Optimization studies of the CERN-ISOLDE neutron converter and fission target system

Luís, R.; Marques, J.G.; Stora, T.; Vaz, P.; Zanini, L.

doi:10.1140/epja/i2012-12090-9

Cited by 12 publications

(9 citation statements)

References 24 publications

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“…In this case, except for unwanted scattered protons, neutrons are the projectiles producing the radioactive nuclides, which changes significantly the production cross sections, in favor of experiments on neutron-rich nuclides (zinc isotopes being a recent highlight [Kos05], [Wol13a]). Studies aimed at optimizing the neutronconverter performance are ongoing [Lui12]. The reaction products are neutralized and their kinetic energy is absorbed in the ISOL target.…”

Section: Production and Preparation Of The Ion Ensemblementioning

confidence: 99%

Binding Energy of Strongly Deformed Radionuclides

Manea

2015

Springer Theses

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The most complex nuclei are situated between the magic and the mid-shell ones, in regions known for sudden changes of the trends of nuclear observables. These are the so-called shape-transition regions, where the nuclear paradigm changes from the vibrational liquid drop to the static rotor. With few exceptions, nuclei in these regions are radioactive, with half-lives dropping into the millisecond range.Complementing the information obtained from the low-lying excitation spectrum, nuclear binding energies and mean-square charge radii are among the observables most sensitive to these changes of nuclear structure. In the present work, a study of the shapetransition phenomenon is performed by measurements of radioactive nuclides produced by the ISOLDE facility at CERN. The masses of the neutron-rich rubidium isotopes 98−100 Rb and of the neutron-deficient gold isotopes 180,185,188,190,191 Au are determined using the Penning-trap mass spectrometer ISOLTRAP. The mass of 100 Rb is determined for the first time. Significant deviations from the literature values are found for the isotopes 188,190 Au. A new experimental method is presented, using a recently developed multi-reflection time-of-flight mass spectrometer as a beam-analysis tool for resonanceionization laser spectroscopy. The new method opens the path to measurements of atomic hyperfine spectra with ISOLTRAP, from which charge radii and electromagnetic moments of radioactive nuclides can be extracted.The properties of the studied nuclides map the borders of two prominent regions of quadrupole deformation, which constrain the fine balance between pairing and quadrupole correlations in the nuclear ground states. This balance is studied by the Hartree-FockBogoliubov (HFB) approach. The sensitivity of the shape-transition phenomenon to the strength of pairing correlations is demonstrated. In particular, the strong odd-even staggering of charge radii in the mercury isotopic chain is shown to result in the HFB approach from the fine interplay between pairing, quadrupole correlations and quasiparticle blocking.

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Section: Production and Preparation Of The Ion Ensemblementioning

confidence: 99%

Binding Energy of Strongly Deformed Radionuclides

Manea

2015

Springer Theses

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“…2 have been proposed to improve the purity of neutron-rich isotopes beams, e.g. 80 Zn and 130 Cd, by reducing the production of neutron-deficient isobars 80 Rb and 130 Cs [11]. For both approaches an increase by more than one order of magnitude in the ratios 80 Zn/ 80 Rb and 130 Cd/ 130 Cs has been predicted.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…In the later case, the average fluences (proton and neutron track-length fluence spectra) over the UC x target volume is calculated with FLUKA; TALYS is used to compute cross-sections for energies up to 200 MeV and ABRABLA to calculate the cross-section from 200 MeV to 2 GeV, an energy range for a possible future energy upgrade connected to the HIE-ISOLDE project. More details about these numerical simulations can be found in [11].…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…Due to the fact that the present converter layout results in reduced ion beam intensities when compared to the direct beam configuration, alternative designs for the target system have been proposed [11]. At the same time this optimization aimed at decreasing the production of neutron-deficient species in order to improve the purity of neutron-rich-nuclear beams.…”

Section: Introductionmentioning

confidence: 99%

“…At the same time this optimization aimed at decreasing the production of neutron-deficient species in order to improve the purity of neutron-rich-nuclear beams. To test the performance of such systems and the accuracy of theoretical modeling, a prototype target and converter system, inspired by one of the proposed configurations in [11], has been built and characterized at ISOLDE with a 1.4 GeV proton beam. This paper reports on the development of this prototype and the results obtained during the experiment.…”

Section: Introductionmentioning

confidence: 99%

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Experimental tests of an advanced proton-to-neutron converter at ISOLDE-CERN

Gottberg

Mendonça

Luís³

et al. 2014

Nuclear Instruments and Methods in Physics Research Section B:

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The suppression of isobaric contaminations is of growing importance for many scientific programs using radioactive isotopes produced at isotope separation on-line (ISOL) facilities, such as ISOLDE-CERN. A solid tungsten proton-to-neutron converter has been used for ten years to produce neutron-rich fission fragments from an UCx target while suppressing the production of neutron-deficient isobaric contaminants. The remaining contamination is mainly produced by primary protons that are scattered by the heavy neutron converter and finally impinge on the UCx target itself. Therefore, the knowledge of the energy-dependant cross-sections of proton and neutron induced fission events is crucial in order to evaluate future converter concepts. In this paper, an improved neutron converter prototype design is presented together with the experimentally assessed radioisotope production of Rb, Zn, Cu, Ga and In that validate the converter concept aiming at beams of higher purity neutron-rich isotopes. The experimentally derived release efficiencies for isotopes produced by the 1.4 GeV protons available at ISOLDE are used to evaluate the Monte Carlo code FLUKA and the cross-section codes TALYS and ABRABLA, respectively

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Experimental Method and Data Analysis

Manea

2015

Binding Energy of Strongly Deformed Radionuclides

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Optimization studies of the CERN-ISOLDE neutron converter and fission target system

Cited by 12 publications

References 24 publications

Binding Energy of Strongly Deformed Radionuclides

Binding Energy of Strongly Deformed Radionuclides

Experimental tests of an advanced proton-to-neutron converter at ISOLDE-CERN

Experimental Method and Data Analysis

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