3 research outputs found
Parity-Violating Electron-Deuteron Scattering
The longitudinal asymmetry due to exchange is calculated in
quasi-elastic electron-deuteron scattering at momentum transfers GeV relevant for the SAMPLE experiment. The deuteron and
scattering-state wave functions are obtained from solutions of a Schr\"odinger
equation with the Argonne potential. Electromagnetic and weak neutral
one- and two-nucleon currents are included in the calculation. The two-nucleon
currents of pion range are shown to be identical to those derived in Chiral
Perturbation Theory. The results indicate that two-body contributions to the
asymmetry are small ( 0.2%) around the quasi-elastic peak, but become
relatively more significant ( 3%) in the high-energy wing of the
quasi-elastic peak.Comment: 23 pages, 10 figure
Weak axial nuclear heavy meson exchange currents and interactions of solar neutrinos with deuterons
Starting from the axial heavy meson exchange currents, constructed earlier in
conjunction with the Bethe--Salpeter equation, we first present the axial
--, -- and meson exchange Feynman amplitudes that satisfy
the partial conservation of the axial current. Employing these amplitudes, we
derive the corresponding weak axial heavy meson exchange currents in the
leading order in the 1/M expansion ( is the nucleon mass), suitable for the
nuclear physics calculations beyond the threshold energies and with wave
functions obtained by solving the Schr\"odinger equation with one--boson
exchange potentials. The constructed currents obey the nuclear form of the
partial conservation of the axial current. We apply the space component of
these currents in calculations of the cross sections for the disintegration of
deuterons by low energy (anti)neutrinos. The deuteron and the final state
nucleon--nucleon wave functions are derived (i) from a variant of the OBEPQB
potential, and (ii) from the Nijmegen 93 and Nijmegen I nucleon-nucleon
interaction. The extracted values of the constant , entering the
axial exchange currents of the pionless effective field theory, are in a
reasonable agreement with its value predicted by the dimensional analysis.Comment: 34 pages, 3 figures, 11 table