Freiburg 1999 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 32: Postersitzung / Kernphysik

HK 32.14: Poster

Wednesday, March 24, 1999, 10:15–12:00, Foyer

Neutron induced fission of ²³⁹Pu in the resolved resonance region — •F.-J. Hambsch, L. Demattè, and H. Bax — JRC-IRMM, Retieseweg, B-2440 Geel, Belgium

A new measurement of the fission fragments’ mass and energy characteristics of the ²³⁹Pu(n,f) reaction in the resolved resonance region has been started at the IRMM. The investigation will address the still open question whether a spin dependence of the fission fragment properties exist. A former experiment on ²³⁵U(n,f) [1] did not provide an unequivocal answer. The situation concerning the spins in ²³⁹Pu(n,f) seems more clear, with only 0⁺ and 1⁺ as possible values and an energy gap of about 1 MeV between the relevant transition states [2]. Moreover, measurements of the neutron and gamma multiplicities of ²³⁹Pu(n,f) show a remarkable (n,γf) competition that could also be observed in the average fragment total kinetic energy (TKE) [3]. The experimental details will be presented and the results will be discussed in view of their implications on the current understanding of the nuclear fission process.

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

[2] R. Walsh, et al., Proc. IV IAEA Symp. on Physics and Chemistry of Fission, IAEA Vienna (1980) p. 129.

[3] J. Fréhaut and D. Shackleton, Proc. III IAEA Symp. on Physics and Chemistry of Fission, IAEA Vienna (1974), p. 201.