Ch. E. Düllmann
University of Mainz
PhysicsIsotopeAtomic physicsNuclear physicsChemistry
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Publications 165
Abstract A table top setup was developed for the irradiation of thin layers with low-energy electrons and ions of gaseous species. This serves to gain a better understanding of the chemical microprocesses involved during irradiations. The gained insights will complement the understanding of heavy-ion beam induced transformations at on-line facilities and will be used to develop an accelerator-independent method to transform freshly produced targets into a long-term stable form. The pilot experim...
#2A. K. MistryH-Index: 10
Last. V. YakushevaH-Index: 3
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Abstract The neutron-deficient isotopes 254,255Rf were produced in the fusion-evaporation reaction 50Ti + 206Pb at the gas-filled recoil separator TASCA. Decay properties of these nuclei were investigated by applying fast digital electronics. A search for isomeric states in both isotopes was performed by using the accompanying conversion electron emissions. Isomeric states with half-lives of 4(1) μs and >30 μs were measured for 254Rf and 255Rf, respectively, which confirm the findings at differe...
#1C. Velte (Heidelberg University)
#2F. Ahrens (Heidelberg University)H-Index: 1
Last. Kai Zuber (TUD: Dresden University of Technology)H-Index: 32
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The determination of the effective electron neutrino mass via kinematic analysis of beta and electron capture spectra is considered to be model-independent since it relies on energy and momentum conservation. At the same time the precise description of the expected spectrum goes beyond the simple phase space term. In particular for electron capture processes, many-body electron-electron interactions lead to additional structures besides the main resonances in calorimetrically measured spectra. A...
#1Ch. Schweiger (MPG: Max Planck Society)H-Index: 1
#2C. M. König (MPG: Max Planck Society)H-Index: 1
Last. Klaus Blaum (MPG: Max Planck Society)H-Index: 47
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This paper reports on the development and testing of a novel, highly efficient technique for the injection of very rare species into electron beam ion traps (EBITs) for the production of highly charged ions (HCI). It relies on in-trap laser-induced desorption of atoms from a sample brought very close to the electron beam resulting in a very high capture efficiency in the EBIT. We have demonstrated a steady production of HCI of the stable isotope ^{165}\mathrm{Ho}from samples of only 10^{12}..
1 CitationsSource
#1K. Chrysalidis (CERN)H-Index: 5
#2J. Ballof (CERN)H-Index: 1
Last. Klaus Wendt (University of Mainz)H-Index: 33
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The production of selenium ion beams has been investigated at the CERN-ISOLDE facility via two different ionization methods. Whilst molecular selenium (SeCO) beams were produced at ISOLDE since the early 1990s, recent attempts at reliably reproducing these results have so far been unsuccessful. Here we report on tests of a step-wise resonance laser ionization scheme for atomic selenium using the ISOLDE Resonance Ionization Laser Ion Source (RILIS). For stable selenium an ionization efficiency of...
#1A. K. MistryH-Index: 10
Last. Z. Zhang (CAS: Chinese Academy of Sciences)H-Index: 3
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Abstract Fusion-evaporation reactions with the doubly magic projectile 48 Ca were used to access neutron-deficient nuclei around neptunium at the velocity filter SHIP, and investigated using the COMPASS decay spectroscopy station. With the use of digital electronics, several isotopes produced via neutron, proton, and α evaporation channels were identified by establishing correlated α -decay chains with short-lived sub-μs members. Data are given on decay chains stemming from 225,226 Np, 225 U, an...
#1Tanja HeftrichH-Index: 8
#2Mario WeigandH-Index: 11
Last. C WolfH-Index: 1
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#1K. BanerjeeH-Index: 1
#2David HindeH-Index: 40
Last. Alexander YakushevH-Index: 25
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1 CitationsSource
#1J. Khuyagbaatar (GSI Helmholtz Centre for Heavy Ion Research)H-Index: 2
#2A. Yakushev (GSI Helmholtz Centre for Heavy Ion Research)H-Index: 2
Last. V. YakushevaH-Index: 3
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The heaviest currently known nuclei, which have up to 118 protons, have been produced in 48Ca induced reactions with actinide targets. Among them, the element tennessine (Ts), which has 117 protons, has been synthesized by fusing 48Ca with the radioactive target 249Bk, which has a half-life of 327 d. The experiment was performed at the gas-filled recoil separator TASCA. Two long and two short α decay chains were observed. The long chains were attributed to the decay of 294Ts. The possible origin...
1 CitationsSource
#1J. Lerendegui-Marco (University of Seville)H-Index: 6
#2Carlos Guerrero (University of Seville)H-Index: 20
Last. P. Thörle-Pospiech (University of Mainz)H-Index: 11
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A good knowledge of the radiative capture cross section of 242Pu is required for innovative nuclear reactor studies, especially for MoX fuel reactors. However, the experimental data available show discrepancies in the energy regions of interest: the thermal point and the keV region. Previous experimental results of the thermal cross section deviate from each other by 20% and these discrepancies are reflected also in the evaluated libraries, each of them giving more credit to different data sets....