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Träfflista för sökning "LAR1:cth ;pers:(Nilsson Thomas 1965);pers:(Huyse M.);pers:(Jonson Björn 1941);pers:(Ames F);conttype:(refereed)"

Sökning: LAR1:cth > Nilsson Thomas 1965 > Huyse M. > Jonson Björn 1941 > Ames F > Refereegranskat

  • Resultat 1-9 av 9
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1.
  • Cederkall, J., et al. (författare)
  • REX-ISOLDE - experiences from the first year of operation
  • 2004
  • Ingår i: Nuclear Physics A. - 0375-9474. ; 746, s. 17-21
  • Konferensbidrag (refereegranskat)abstract
    • The Radioactive beam EXperiment (REX) at CERN-ISOLDE has been commissioned and the first experiments successfully completed during 2002 and 2003. The concept used for post-acceleration has proven to be flexible and the experimental program has therefore been extended during the past year. This paper relays some experiences drawn from using the machine in the current program and also conveys some plans for the future.
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2.
  • Habs, D., et al. (författare)
  • The REX-ISOLDE project
  • 2000
  • Ingår i: Hyperfine Interactions. - 0304-3843. ; 129:1-4, s. 43-66
  • Tidskriftsartikel (refereegranskat)abstract
    • The Radioactive Beam Experiment REX-ISOLDE [1-3] is a pilot experiment at ISOLDE (CERN) testing the new concept of post acceleration of radioactive ion beams by using charge breeding of the ions in a high charge state ion source and the efficient acceleration of the highly charged ions in a short LINAC using modern ion accelerator structures. In order to prepare the ions for the experiments singly charged radioactive ions from the on-line mass separator ISOLDE will be cooled and bunched in a Penning trap, charge bred in an electron beam ion source (EBIS) and finally accelerated in the LINAC. The LINAC consists of a radiofrequency quadrupole (RFQ) accelerator, which accelerates the ions up to 0.3 MeV/u, an interdigital H-type (IH) structure with a final energy between 1.1 and 1.2 MeV/u and three seven gap resonators, which allow the variation of the final energy. With an energy of the radioactive beams between 0.8 MeV/u and 2.2 MeV/u a wide range of experiments in the field of nuclear spectroscopy, astrophysics and solid state physics will be addressed by REX-ISOLDE.
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3.
  • Jeppesen, H. B., et al. (författare)
  • Investigation of the Li-9+H-2 -> Li-8+t reaction at REX-ISOLDE
  • 2006
  • Ingår i: Physics Letters B. - 0370-2693. ; 635:1, s. 17-22
  • Tidskriftsartikel (refereegranskat)abstract
    • The one-neutron transfer reaction Li-9 + H-2 -> Li-8 + t has been investigated in an inverse kinematics experiment by bombarding a deuterated polypropylene target with a 2.36 MeV/u Li-9 beam from the post-accelerator REX-ISOLDE at CERN. Excitation energies in Li-8 as well as angular distributions of the tritons were obtained and spectroscopic factors deduced. (c) 2006 Elsevier B.V. All rights reserved.
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4.
  • Jeppesen, H. B., et al. (författare)
  • Low energy reactions with radioactive ions at REX-ISOLDE - the Li-9+H-2 case
  • 2005
  • Ingår i: Nuclear Physics A. - 0375-9474. ; 748:3-4, s. 374-392
  • Tidskriftsartikel (refereegranskat)abstract
    • At the newly constructed postaccelerator REX-ISOLDE (Radioactive beam Experiment at ISOLDE) we have investigated reactions induced by a Li-9 beam incident on a deuterium target at an energy of 2.36 MeV/u. Most reaction channels were recorded. From one-neutron transfer the differential cross-section for the low lying Li-10 spectrum is found. The results from the other channels demonstrate the great applicability and many possibilities that REX-ISOLDE opens up.
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5.
  • Kester, O., et al. (författare)
  • Accelerated radioactive beams from REX-ISOLDE
  • 2003
  • Ingår i: Nuclear Instruments & Methods in Physics Research, Section B. - Beam Interactions with Materials and Atoms. - 0168-583X. ; 204, s. 20-30
  • Konferensbidrag (refereegranskat)abstract
    • In 2001 the linear accelerator of the Radioactive beam EXperiment (REX-ISOLDE) delivered for the first time accelerated radioactive ion beams, at a beam energy of 2 MeV/u. REX-ISOLDE uses the method of charge-state breeding, in order to enhance the charge state of the ions before injection into the LINAC. Radioactive singly-charged ions from the on-line mass separator ISOLDE are first accumulated in a Penning trap, then charge bred to an A/q < 4.5 in an electron beam ion source (EBIS) and finally accelerated in a LINAC from 5 keV/u to energies between 0.8 and 2.2 MeV/u. Dedicated measurements with REXTRAP, the transfer line and the EBIS have been carried out in conjunction with the first commissioning of the accelerator. Thus the properties of the different elements could be determined for further optimization of the system. In two test beam times in 2001 stable and radioactive Na isotopes (Na-23-Na-26) have been accelerated and transmitted to a preliminary