
    08/12/2010, 10:00
    The development of fission fragment and proton-rich beams1 at the Holifield Radioactive Ion Beam Facility (HRIBF)2, along with the availability of batch mode beams of 7,10Be and 26Al, has led to unique research of nuclear structure close to the shell closures, and reactions of relevance to nuclear astrophysics. Additionally, recent access to intense low-energy beams directly from the RIB...
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  4. 15. Nuclear structure studies of the neutron-rich rubidium isotopes using Coulomb excitation
    Mr Christophe Sotty (CSNSM Centre de Spectrometrie Nucle aire et de Spectrometrie de)
    08/12/2010, 10:30
    We report on the first study of properties of excited states of odd-mass neutron-rich rubidium isotopes by the Coulomb excitation technique, using the Miniball array coupled to the REX-ISOLDE facility. This allowed the expected change in shape from a spherical to a deformed one at N=60 to be observed for excited states in these nuclei. These results aid the understanding of the...
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  5. 41. Collinear laser spectroscopy at ISOLDE and recent results.
    Rainer Neugart (Institut für Physik and Institut für Kernchemie, University of Mainz)
    08/12/2010, 11:15
    Thirty years of collinear laser spectroscopy at ISOLDE have yielded a large number of nuclear spins, magnetic moments, electric quadrupole moments and mean square charge radii. The experiments were not just collecting nuclear data, but continuously improving the method by combining it with different detection techniques. Thus the measurements became increasingly sensitive and accurate, coping...
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  6. 18. Implementation of a MR-ToF isobar separator at ISOLTRAP and first online results
    Mr Robert Wolf (Ernst-Moritz-Arndt University Greifswald, Germany)
    08/12/2010, 11:45
    The Penning-trap mass spectrometer ISOLTRAP performs precision mass measurements at the isotope separator ISOLDE/CERN with a relative mass uncertainty routinely reaching δm/m≈1x10-8 [1]. The time-of-flight ion-cyclotron-resonance (ToF-ICR) detection technique is employed to determine the frequency of ions stored in a Penning trap, from which their mass can be extracted [2]. Nuclides with...
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  7. 21. Magnetic dipole moment of the Coulomb excited 2+1 state in 138Xe - final report from IS415 and future of the Transient Field technique at REX-ISOLDE
    Joerg Leske (IKP, TU Darmstadt, Schlossgartenstrasse 9, D-64289 Darmstadt, Germany)
    08/12/2010, 12:05
    The isospin structure of nuclear excited states would preferably be investigated by observables which are most sensitive to it, e.g. nuclear magnetic moments. IS415 has started as one of the first attempts to measure the magnetic dipole moments of short-lived excited nuclear states at radioactive ion-beam facilities. We will report on the result obtained from this experimental campaign on the...
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  8. 22. First combined DSAM and Coulomb excitation experiment at REX-ISOLDE - measuring the sign of the spectroscopic quadrupole moment of the 2+1 state in neutron-rich 140Ba
    Christopher Bauer (IKP, TU Darmstadt, Schlossgartenstrasse 9, D-64289 Darmstadt, Germany)
    08/12/2010, 12:25
    The importance of precise lifetime information has recently been demonstrated in experiments at REX-ISOLDE and MINIBALL using the sensitivity of the Coulex yields to the nuclear reorientation effect in order to determine the sign of the spectroscopic quadrupole moment of the 2+1 state in 70Se [1,2]. Therefore we have utilized a new combined technique of lifetime measurement using the...
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  9. 35. Inorganic Nanoparticles as Functional Building Units for Composite Particles
    Tito Trindade (University of Aveiro)
    08/12/2010, 14:00
    Invited
    Solid State I
    Inorganic nanoparticles have been investigated as components in various functional materials and devices for diverse applications. These nanomaterials can be prepared as pure phases or as multi-phase materials which in turn are used as fillers in polymer matrices in order to fabricate nanocomposites. In this communication chemical aspects that have been particularly relevant in our research...
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  10. 17. Perturbed Angular Correlations studies of Hg coordination mechanisms on functionalized magnetic nanoparticles
    Vitor Bras de Sequeira Amaral (Universidade de Aveiro, Department of Physics, CICECO, Portugal)
    08/12/2010, 14:30
    Accepted
    Solid State I
    Water pollution by trace heavy metals (such as mercury, cadmium) is a serious environmental and public problem. The development of efficient new materials and clean-up technologies for removing those metals from water to within the legal admissible concentrations is urgent. In the last few years, a new type of eco-nanomagnets composed of amorphous SiO2 shells coating magnetite (Fe3O4)...
