Elsevier

Nuclear Physics A

Volume 442, Issue 4, 16 September 1985, Pages 701-720
Nuclear Physics A

Theoretical investigation of parity violation in pα scattering

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Abstract

Calculations are presented of the parity-non-conserving (PNC) analyzing power Az for longitudinally polarized incoming protons in elastic pα scattering below ∼50 MeV. The results are given in terms of the PNC as well as the regular, parity-conserving (PC) meson-nucleon coupling constants for single π-, ρ- and ω-exchange. The reliability and parameter dependence of the calculations are discussed in detail. The PC on-shell scattering parameters play an important role in particular for the angular dependence of Az, which must be known for the actual analysis of measurements and are taken from experiments directly (phase analysis) rather than model calculations. The PNC scattering amplitudes are calculated in DWBA with optical-model wave functions properly antisymmetrized. Short-range correlations between nucleon pairs are taken into account by a Jastrow factor whose appropriate choice is discussed in detail. While absorption from the elastic channel is taken into account by the optical-model wave function, intermediate breakup channels are not included explicitly in the matrix elements.

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    Present address: Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109, USA.

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