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HK: Hadronen und Kerne
HK 64: Elektromagnetisch wechselwirkende Sonden VII
HK 64.3: Talk
Thursday, March 27, 1997, 17:45–18:00, HS G
Deuteron electrodisintegration near threshold in the Bethe-Salpeter approach — •M. Beyer1, S.G. Bondarenko2, V.V. Burov2, and S.M. Dorkin3 — 1FB Physik, Rostock University, Germany — 2Bogoliubov Laboratory of Theoretical Physics, JINR Dubna, Russia — 3Far Eastern State University Vladivostok, Russia.
In the framework of the covariant Bethe–Salpeter
formalism we investigate the electrodisintegration of the deuteron near the
threshold energy. Due to a 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. Then relativistic covariance requires only one
electromagnetic transition form factor for this amplitude and this
leads to substantial simplifications for the polarization observables
and allows to make conclusions independent on the details of the
interaction. 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 are discussed.
supported by Max Planck Gesellschaft zur Förderung
der Wissenschaften and DFG-RFFI program.