arXiv subjects

A. V. Lado

Publications and source records attributed to A. V. Lado.

2 recordsLinked to original sources

arXiv1998

Backward Elastic p3He Scattering at Energies 1 - 2 GeV

The two-body transfer amplitude for the rearrangement process i+(jkl) - j+(ikl) is constructed on the basis of technique of 4-dimensional covariant nonrelativistic graphs. The developed formalism is applied to describing backward elastic $p^3He$ scattering in the energy range 0.5 - 1.7 GeV. Numerical calculations performed using the 5- channel wave function of the $^3He$ nucleus show that the transfer of a noninteracting np- pair dominates and explains satisfactorily the energy and angular dependence of the differential cross section at energies 0.9 - 1.7$ GeV. A weak sensitivity to high momentum components of the $~^3He$ wave function in spite of large momentum transfer as well as a very important role of rescatterings in the initial and final states are established.

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arXiv1998

The $pd\to ^3H_ΛK^+$ reaction cross section

The one- and two-step mechanisms of the $pd\to ^3H_ΛK^+$ reaction in the range of incident proton kinetic energy 1.13-3.0 GeV have been investigated. A remarkable peculiarity of the two-step mechanism which incorporates subprocesses $pp\to dπ^+$ and $π^+n\to K^+Λ$ is the so called velocity matching providing the presence of all intermediate particles nearly to the on-mass-shell. The differential cross section has been calculated using a realistic model for the hypertritium $^3H_Λ$ wave function. The maximum value of the cross section is estimated as $\sim $1nb/sr. The contribution of the one-step mechanism with the elementary process $pN\to NKΛ$ into the cross section has been found to be two - three orders of magnitude smaller in comparison with the two-step mechanism.

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