⁷Be radioactive beam production at CIRCE and its utilization in basic and applied physics

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• 作者：Benedicta Normanna Limata ; Lucio Gialanella ; Antonino Di Leva ; Nicola De Cesare ; Antonio D’ ; Onofrio ; G. Gyurky ; Claus Rolfs ; Mario Romano ; Detlef Rogalla ; Cesare Rossi ; Michele Russo ; Endre Somo
• 关键词：Radioactive ion beams ; Ion implantation ; Wear monitoring
• 刊名：Nuclear Instruments and Methods in Physics Research Section B ; Beam Interactions with Materials and Atoms
• 出版年：2008
• 期刊代码：42_0168583x
• 类别：ph
• 出版时间：May 2008
• 卷：266
• 期：10
• 页码：2117-2121
• 文件大小：387 K

摘要

A pure ⁷Be beam with an energy E = 1–8 MeV is available for nuclear and applied physics at the 3 MV Pelletron tandem accelerator CIRCE in Caserta. The beam is produced using an offline technique. Typical analyzed beam intensities are about 2 ppA, using cathodes with an activity of the order of 200 MBq. The ⁷Be implantation has been used for both fundamental nuclear physics and applied physics. In particular, different metals have been implanted with ⁷Be in order to study the influence of the chemical composition and of the number of quasi-free electrons of the host material on the ⁷Be half-life. In the field of applied physics, the ⁷Be implantation turns out to be very interesting for wear measurement. In fact, in this case ⁷Be is used as a depth-sensitive tracer. The continuous detection of the sample activity during the wear allows a high sensitivity measurement of wearing speed. The ⁷Be beam production at CIRCE, the implantation procedure and the results obtained from the ⁷Be half-life measurements and the wear characterization of implanted steel samples are described.