Bochum 1998 – scientific programme
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HK: Hadronen und Kerne
HK 51: Spectroscopy VIII, Fission
HK 51.3: Talk
Wednesday, March 18, 1998, 14:30–14:45, E
Ternary Particles from the Reactions 229Th(nth,f) and 239Pu(nth,f) — •M. Wöstheinrich1, R. Pfister1, F. Gönnenwein1, H. Faust2, and S. Oberstedt2 — 1Physikalisches Institut, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen — 2Institut Laue-Langevin, F-38042 Grenoble
The emission of ternary particles from the fission reactions 229Th(nth,f) and 239Pu(nth,f) has been studied at the HFR of the Institut Laue-Langevin. Energy distributions were measured with the mass spectrometer Lohengrin for several ternary particles having not been observed in the past. These measurements form part of a systematic study of the yields of ternary particles originating in low energy fission of the actinides from Th up to Cf. Special emphasis is given to the search for the heaviest ternary particle still detectable with the present experimental technique. The mass/charge of these particles appears to depend on the mass/charge of the fissioning compound nucleus. A clear indication for this suggestion has been found in former experiments, e.g. in the reactions 233U(nth,f) and 242Am(nth,f), where it was observed that ternary particles with masses A heavier than A=24 are emitted with sizable yields only in fission of the heavier Am compound [1], [2]. The results from the present experiment are in line with the above findings.
[1] M. Wöstheinrich et al., ILL report 1996
[2] M. Hesse et al., Proc. 3rd DANF, Casta-Papiernicka, Slovakia, 1996 Supported by the BMBF, Bonn, under contract number 06Tü669