Objective
The basic physics of nuclear reactions induced by neutrons has always been at the focus of interest in the NIS states. Besides pioneering technical developments it has been the close collaboration between experimental and theoretical physicists, which has given neutron research in these states its specific touch, and a competitive edge in the international contest. The present proposal is on one hand in the tradition of this approach, on the other hand, from collaboration with experimental groups from the INTAS member states, and their input of detector and computer technology, synergetic effects are to be expected.
The scientific background of the proposal is the search for a proper quantum mechanical formulation of the nuclear fission process. So far fission is largely treated in classical terms. But there are intriguing interference effects typical for quantum mechanics observed above all in fission induced by polarized neutrons and/or for targets with oriented nuclei. Some of these effects challenge fundamental symmetry laws, viz. space inversion and time reversal. The still unresolved mystery is how the delicate phase relations established between states in the compound nucleus following neutron capture manage to survive the violent fission process and to become detectable in experiment though the nucleus ends up in a huge number of final states. But also from an experimental point of view the situation is not satisfactory. For ultimate tests of theory more precise data are required. A new stimulus has come from the recent discovery of an unexpected correlation of outgoing particles with the spin of the neutron in ternary fission with three particles in the exit channel. At least formally this correlation violates time reversal invariance.
Four experimental and one theoretical team form the NIS states (PNPI Gatchina, JINR Dubna, IPPE Obninsk, KRI and Univ. of St. Petersburg) have reached an agreement with three experimental teams from the INTAS states (Univ. of Tuebingen, Univ. of Darmstadt and ILL Grenoble) to investigate one common project, viz. binary and ternary fission induced by slow neutrons with either the neutrons being polarized or the target nuclei being oriented. The ambitious experiments will be performed in various combinations of teams at three reactor sites: Dubna, Gatchina and Grenoble. Angular distributions and correlations of fission fragments, P-even and P-odd, will be studied as a function of incoming neutron energy in the resonance region. Special emphasis is put on the detailed investigation of the newly discovered T-odd correlation in ternary fission, its interconnection with P-odd and left-right asymmetries, its dependence on fragment and ternary particle masses and energies. A key feature of the project is that it will be carried through from the outset and during all stages of experimental progress in close contact with the theoretical team.
An INTAS grant is precisely the ideal framework for this type of joint venture.
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Programme(s)
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Coordinator
72076 Tübingen
Germany
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