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S. Hachem

Publications and source records attributed to S. Hachem.

5 recordsLinked to original sources
arXiv2012

On transfer reactions playing a role in fission and in heavy-ion physics

The cross section curves for the formation, at the barrier, of trans-target isotopes of a heavy element by bombardment of a heavy target with various heavy ions are shown to be similar to the distribution of the neutron number N of a fission fragment around its most probable value . Moreover the isotopic cross sections for one-, two- and three- proton transfer products are found to be in agreement with the Gaussian distribution law of the atomic number Z of a fission product around its most probable value . This situation suggests that the law of transfer of nucleons could be the same in fission and in particular heavy-ion reactions, and that the transfer time could be the same, i.e. of the order of 0.17 yoctosecond.

nucl-ex↗
arXiv2011

On the origin of high- spin states in nuclear fission fragments

In the "nucleon-phase" model of binary fission, the transfer of nucleons between an A =126 « nucleon core » and the primordial "cluster" can explain both the formation of high- spin states and the saw-tooth behavior of the variation, as a function of fragment mass, of the average angular momentum.

nucl-ex↗
arXiv2011

Fission involves a new state of nuclear matter

The rearrangement step of nuclear fission occurs within 0.17 yoctosecond, in a new state of nuclear matter characterized by the formation of closed shells of nucleons. The determination of its lifetime is now based on the prompt neutron emission law. The width of isotopic distributions measures the uncertainty in the neutron number of the fragments. Magic mass numbers, 82 and 126, play a major role in the mass distributions. Arguments are presented in favour of an all-neutron state. The boson field responsible for the new collective interaction has to be searched for.

nucl-ex↗