target station. There Ni-58- and Be-9- and H-2-targets have been used to study exited states via Coulomb excitation and neutron transfer reactions. One MINIBALL triple cluster detector was used together with a double sided silicon strip detector to detect scattered particles in coincidence with gamma-rays. The aim was to study the operation of the detector under realistic conditions with gamma-background from the beta-decay of the radioactive ions and from the cavities. Recently for efficient detection eight tripple Ge-detectors of MINIBALL and a double sided silicon strip detector have been installed. We will present the first results obtained in the commissioning experiments and will give an overview of realistic beam parameters for future experiments to be started in the spring 2002.
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6.
  • Niedermaier, O, et al. (författare)
  • "Safe" Coulomb excitation of Mg-30
  • 2005
  • Ingår i: Physical Review Letters. - 0031-9007. ; 94:17
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the first radioactive beam experiment performed at the recently commissioned REX-ISOLDE facility at CERN in conjunction with the highly efficient &#947; spectrometer MINIBALL. Using Mg-30 ions accelerated to an energy of 2.25 MeV/u together with a thin Ni-nat target, Coulomb excitation of the first excited 2(+) states of the projectile and target nuclei well below the Coulomb barrier was observed. From the measured relative deexcitation &#947;-ray yields the B(E2;0(gs)(+)&RARR; 2(1)(+)) value of Mg-30 was determined to be 241(31)e(2) fm(4). Our result is lower than values obtained at projectile fragmentation facilities using the intermediate-energy Coulomb excitation method, and confirms the theoretical conjecture that the neutron-rich magnesium isotope Mg-30 resides outside the "island of inversion."
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7.
  • Niedermaier, O, et al. (författare)
  • The neutron-rich Mg isotopes: first results from MINIBALL at REX-ISOLDE
  • 2005
  • Ingår i: Nuclear Physics A. ; 752, s. 273-278
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the first radioactive beam experiment performed at the recently commissioned REX-ISOLDE facility at CERN in conjunction with the highly efficient &#947; spectrometer MINIBALL. Using Mg-30 ions accelerated to an energy of 2.25 MeV/u together with a thin Ni-nat target, Coulomb excitation of the first excited 2(+) states of the projectile and target nuclei well below the Coulomb barrier was observed. From the measured relative deexcitation &#947;-ray yields the B(E2;0(gs)(+)&RARR; 2(1)(+)) value of Mg-30 was determined to be 241(31)e(2) fm(4). Our result is lower than values obtained at projectile fragmentation facilities using the intermediate-energy Coulomb excitation method, and confirms the theoretical conjecture that the neutron-rich magnesium isotope Mg-30 resides outside the "island of inversion."
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8.
  • Scheit, H., et al. (författare)
  • Coulomb excitation of neutron-rich beams at REX-ISOLDE
  • 2005
  • Ingår i: European Physical Journal A. - 1434-6001. ; 25:Suppl. 1, s. 397-402
  • Konferensbidrag (refereegranskat)abstract
    • After the successful commissioning of the radioactive beam experiment at ISOLDE (REX-ISOLDE) - an accelerator for exotic nuclei produced by ISOLDE - in 2002 and the promotion to a CERN user facility in 2003, first physics experiments using these beams were performed. Initial experiments focused on the region of deformation in the vicinity of the neutron-rich Na and Mg isotopes. Preliminary results on the neutron-rich Na and Mg isotopes show the high potential and physics opportunities offered by the exotic isotope accelerator REX in conjunction with the modern Germanium gamma spectrometer MINIBALL.
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9.
  • Stefanescu, I, et al. (författare)
  • Coulomb Excitation of 68,70Cu: First Use of Postaccelerated Isomeric Beams
  • 2007
  • Ingår i: Physical Review Letters. ; 98:12, s. 122701-4
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the first low-energy Coulomb excitation measurements with radioactive Ipi=6- beams of odd-odd nuclei 68,70Cu. The beams were produced at ISOLDE, CERN and were post-accelerated by REX-ISOLDE to 2.83 MeV/nucleon. gamma rays were detected with the MINIBALL spectrometer. The 6- beam was used to study the multiplet of states (3-, 4-, 5-, 6-) arising from the pi2p3/2nu1g9/2 configuration. The 4- state of the multiplet was populated via Coulomb excitation and the B(E2;6--->4-) value was determined in both nuclei. The results obtained illustrate the fragile stability of the Z=28 shell and N=40 subshell closures. A comparison with large-scale shell-model calculations using the 56Ni core shows the importance of the proton excitations across the Z=28 shell gap to the understanding of the nuclear structure in the neutron-rich nuclei with N[approximate]40.
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  • Resultat 1-9 av 9
 
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