[Triumf-seminars] TRIUMF Seminar today at 15:00

postmaster@admin.triumf.ca postmaster@admin.triumf.ca
Tue, 15 Feb 2005 05:00:01 -0800


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Date/Time: Tue 2005-02-15 at 15:00

Location:  Auditorium          

Speaker:   Luigi Tecchio (Legnaro, Italy)

Title:     Development of uranium carbide targets for on-line production of neutron-rich isotopes

Abstract: A series of on-line mass separation experiments have been performed at the IRIS facility to measure the yield and release of Ag, Sn, In, Rb and Cs neutron-rich isotopes produced by fission of 238U. A 1 GeV proton beam was used to bombard uranium carbide targets with densities of 11 g/cm^3 and 1.5 g/cm^3 held at temperatures in the range of 2000 - 2250 deg C. The release curves of Ag, Sn, In, Rb, and Cs long-lived isotopes were measured at different temperatures from both kinds of targets. The overall production efficiency was determined making use of experimentally measured cross-sections of that isotope production. Comparison of the experimental yields of Sn, Ag, In, Rb and Cs isotopes with the calculated ones after corrections for losses due to finite release times suggest that the diffusion is the dominating process reducing the efficiency for short-lived isotopes except for Ag for which effusion has to be also considered. When normalized to the same density, a yield enhancement is observed for the high density rod target. It is possibly explained by the reactions induced by secondary neutrons.

Stimulants available 15 minutes before the talk.

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