arXiv subjects

S. M. Dorkin

Publications and source records attributed to S. M. Dorkin.

23 records · Page 2Linked to original sources

arXiv1997

Deuteron electrodisintegration near threshold in the Bethe-Salpeter approach

In the framework of the covariant Bethe-Salpeter formalism we calculate the amplitude of electrodisintegration of the deuteron near the threshold energy. Due to the small relative momentum of the final np-pair, the deuteron break-up process may be sufficiently described by a transition to the dominant 1S0 channel into the final state. Therefore only one unknown structure function (form factor) exists. The explicit formula for this form factor is given in terms of partial Bethe-Salpeter amplitudes. We compare our result to the usual non-relativistic calculations. The essential role of P-states as well as their possible link to mesonic exchange currents is discussed.

nucl-th↗

arXiv1996

Relativistic Description of Exclusive Deuteron Breakup Reactions

The exclusive deuteron break-up reaction is analyzed within a covariant approach based on the Bethe-Salpeter equation with realistic meson-exchange interaction. Relativistic effects in the cross section, tensor analyzing power and polarization transfer are investigated in explicit form. Results of numerical calculations are presented for kinematical conditions in forthcoming p + D reactions at COSY.

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arXiv1996

Can we learn anything new from polarization observables of the deuteron disintegration near threshold?

We discuss polarization characteristics of the deuteron disintegration near the threshold energy. Due to the small relative energy of the outgoing $np$ pair, the dominant amplitude for this process is a 1+ -> 0^+ transition. Relativistic covariance requires only one electromagnetic transition form factor for this amplitude. Subsequently this leads to substantial simplifications in the formulas of the polarization observables and allows to draw conclusions independent of the details of the interaction.

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arXiv1996

Magnetic moment of the deuteron as probe of relativistic corrections

The calculation of the magnetic moment of the deuteron in the framework of the Bethe--Salpeter approach is performed. The relativistic corrections are calculated analytically and estimated numerically. It is shown that the main contributions are due to partial waves with positive energies and $P$--waves. A comparison with the non-relativistic schemes of calculations including mesonic exchange currents is made.

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arXiv1993

Hadron and Quark Form Factors in the Relativistic Harmonic Oscillator Model

Nucleon, pion and quark form factors are studied within the relativistic harmonic oscillator model including the quark spin. It is shown that the nucleon charge, magnetic and axial form factors and the pion charge form factor can be explained with one oscillator parameter if one accounts for the scaling rule and the size of the constituent quarks.

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