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HK: Physik der Hadronen und Kerne

HK 16: Postersitzung / Kernphysik

HK 16.27: Poster

Donnerstag, 23. März 2000, 10:15–12:45, B 69

Precise spectral measurement of the energy distribution of 7Li produced in ternary fission — •S Oberstedt1, D Rochman1, A Oberstedt2, and M Mutterer31Institut Laue-Langevin, F-38042 Grenoble — 2ITN, SE-70182 Oerebro — 3IKDA, D-64287 Darmstadt

Energy distributions and yields of ternary particles (TP) up to A=34 were measured with the recoil mass-separator LOHENGRIN in the past for a large number of fissioning systems. For the lighter elements like He, Li and Be, it was observed that some isotopes (e.g. 4He, 7Li, and 9Be) have considerably wider energy distributions compared to their neighbouring isotopes, with a higher yield especially at low kinetic energies compared to a Gaussian shape.
From a recent work on neutron-TP angular distributions in the case of 252Cf(sf) this observation has been confirmed, and it became clear that spectra of some TPs can be influenced by a secondary effect. TPs of mass A+1, which are neutron-unstable in their groundstates [5He, 7He] or their excited states [8Li*, 10Be*], are formed in ternary fission, may undergo neutron decay and eventually are detected as an TP with mass A. This would qualitatively explain the additional low-energy component in the observed kinetic-energy distributions .
For attaining a quantitative picture spectral measurements of the above isotope with LOHENGRIN have been performed. For the first time absorber foils were used for the investigation of the high-energy part.
The measurement technique as well as first experimental results will be presented.

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DPG-Physik > DPG-Verhandlungen > 2000 > Dresden