https://doi.org/10.1140/epja/i2007-10418-2
Regular Article - Nuclear Structure and Reactions
Electromagnetic proton-neutron knockout off 16O : New achievements in theory
1
Dipartimento di Fisica Nucleare e Teorica, Università degli Studi di Pavia, and Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, I-27100, Pavia, Italy
2
Dipartimento di Fisica, Università degli Studi di Trento, and Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Trento, I-38100, Povo (Trento), Italy
3
European Center for Theoretical Studies in Nuclear Physics and Related Areas, I-38100, Villazzano (Trento), Italy
* e-mail: Carlotta.Giusti@pv.infn.it
Received:
5
June
2007
Accepted:
28
June
2007
Published online:
31
July
2007
Results for the cross-sections of the exclusive 16O(e, e'pn)14N and 16O(γ, pn)14N knockout reactions are presented and discussed in different kinematics. In comparison with earlier work, a complete treatment of the center-of-mass (CM) effects in the nuclear one-body current is considered in connection with the problem of the lack of orthogonality between initial bound and final scattering states. The effects due to CM and orthogonalization are investigated in combination with different treatments of correlations in the two-nucleon overlap function and for different parametrizations of the two-body currents. The CM effects lead in super-parallel kinematics to a dramatic increase of the 16O(e, e'pn) cross-section to the 12 + excited state (3.95MeV) of 14N . In all the situations considered the results are very sensitive to the treatment of correlations. A crucial role is played by tensor correlations, but also the contribution of long-range correlations is important.
PACS: 21.60.-n Nuclear structure models and methods – / 25.20.Lj Photoproduction reactions – / 25.30.Fj Inelastic electron scattering to continuum –
© Società Italiana di Fisica and Springer-Verlag, 2007