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Dresden 2000 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 16: Postersitzung / Kernphysik

HK 16.24: Poster

Thursday, March 23, 2000, 10:15–12:45, B 69

Unexpected results from 239Pu(n,f) in the resolved resonance region — •F.-J. Hambsch, L. Demattè, and H. Bax
EC-JRC-IRMM, Retieseweg, B-2440 Geel, Belgium

The measurement of the mass and total kinetic energy (TKE) distributions of 239Pu(n,f) in the resonance energy region has revealed unexpected results. Unlike it was the case for 235U(n,f) [1] in the same energy region, no strong fluctuations have been observed for the mass and TKE distributions for resolved resonances. In fact such fluctuations have been expected for the fission fragment properties, because the only possible low-energy spin states (Jπ=0+, 1+) belong to two well separated (about 1.25 MeV) transition state bands. No spin dependence nor a depencdence on νp or 1/Γf has been found in the energy region above 1 eV. The only exception might be the resonance at 0.3 eV. The results will be presented and discussed.

[1] F.-J. Hambsch et al., Nucl. Phys. A491, 56 (1989)

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