Abstract
Publisher Summary This chapter examines the double spectator process in the 3He(3He,dd)pp reaction. Measurements of nuclear systems with three or four particles in the final state can be influenced by a number of processes: (1) quasifree scattering (QFS), (2) quasifree reactions (QFR), (3) final state interactions (FSI), (4) simultaneous breakup, which results in phase space distribution of events, and (5) second-order effects. The chapter describes an investigation on the four-body continuum for the reaction 3He(3He,dd)pp with two detector-telescopes in coincidence to determine whether the double quasifree scattering (DQFS) process is observable. The 3He(2H,dd)p and 2H(3He,dd)p reactions were also measured for DQFS-equivalent d–d center of momentum conditions with proton spectators in the target and projectile, respectively. The results obtained suggest that the DQFS process is observable, and the comparison of the data to PWIA predictions indicate that 3He has a reasonably strong p + d cluster configuration and that a PWIA analysis is as appropriate for DQFS processes as it is for QFS processes.
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