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  • Result 1-35 of 35
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1.
  • Niedermaier, O., et al. (author)
  • "Safe" Coulomb excitation of Mg-30
  • 2005
  • In: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 94:17, s. 172501 (artno)-
  • Journal article (peer-reviewed)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 γ 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 γ-ray yields the B(E2;0(gs)(+)→ 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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2.
  • Niedermaier, O., et al. (author)
  • The neutron-rich Mg isotopes: first results from MINIBALL at REX-ISOLDE
  • 2005
  • In: Nuclear Physics A. - : Elsevier BV. - 0375-9474. ; 752, s. 273-273
  • Journal article (peer-reviewed)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 γ 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 γ-ray yields the B(E2;0(gs)(+)→ 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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3.
  • Scheit, H., et al. (author)
  • Coulomb excitation of neutron-rich beams at REX-ISOLDE
  • 2005
  • In: European Physical Journal A. - : Springer Science and Business Media LLC. - 1434-601X .- 1434-6001. ; 25:Suppl. 1, s. 397-402
  • Conference paper (peer-reviewed)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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4.
  • Kester, O., et al. (author)
  • Accelerated radioactive beams from REX-ISOLDE
  • 2003
  • In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 204, s. 20-20
  • Conference paper (peer-reviewed)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
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  • Fitting, H.-J., et al. (author)
  • Cluster growth and luminescence in ion-implanted silica
  • 2008
  • In: EMC 2008 14th European Microscopy Congress 1–5 September 2008, Aachen, Germany Volume 2: Materials Science. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 9783540852254 - 9783540852261 ; , s. 17-18
  • Conference paper (peer-reviewed)
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19.
  • Fitting, H.-J., et al. (author)
  • Luminescent Defect Dynamics in Amorphous SiO2:H
  • 2005
  • In: Physica Status Solidi. C, Current topics in solid state physics. - : Wiley. - 1610-1634 .- 1610-1642. ; 2, s. 693-698
  • Journal article (peer-reviewed)
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20.
  • Fitting, H.-J., et al. (author)
  • Multimodal electronic-vibronic spectra of luminescence in ion-implanted silica layers
  • 2007
  • In: Journal of Luminescence. - : Elsevier BV. - 0022-2313 .- 1872-7883. ; 122-123, s. 743-746
  • Journal article (peer-reviewed)abstract
    • Thermally oxidized SiO2 layers of 100 and 500 nm thickness have been implanted by oxygen and sulfur ions with a dose of 3×1016 and 5×1016 ions/cm2, respectively, leading to an atomic dopant fraction of about 4 at.% at the half depth of the SiO2 layers. The cathodoluminescence spectra of oxygen and sulfur implanted SiO2 layers show besides characteristic bands a sharp and intensive multimodal structure beginning in the green region at 500 nm over the yellow-red region extending to the near IR measured up to 820 nm. The energy step differences of the sublevels amount on average 120 meV and indicate vibration associated electronic states, probably of O2-interstitial molecules, as we could demonstrate by a respective configuration coordinate model.
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  • Fitting, H.-J., et al. (author)
  • Multimodal Luminescence Spectra of Ion-implanted Silica
  • 2007
  • In: Semiconductors. - : Pleiades publishing. ; 41, s. 453-457
  • Journal article (peer-reviewed)abstract
    • The main luminescence bands in silica SiO2are the red luminescence R (650 nm, 1.9 eV) of thenon-bridging oxygen hole center, and the blue band B (460 nm, 2.7 eV) and ultraviolet luminescence UV (290 nm,4.3 eV), both commonly related to oxygen-deficient centers. In the present work, we will enhance or replaceeither the first or second constituent of SiO2, i.e., silicon or oxygen, isoelectronically by additional implantationof the respective ions. Thus, thermally oxidized SiO2layers have been implanted by different ions of theIV group (C, Si, Ge, Sn, Pb) and of the VI group (O, S, Se) with doses up to 5×1016cm–2, leading to an atomicdopant fraction of about 4 at % at the half depth of the SiO2layers. Very surprisingly, the cathodoluminescencespectra of oxygen- and sulfur-implanted SiO2layers show, besides the characteristic bands, a sharp and intensivemultimodal structure beginning at the green region at 500 nm up to the near infrared. The energy step differencesof the sublevels equal on average 120 meV, and indicate vibration associated electronic states, probablyof interstitial molecules.
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  • Result 1-35 of 35

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