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  11. 19. Laplace Deep Level Spectroscopy ... a new tool for semiconductor research at ISOLDE
    Prof. Anthony Peaker (Photon Science Institute, University of Ma)
    08/12/2010, 14:50
    Accepted
    Solid State I
    A comprehensive understanding of impurities and lattice defects has been central to the development of semiconductor devices. The electronic properties of these impurities depend on the chemical species, the site of the impurity in the lattice and its possible complexing with other impurities and lattice defects such as vacancies. A very important tool in the study of defects and impurities is...
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  12. 25. Direct identification of interstitial Mn in Ga1−xMnxAs and evidence of its high thermal stability
    Lino Pereira (IKS KU leuven)
    08/12/2010, 15:10
    Accepted
    Solid State I
    The lattice location of Mn in GaAs has been intensively studied in recent years due to its crucial role on the magnetic properties of Ga1−xMnxAs, one of the most studied dilute magnetic semiconductors. Maximum Curie temperatures (TC) are usually achieved after low temperature annealing (~200ºC), which is generally attributed to out-diffusion of interstitial Mn (MnI). However, despite major...
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  13. 0. The HIE-ISOLDE Project
    Yacine Kadi (CERN)
    08/12/2010, 15:55
    The HIE-ISOLDE project will be an important upgrade of the existing ISOLDE radioactive ion-beam facility at CERN. The present energy of 3MeV/u for post-accelerated radionuclides will be boosted to up to 10MeV/u which will allow experiments to address many more exotic nuclides using, e.g., Coulomb excitation and nucleon transfer. A R&D program on the superconducting linear accelerator is...
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  14. 32. Research and development activities for the HIE-ISOLDE linac
    Matteo Pasini (CERN)
    08/12/2010, 16:25
    The talk will illustrate the research and development activities within the HIE-ISOLDE project, mostly focusing on the cavity development and report on the preliminary results of the cold RF tests.
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  15. 7. Beam Dynamics and Beam Characteristics of the HIE-ISOLDE Linac
    Mr Matthew Fraser (University of Manchester, Cockcroft Institute and CERN)
    08/12/2010, 16:45
    The upgrade of the REX-ISOLDE post-accelerator foreseen within the HIE-ISOLDE framework is presented along with a summary of the expected beam characteristics calculated using recent measurements at REX as input to end-to-end beam dynamics simulations of the linac.
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  16. 28. Radiation protection and radiation safety issues for HIE-ISOLDE. FLUKA calculations.
    Yuriy Romanets (CERN)
    08/12/2010, 17:05
    The production of radioactive ion beams (RIB) is worldwide a scientific topic of great interest. Continuous and significant improvements of the particle accelerator and targets technologies opens new potentialities for the production of RIBs and their use for fundamental and applied science, with increasing intensities and new types of beams available to perform measurements. The High...
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  17. 45. Overview of first ATLAS results with LHC 2010 data and prospects for 2011
    Dr Daniel Froidevaux (CERN)
    08/12/2010, 17:25
    This presentation will cover some highlights of the first physics results obtained with the ATLAS detector during the LHC operation in 2010 with proton-proton collisions at 7 TeV centre-of-mass energy and during the recently completed first heavy-ion operation with lead-lead ions colliding at 2.76 TeV per nucleon. The first Standard Model measurements will be covered as well as first results...
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  18. 39. Present and future at GANIL
    Heloise Goutte (GANIL)
    09/12/2010, 10:20
    In this talk I will present some recent experimental and theoretical results obtained at GANIL. Then I will detail the SPIRAL2 project, and the theoretical developments that have been undertaken recently to describe nuclear structure properties of exotic nuclei and nuclear reactions.
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  19. 8. Neutrino-mass oriented spectrometry at ISOLTRAP
    Dr Susanne Kreim (Max Planck Institute for Nuclear Physics, Heidelberg)
    09/12/2010, 10:50
    Precision mass measurements are performed at the mass spectrometer ISOLTRAP with a relative mass uncertainty routinely reaching 1*10^-8. The time-of-flight detection technique is employed to determine the frequency of an ion stored in a Penning trap, from which the mass can be extracted. One topic, which has been studied at ISOLTRAP recently, involves the neutrino mass determination....
