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

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:336

Article

Gottberg, A.^1,2  Mendonca, T. M.^1,3,4  Luis, R.⁵  Ramos, J. P.^1,6  Seiffert, C.^1,7  Cimmino, S.¹  Marzari, S.¹  Crepieux, B.¹  Manea, V.⁸  Wolf, R. N.⁹  Wienholtz, F.⁹  Kreim, S.^1,10  Fedosseev, V. N.¹  Marsh, B. A.¹  Rothe, S.¹  Vaz, P.⁵  Marques, J. G.⁵  Stora, T.¹ 

[1] CERN, European Org Nucl Res, CH-1211 Geneva 23, Switzerland

[2] CSIC, Inst Estruct Mat, Consejo Nacl Pesquisas Cient, E-28006 Madrid, Spain

[3] IFIMUP, P-4169007 Oporto, Portugal

[4] IN Inst Nanosci & Nanotechnol, P-4169007 Oporto, Portugal

[5] Inst Super Tecn, P-2695066 Bobadela Lrs, Portugal

[6] Ecole Polytech Fed Lausanne, CH-1015 Lausanne, Switzerland

[7] Tech Univ Darmstadt, D-64289 Darmstadt, Germany

[8] Univ Paris 11, CSNSM IN2P3 CNRS, F-91405 Orsay, France

[9] Ernst Moritz Arndt Univ Greifswald, Inst Phys, D-17487 Greifswald, Germany

[10] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

关键词: Proton-to-neutron converter;    Spallation neutron source;    Isotope separation on-line (ISOL);    ISOLDE;    Radioactive ion beams (RIB);   

DOI  :  10.1016/j.nimb.2014.04.026

来源: Elsevier

【 摘 要 】

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. (C) 2014 Published by Elsevier B.V.

【 授权许可】

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