Eur. Phys. J. A 14, 225-238 (2002)
DOI: 10.1140/epja/i2001-10122-3

Irreducible pionic effects in nucleon-deuteron scattering below 20 MeV

L. Canton¹, W. Schadow² and J. Haidenbauer<sup>3

1</sup>  Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Via F. Marzolo 8, Padova I-35131, Italy
²  Dipartimento di Fisica dell'Università di Padova, Via F. Marzolo 8, Padova I-35131, Italy
³  Forschungszentrum Jülich, IKP, D-52425 Jülich, Germany

luciano.canton@pd.infn.it

(Received: 21 November 2001 / Revised version: 22 January 2002 Communicated by A. Molinari)

Abstract
The consequences of a recently introduced irreducible pionic effect in low-energy nucleon-deuteron scattering are analyzed. Differential cross-sections, nucleon (vector) and deuteron (vector and tensor) analyzing powers, and four different polarization transfer coefficients are considered. This 3 NF-like effect is generated by the pion exchange diagram in presence of a two-nucleon correlation and is partially cancelled by meson retardation contributions. Indications are provided that such type of effects are capable to selectively increase the vector (nucleon and deuteron) analyzing powers, while in the considered energy range they are almost negligible on the differential cross-sections. These indications, observed with different realistic nucleon-nucleon interactions, provide additional evidences that such 3 NF-like effects have indeed the potential for solving the puzzle of the vector analyzing powers. Smaller but non-negligible effects are observed for the other spin observables. In some cases, we find that the modifications introduced by such pionic effects on these spin observables (other than the vector analyzing powers) are significant and interesting and could be observed by experiments.

PACS
24.70.+s - Polarization phenomena in reactions.
21.30.Cb - Nuclear forces in vacuum.
25.10.+s - Nuclear reactions involving few-nucleon systems.
25.40.Dn - Elastic neutron scattering.

© Società Italiana di Fisica, Springer-Verlag 2002