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  20. 23. Recent developments and results of WITCH
    M. Breitenfeldt (K.U.Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium)
    09/12/2010, 11:10
    The WITCH set-up (Weak Interaction Trap for Charged Particles) that was installed at ISOLDE/CERN combines a double Penning trap system to store radioactive ions and a retardation spectrometer to probe the energy of the daughter recoil ions [1]. The primary aim is to search for scalar and/or tensor interactions in nuclear beta decay by precisely determining the beta-neutrino angular correlation...
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  21. 6. The impact of the development of the Resonance Ionization Laser Ion Source (RILIS) on nuclear astrophysics at ISOLDE.
    Prof. Karl-Ludwig Kratz (Max-Planck-Institut für Chemie, Otto-Hahn Institut), Prof. William Walters (University of Maryland)
    09/12/2010, 11:30
    2010 marks the 25th anniversary of the first measurement of the half-life of 130Cd at ISOLDE (1985) and the 15th anniversary of the first measurement of the decay of neutron-rich Ag isotopes (1995) ionized via Resonance Ionization Laser Ion Source (RILIS). Since that time, the nuclear decay properties of neutron-rich nuclei lying in and near the proposed path of the astrophysical r-process...
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  22. 30. ISOLDE RILIS: from proof of principle to a standard versatile technique.
    Valentin Fedosseev (CERN)
    09/12/2010, 12:00
    The high efficiency and selectivity of laser ionization in a hot cavity has been proven at ISOLDE off-line mass separator in 1989. Following the first on-line demonstration of laser-ionized Yb radioactive isotopes at ISOLDE-3, the technique has served for a great number of ISOLDE experiments. Today, the laser ion source named RILIS is one of principal ion sources used at ISOLDE and other...
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  23. 29. Target and Ion Source development at CERN-ISOLDE
    Thierry Stora (CERN)
    09/12/2010, 12:30
    The presentation will report on the new beams made available in 2010 at ISOLDE. It will also provide some feedback on how the beams were produced this year, and some options for future improvements. Some of the highlights are the unexpected Fe beam produced with a VADIS ion source and a submicron target, the delivered neutron rich Au beams, and the replacement of the traditional MK3 FEBIAD on...
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  24. 38. Plasma ion source development for molecular radioactive ion beams
    Pekka Suominen (CERN)
    09/12/2010, 12:50
    Increased ionization efficiencies for light noble gases and molecules are still required for new physics experiments, in present facilities like ISOLDE and for future installations such as EURISOL. In order to improve these beams, two new plasma ion sources are implemented on to the ISOLDE target ion source base. The first one is a COMIC-type ion source operating at 2.45 GHz and equipped...
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  25. 10. Safety at ISOLDE
    Mrs Ana-Paula Bernardes (CERN)
    09/12/2010, 14:30
    As any complex experiment, ISOLDE concentrates all type of hazards, highlighted by its radiological context link to the use of actinide targets. The future increase of energy and intensity, with the HIE-ISOLDE project, will increase or bring new hazards into the facilities as well as new safety constraints, such as ALARA procedures and Safety files for experiments, facilities or projects. This...
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  26. 27. The new fast tape station at ISOLDE
    Tim Giles (CERN)
    09/12/2010, 14:50
    We present the latest results from the new fast tape-station installed at Isolde. With a transport time of 200ms and the ability to make in-beam measurements, we are able to make accurate yield and release measurements of very short-lived isotopes, down to half-lives of just a few milliseconds.
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  27. 5. The new physics possibilities with HIE-ISOLDE
    Mark L Huyse (Instituut voor Kern- en Stralingsfysica)
    09/12/2010, 15:10
    The HIE-ISOLDE project is advancing fastly (see the dedicated website http://hie-isolde.web.cern.ch/HIE-ISOLDE/). An overview will be given on the new physics possibilities emerging, mainly focussing on the energy upgrade.
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  28. 20. HELIOS: a new approach to studying transfer reactions in inverse kinematics
    Dr Benjamin Kay (Argonne National Laboratory)
    09/12/2010, 15:40
    The new helical-orbit spectrometer, HELIOS [1,2], at Argonne National Laboratory (ANL) provides a way of studying transfer reactions in inverse kinematics that circumvents the problems traditionally associated with this reaction mode: low resolution brought on by the rapidly changing laboratory energy with angle, and a kinematic compression at forward c.m. angles. This is achieved by...
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  29. 24. Simulations of transfer reactions at HIE-ISOLDE
    Mrs Gry Tveten (University of Oslo)
    09/12/2010, 16:10
    The planned High Intensity and Energy (HIE) upgrade of the radioactive beam facility ISOLDE will enable post-acceleration of radioactive beams up to an energy of about 10 MeV/u, thus opening the door to nuclear reaction studies. In the case of transfer reactions in inverse kinematics a recoil separator is often well suited to tell recoils and beam apart and to select the exit channel. A set...
