Heavy-ion beam induced effects in enriched gadolinium target films prepared by molecular plating

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

卷:407

Article

Mayorov, D. A.¹  Tereshatov, E. E.¹  Werke, T. A.^1,2  Frey, M. M.^1,2  Folden, C. M., III¹ 

[1] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA

[2] Texas A&M Univ, Dept Chem, College Stn, TX 77843 USA

关键词: Molecular plating;    Lanthanide films;    Nuclear targets;    Heavy-ion beam irradiation;   

DOI  :  10.1016/j.nimb.2017.07.012

来源: Elsevier

【 摘 要 】

A series of enriched gadolinium (Gd, Z = 64) targets was prepared using the molecular plating process for nuclear physics experiments at the Cyclotron Institute at Texas A&M University. After irradiation with Ca-48 and Sc-45 projectiles at center-of-target energies of E-cot = 3.8-4.7 MeV/u, the molecular films displayed visible discoloration. The morphology of the films was examined and compared to the intact target surface. The thin films underwent a heavy-ion beam-induced density change as identified by scanning electron microscopy and alpha-particle energy loss measurements. The films became thinner and more homogenous, with the transformation occurring early on in the irradiation. This transformation is best described as a crystalline-to-amorphous phase transition induced by atomic displacement and destruction of structural order of the original film. The chemical composition of the thin films was surveyed using energy dispersive spectroscopy and X-ray diffraction, with the results confirming the complex chemistry of the molecular films previously noted in other publications. (C) 2017 Elsevier B.V. All rights reserved.

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