Paper Title:
Diffusion Process of 8Li for Radioactive Beam Production
  Abstract

By bombarding a target with stable ion beams it is possible to produce nuclear radioactive species. The EXCYT facility at the Istituto Nazionale di Fisica Nucleare - Laboratori Nazionali del Sud (INFN-LNS), in Catania, is based on a K-800 superconducting cyclotron injecting high intensity beam (up to 500 W) in a Target Ion Source (TIS) assembly, and on a 15 MV Tandem for post-accelerating the Radioactive Ion Beams (RIB). Radioactive species are produced in a solid porous target where, by diffusion, they will reach the target surface. After effusion through the target container, radioactive atoms are ionized, extracted at low energy, and changed in charge (if needed). Two stages of isobaric mass separators will clean the resulting radioactive beam from contaminants, thus the RIB is injected into the Tandem for the post-acceleration. TIS is operating at high temperature (up to 2700 K) under vacuum (10-4 mbar). The production of 8Li radioactive beam was performed by injecting a 13C4+ primary beam of 45 MeV/u on a porous graphite target. In this work we present a study to optimize the target geometry in order to increase the production of the RIB. Our first RIB was 8Li which mean life time is 1.212 s. The generation density of 8Li inside the solid target is calculated by EPAX II code. A simple diffusion model which takes into account either the nuclei generation and their decay, was computer simulated to estimate the efficacious diffusion coefficient of 8Li in porous graphite which resulted to be in the range of 10-6 - 10-5 cm2/s. Since the porous nature of the target, many diffusion mechanisms are active, our assumption, supported by experimental evidence, is that at such high temperature multi-grain diffusion prevails. Diffusion length inside the target of 8Li, before its decay, resulted to be sensible smaller than the target size, therefore we modified its geometry enhancing the RIB production by a factor of 3-4.

  Info
Periodical
Defect and Diffusion Forum (Volumes 283-286)
Edited by
Andreas Öchsner, Graeme E. Murch and Ali Shokuhfar
Pages
200-208
DOI
10.4028/www.scientific.net/DDF.283-286.200
Citation
M. Re, L. Celona, F. Chines, G. Cuttone, D. Garufi, G. Messina, D. Rifuggiato, D. Rizzo, "Diffusion Process of 8Li for Radioactive Beam Production", Defect and Diffusion Forum, Vols. 283-286, pp. 200-208, 2009
Online since
March 2009
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Donatella Puglisi, Gaetano Foti, Giuseppe Bertuccio
Abstract:The achievement of nuclear detectors in Silicon Carbide imposes severe constraints on the electronic quality and thickness of the material...
857
Authors: D. Schlehuber, Egbert Wessel, Lorenz Singheiser, T. Markus
Abstract:One possibility to run a zero CO2-emission power plant is the oxyfuel combustion process. An efficient technology to separate oxygen from air...
551
Authors: M.A. Falkenberg, D. Abdelbarey, Vitaly V. Kveder, Michael Seibt
Abstract:The efficiency of solar cells produced from crystalline silicon materials is considerably affected by the presence of metal impurities. In...
229
Authors: S. Korichi, A. Bensmaili, Mourad Keddam
Abstract:The effect of compaction of bentonite on the diffusion behavior of uranium was studied for the safety assessment of radioactive waste...
275
Authors: D. Prokoshkina, A.O. Rodin, V. Esin
Chapter 3: Nanomaterials and Grain Boundaries
Abstract:The temperature dependence of the bulk diffusion coefficient of Fe in Cu is determined by EDX in the temperature range from 923 to 1273 K, ,...
171