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  30. 12. Possibilities provided by ISOLDE for tracer diffusion experiments
    Prof. Thomas Wichert (Technische Physik, Universität des Saarlandes, D-66041 Saarbrücken, Germany)
    09/12/2010, 16:50
    Accepted
    Solid State II
    Radiotracer experiments, in general, have turned out as a powerful tool for the study of diffusion phenomena in solids [1]. In this contribution, diffusion experiments have been performed using the unique abundance of radiotracers delivered by ISOLDE. In this way, it has been possible to show that in CdTe the group I elements 67Cu, 111Ag, 193Au, and 24Na exhibit the phenomenon of uphill...
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  31. 43. Recent Mossbauer results using 119In
    Dr Karl Johnston (ISOLDE/CERN)
    09/12/2010, 17:10
    Accepted
    Solid State II
    119Sn Mössbauer spectroscopy utilizing implantation of 119In (T½=2.4 min) has been performed at ISOLDE for the first time in over two decades. Development(s) in data aqusition and analysis techniques allow us to obtain more information from these experiments than was possible in the past. New findings in group IV semiconductors and oxides (ZnO, MgO and Al2O3) will be presented and discussed.
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  32. 14. The sign of the electric field gradient of wide bandgap semi-conductors measured with β-γ angular correlation
    Mr Patrick Kessler (Helmholz-Institut für Strahlen- und Kernphysik der Universität Bonn)
    09/12/2010, 17:30
    Accepted
    Solid State II
    The sign of the electric field gradient can be measured with the β-γ-perturbed angular correlation. This can help in the understanding and improvement of current models and simulations of crystal structures. In this work the wide bandgap semiconductors AlN,GaN and ZnO are investigated.. The results from the last two collections at ISOLDE are presented. 115Cd and 111Ag were implanted in 3µm...
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  33. 42. Recent results using radiotracer PL at ISOLDE
    Mr Joseph Cullen (School of Physical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland)
    09/12/2010, 17:50
    Accepted
    Solid State II
    The results of photoluminescence (PL) studies on ZnO implanted with radioactive As → Ge and Ga → Ge isotopes are described. In both cases, identical PL effects are observed, indicating that identical daughter Ge defects are created. We conclude, on the basis of the well-established result that Ga occupies Zn sites, that implanted As also occupies Zn sites in ZnO. This finding corroborates...
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  34. 44. Beta-NMR as a novel technique using radioactive beams for biophysical studies
    Alexander Gottberg (University of Copenhagen)
    09/12/2010, 18:10
    Accepted
    Solid State II
    Beta-NMR is a technique which has been successfully applied at ISOLDE in solid state and nuclear physics for several decades [Arn87, Cho03, Kee08]. Due to physical-technical boundaries this technique has never been applied to soft matter investigation, although it holds great promise for numerous applications. Beta-NMR is based on the implantation of a radioactive ion beam carrying a...
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  35. 31. Reactions induced by 11Be beam at Rex-Isolde
    Alessia Di Pietro (INFN Catania)
    10/12/2010, 09:00
    Elastic scattering and reaction mechanisms around the barrier, in reaction induced by halo nuclei, has been the object of many publications in the last years (see e.g. [1-3] and ref. therein). In collisions induced by halo nuclei, direct reactions, as for instance transfer or break-up, may be favored owing to the low binding energy, the extended tail of the matter distribution and the large...
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  36. 4. Transfer reactions with T-REX for 11Be
    Dr Karsten Riisager (CERN)
    10/12/2010, 09:30
    Results presented for the IS430, the T-REX and the Miniball collaborations. The aim of IS430 is to test our understanding of the halo nucleus 11Be and its structural relation to the neighbouring nuclei 10Be and 12Be through one-neutron transfer reactions. A first run in 2005 employing only charged particle detectors gave encouraging results, but showed that gamma-ray detection is needed to...
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  37. 36. Frequency-Comb Based Optical Isotope Shift Measurement of Be-12
    Andreas Krieger (University of Mainz), Christopher Geppert (University of Mainz)
    10/12/2010, 09:50
    Charge radii measurements of the lightest elements are benchmark tests for nuclear structure calculations. In this part of the nuclear chart, ab-initio models that treat the nuclei as consisting of individual nucleons which interact via nucleon-nucleon and three-nucleon forces are available. Moreover, the appearance of the so-called halo nuclei, having an extended nuclear matter distribution...
