A. Vasilescu, L. Craciun, I. A. Ghita, C. N. Zoita, A. Kiss, Status of an R&D project of a positron gun at "Horia Hulubei'' NIPNE Bucharest, Applied Surface Science, 255/1 (2008) 46-49

Title: Status of an R&D project of a positron gun at "Horia Hulubei'' NIPNE Bucharest

Abstract: A new positron gun (PG) will enable high sensitivity measurements in applications of positron annihilation spectroscopy in Romania. Some data concerning the design of a modular system for focussing, transport and acceleration of mono-energetic positrons in the range 0.8-50 keV have been obtained and experimenting on moderators and CDBS was performed. We present a short overview of the present status of the project and preliminary results from Coincidence Doppler Broadening Spectroscopy with a (22)NaCl source, on Al samples. The entire positron gun system will be designed as a high-vacuum dedicated extension operating with two options: a 50 mCi (22)NaCl source and in-line with the NIPNE cyclotron or a new intense compact cyclotron.

Key words: positron annihilation; Coincidence Doppler Broadening