Polarization observables in (${\vec γ},{\vec N}N$) reactions

Details Polarization observables in (${\vec γ},{\vec N}N$) reactions Polarization observables in (${\vec γ},{\vec N}N$) reactions

2001-02-15

arxiv.org/abs/nucl-th/0102036v2

Eur.Phys.J. A12 (2001) 69-85

Physics

Nuclear Physics

Nuclear Theory

27 pages, 16 figures (eps). Revised version. To be published in EPJA

Scientific paper

10.1007/s100500170040

The formalism of (${\vec \gamma},{\vec N}N$) reactions is given where the incident photon is polarized and the outgoing nucleon polarization is detected. Sixteen structure functions and fifteen polarization observables are found in the general case, while only eight structure functions and seven polarizations observables survive in coplanar kinematics. Numerical examples are presented for the $^{16}$O($\gamma,pn$) and $^{16}$O($\gamma,pp$) reactions. The transitions to the ground state of $^{14}$C and $^{14}$N are calculated in a model where realistic short-range and tensor correlations are taken into account for the $pn$ pair, while short-range and long-range correlations are included in a consistent way for $pp$ pairs. The effects of the one-body and two-body components of the nuclear current and the role of correlations in cross sections and polarizations are studied and discussed.

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