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  38. 34. The Radioactive Ion Beam Factory: recent results, present status and perspectives
    Heiko Scheit (RIKEN)
    10/12/2010, 10:10
    The current status of the Radioactive Ion Beam Factory at the RIKEN Nishina Center will be presented. The facility is based on a new heavy-ion accelerator complex which can deliver very intense beams of nearly all elements, including Uranium, to the new two-stage in-flight fragment separator BigRIPS, to produce high-energy radioactive ion beams, which can be used at several experimental...
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  39. 26. Study of single particle structure of 35Si
    Nobuaki Imai (Institute of Particle and Nuclear Studies, KEK)
    10/12/2010, 10:40
    We report on an experimental study which investigated a shell structure in the neutron-rich N=20 region. A lot of experimental works have been made to pin down the nuclear structure around 32Mg, and the results are consistently interpreted that the magic number N=20 disappears in this region. In the framework of shell model, such a shell evolution may be attributed to the variation of the...
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  40. 2. Beta delayed fission studies of the neutron deficient Tl and Fr nuclei.
    Mrs Valentina Liberati (Univ. of West of Scotland (UWS) and SUPA)
    10/12/2010, 11:30
    The beta delayed fission (βDF) (EC/β + ) is a rare nuclear process which couples fission and beta decay. In this process, a parent nucleus undergoes beta decay, possibly populating high-lying states in the daughter nucleus, close to the top of the fission barrier, thus allowing the fission of the daughter to be competitive with other decay modes. This process is expected to occur in the heavy...
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  41. 3. Measurements of octupole collectivity in 220,222Rn and 222,224Ra using Coulomb excitation
    Mr Liam P. Gaffney (Oliver Lodge Laboratory-University of Liverpool-UK)
    10/12/2010, 11:50
    There is considerable theoretical and experimental evidence that atomic nuclei can assume reflection asymmetric shapes that arise from the octupole degree of freedom [1]. The associated phenomena that is observed include odd-even staggering of the positive- and negative-parity yrast bands in even-even nuclei, parity doublets in odd mass nuclei [2,3], and enhanced E1 moments due to a division...
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  42. 9. Measurements of competing structures in neutron-deficient Pb isotopes by employing Coulomb excitation
    Dr Janne Pakarinen (Conseil Europeen Recherche Nucl. (CERN))
    10/12/2010, 12:10
    One of the goals of modern nuclear physics research is to understand the origin of coexisting nuclear shapes and exotic excitations and their relation to the fundamental interactions between the nuclear constituents. These subjects can be investigated particularly well in the Pb isotopes close to neutron mid-shell, where a relatively small proton shell gap, together with a large valence...
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  43. 40. Total Absorption Spectroscopy at Isolde; Past, Present and Future
    Berta Rubio (University of Valencia)
    10/12/2010, 12:30
    Total Absorption Spectroscopy (TAS) is an essential technique to measure beta decay BGT distributions free of systematic errors (“Pandemonium Problem”).The TAS spectrometer “Lucrecia” , the largest TAS spectrometer presently operating, was installed at ISOLDE with this purpose. The scientific programme so far has been focused on the investigation of ground states nuclear shapes. They are...
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  44. 11. The CRIS experiment: progress and highlights from 2010
    Dr Bradley Cheal (University of Manchester)
    10/12/2010, 12:50
    Over the last two years a new experimental beam line has been designed and installed to perform collinear resonant ionization spectroscopy (CRIS) experiments at ISOLDE. The initial series of experiments will study the francium isotopes up to and including 201Fr and 218,219Fr. This work aims at answering questions on the ordering of quantum states, and effect of the 1/2+ intruder state, which...
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  45. 13. Experiments with stored highly-charged ions at ISOLDE: TSR@HIE-ISOLDE proposal
    Prof. Klaus Blaum (MPI-K, Heidelberg)
    Accepted
    Experiments with exotic nuclei stored in a ring have shown a huge potential in the last years. Such experiments profit from high revolution frequencies of stored beams which allows to 'recycle' the exotic nuclei and from low background conditions. New experimental ideas have been proposed in addition to the well-established scientific programs on mass and half-life measurements [1]. For...
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  46. 37. Introduction
    Yorick Blumenfeld (CERN)
    Welcome the participants and give some information on the implementation of the ENSAR contract at CERN/ISOLDE.
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