H. Brückmann

A versatile scattering set-up in use for many-particle correlation experiments at the Hamburg isochronous cyclotron Part I: Mechanical system

Abstract A very versatile system has been developed to meet most of the mechanical requirements for experimental set-ups in nuclear physics. The system components are also suitable for many other physical applications. One characteristic set-up is used to perform kinematically complete correlation experiments at the Hamburg Isochronous Cyclotron. Coplanar and non-coplanar geometry may be used to detect neutrons and charged particles in coincidence. A vacuum tank with sector shape makes the set-up equivalent to a scattering chamber of 2.4 m diameter in an angular range of 23.6°. This feature is used advantageously for scattering experiments at very small angles.

The tensor polarization of 5Li (32−) in the reaction α + d → α + p + n

Abstract At the Hamburger Isochronous Cyclotron the formation of the particle unstable ground state of 5 Li( 3 2 − has been investigated in the reaction α + d → α + p + n at E α = 28.3 MeV. The neutrons were detected in two liquid scintillation counters, while a large Si (Li) detector was used to observe the α -particles. In a first analysis, the tensor polarization parameters of the five-nucleon system 5 Li are determined from the experimental data. The results are in quite good agreement with theoretical predictions of Hackenbroich et al.

The tensor polarization of 5Li(3/2−) determined by angular correlation experiments in the reaction α+d→α+p+n

Angular correlation experiments in the reaction α+d→α+p+n have been performed at the Hamburg Isochronous Cyclotron. The tensor polarization of the particle unstable ground state of 5Li, which is formed as an intermediate state, has been determined from the experimental data. The tensor moments are compared with theoretical results calculated by Hackenbroich et al. in the frame of resonating group theory.

Angular correlation experiments in the reactions 2H(α, nα)p and 2H(α, pα)n and comparison with the Faddeev theory and the resonating group method☆

Abstract At the Hamburg Isochronous Cyclotron angular correlation experiments were carried out in the reactions 2 H(α, nα)p and 2 H(α, pα)n, in order to determine the tensor polarization of the ground-state resonances 5 Li ( 3 2 − ) and 5 He ( 3 2 − ) , respectively. We find that the observables for the two mirror reactions 2 H (α, n ) 5 Li and 2 H (α, p ) 5 He are charge-dependent. This result is interpreted as evidence for a violation of charge symmetry. In the whole phase-space region absolute break-up cross sections are generally well reproduced by the Faddeev theory. On the other hand, we find that the resonating group method which has up to now been mainly applied to two-body reactions can also provide valuable information for break-up reactions. The predictions of Hackenbroich, Schutte and coworkers are in quite good agreement with the measured tensor polarization of 5 He and 5 Li and the corresponding angular correlation functions.