Development of radioactive beams at ALTO: Part 2. Influence of the UCx target microstructure on the release properties of fission products

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

卷:440

Article

Guillot, Julien¹  Roussiere, Brigitte¹  Tusseau-Nenez, Sandrine²  Grebenkov, Denis²  Barre-Boscher, Nicole¹  Borg, Elie¹  Martin, Julien¹ 

[1] Univ Paris Saclay, Univ Paris Sud, CNRS, IN2P3,Inst Phys Nucl Orsay,UMR 8608, F-91406 Orsay, France

[2] Univ Paris Saclay, Ecole Polytech, CNRS, Lab Phys Matiere Condensee, Route Saclay, F-91128 Palaiseau, France

关键词: UCx target;    Release efficiency;    Radioactive beams;    PCA;    Fluka;    gamma-Spectroscopy;   

DOI  :  10.1016/j.nimb.2018.11.039

来源: Elsevier

【 摘 要 】

Producing intense radioactive beams, in particular those consisting of short-lived isotopes requires the control of the release efficiency. The released fractions of 11 elements were measured on 14 samples that were characterized by various physicochemical analyses in a correlated paper (Part 1). A multivariate statistical approach, using the principal component analysis, was performed to highlight the impact of the microstructure on the release properties. Samples that best release fission products consist of grains and aggregates with small size and display a high porosity distributed on small diameter pores. They were obtained applying a mixing of ground uranium dioxide and carbon nanotubes powders leading to homogeneous uranium carbide samples with a porous nanostructure. A modelling under on-line ALTO conditions was carried out using the FLUKA code to compare the yields released by an optimized and a conventional target.

【 授权许可】

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