Investigation of the quasi-free domain in deuteron-deuteron break-up using spin observables

Abstract

Precision measurements of vector and tensor analyzing powers of the 2 H(d, dp)n break-up process for configurations in the vicinity of the quasi-free scattering regime with the neutron as spectator, are presented. These measurements are performed with a polarized deuteron-beam with an energy of 65 MeV/nucleon impinging on a liquid-deuterium target. The experiment was conducted at the AGOR facility at KVI using the BINA 4π-detection system. Events for which the final-state deuteron and proton are coplanar have been analyzed and the data have been sorted for various momenta of the missing neutron. In the limit of vanishing neutron momentum and at large deuteron-proton momentum transfer, the data agree well with the measured and theoretically predicted spin observables of the elastic deuteronproton scattering process. The agreement deteriorates rapidly with increasing neutron momentum and/or decreasing momentum transfer from the deuteron beam to the outgoing proton. This study reveals the presence of a significant contribution of final-state interactions even at very small neutron momenta.

Quasi-free limit in the deuteron-deuteron three-body break-up process

“…4 of Ref. [37]. The regions where the reconstructed momentum distribution of the missing neutron matches well with the expected momentum distribution of the neutron inside the deuteron are labeled as the quasi-free regions.…”

“…Via a dedicated analysis of vector and tensor analyzing powers of the 2 H( d, d p)n break-up reaction [37], we are interested in identifying the quasi-free domain with the neutron as the spectator in the 2 H( d, d p)n spec reaction. To proceed, the reconstructed momentum distribution of the missing neutron for different intervals of the Mandelstam variable, u, is compared with the expected momentum distribution of the nucleon derived from the wave function of the deuteron; see Fig.…”

“…The regions where the reconstructed momentum distribution of the missing neutron matches well with the expected momentum distribution of the neutron inside the deuteron are labeled as the quasi-free regions. A detailed discussion on the quasi-free domain can be found in [37]. Figure 2 depicts the results of analyzing powers as a function of S for four coplanar configurations including data corresponding to the QF region.…”

Report on scipost_202003_00051v1

“…Via a dedicated analysis of vector and tensor analyzing powers of the 2 H( d, d p)n break-up reaction [37], we are interested in identifying the quasi-free domain with the neutron as the spectator in the 2 H( d, d p)n spec reaction. To proceed, the reconstructed momentum distribu-tion of the missing neutron for different intervals of the Mandelstam variable, u, is compared with the expected momentum distribution of the nucleon derived from the wave function of the deuteron; see Fig.…”

Measurement of spin observables in three-body break-up in deuteron-deuteron scattering at 130 MeV

“…This chapter presents the results of an investigation which has been published in European Journal of Physics A [89]. The inclusion of this paper in the present thesis is done with the permission of the co-authors and the publisher.…”