Low Energy Pair Breaking Mechanism

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Electron Pair Production, Neutron-Neutron Interactions, Nuclear Fragmentation, Internal Pair Production, Neutron-Induced Fission, Projectile And Target Fragmentation

Scientific paper

A new set of time dependent coupled channel equations for pair breaking are deduced from the variational principle. The odd-even effect in fission is investigated within the model. The essential idea is that the seniority one and the seniority two configuration mixing is managed under the action of some inherent low lying time dependent excitations produced in the avoided crossing regions. It must be mentioned that the odd-even effect in cold fission is a strange phenomenon. The odd even fragmentation dominates at very low excitation energy while the even-even partitions are dominant for excitations above 4-6 MeV. The problem is that in cold processes the nuclear system doesn't possess enough energy to break a pair. This phenomenon is explained within our equations.

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