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We present results for the three-cluster breakup in deuteron-deuteroncollisions at 130 and 270 MeV deuteron beam energy. The breakup amplitude iscalculated using the first term in the Neumann series expansion of thecorresponding exact four-nucleon equations. In analogy with nucleon-deuteronbreakup where an equivalent approximation is compared with exact calculations,we expect this single-scattering approximation to provide a rough estimation ofthree-body breakup observables in quasifree configurations. We predict thenucleon-deuteron and deuteron-deuteron three-cluster breakup cross sections tobe of a comparable size and thereby question the reliability of the recentexperimental data [A. Ramazani-Moghaddam-Arani, Ph.D. thesis, University ofGroningen, 2009; A. Ramazani-Moghaddam-Arani et al., EPJ Web of Conferences 3,04012 (2010)] that is smaller by about three orders of magnitude. We also showthat an equivalent single-scattering approximation provides a reasonabledescription of deuteron-deuteron elastic scattering at forward scatteringangles.

Three-cluster breakup in deuteron-deuteron collisions: single-scattering approximation