The low energy 2H(α, αp)n reaction

doi:10.1016/0375-9474(82)90113-0

Nuclear Physics A

Volume 386, Issue 2, 27 September 1982, Pages 269-286

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Abstract

An investigation of the breakup reaction ²H(α, αp)n with incident energies of α-particles between 9.847 and 13.991 MeV has been performed. Results from kinematically complete measurements at 21 different kinematical configurations are presented. Final-state interaction enhancements have been experimentally observed. The energy is sufficiently low that the A = 6 system should be reasonably well described as a three-body system. The experimental data were compared with predictions based on Faddeev equations. Taking into account that no adjustable parameter is used, the quality of agreement is in general acceptable.

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Detailed study of the cluster structure of light nuclei in a three-body model. (III). Electromagnetic structure of 6Li
1990, Nuclear Physics, Section A
The multicluster dynamic model with the Pauli projection (MDMP) for treating light nuclei, developed earlier, is used to study in detail the ⁶Li electromagnetic structure including all the measured elastic and inelastic, transverse and longitudinal, isoscalar and isovector electromagnetic form factors of the nucleus and to make some predictions concerning other, not yet measured, form factors. The model is also used to calculate all the measured radiation widths Γ_γO of the excited ⁶Li^* states. A proper description has been obtained for most of the known electromagnetic form factors of the nucleus. The reasons for disagreement with experimental data in the case of large momentum transfers in the M1 form factors, both elastic and inelastic, are discussed. The elastic CO form factor of ⁶Li and, probably, of other light nuclei in the region of the secondary maximum is shown to be defined, to a very great extent, by the behaviour of the α-particle charge form factor in the region of its secondary maximum. The radiation widths of the 3⁺0, 2⁺0, and 1⁺0 levels have been found to be highly sensitive to minor impurities of the wavefunction components with higher orbital moments for the excited states, as well as the ground state, of ⁶Li. The Siegert theorem is shown to be of great importance when studying the probabilities of transverse electromagnetic transitions. The copious results obtained by the present authors, as well as elsewhere, concerning the diverse aspects of the behaviour of six-nucleon system in the strong, weak, and electromagnetic processes are used to formulate the concept of using the given system as an extremely convenient theoretical laboratory in nuclear physics. The relevant proposals concerning future experiments are formulated.
Energy and angle dependence of the vector analyzing power and cross section of the 4He(d, pα)n reaction in a kinematically-complete measurement between 6 and 11 MeV
1985, Nuclear Physics, Section A
Differential cross sections and vector analyzing powers of the breakup reaction $^{4} He (d, p α) n$ have been measured in a kinematically-complete coincidence experiment as a function of the bombarding energy from 6 to 11 MeV and for production angles θ from 40° to 90° at a fixed bombarding energy of 7 MeV. The excitation function was taken at a fixed proton c.m. angle theta;_p.c.m. = 69° corresponding to the kinematical conditions of nα final-state interaction. The comparison with a Faddeev calculation shows good agreement at the higher energies but serious deviations in the region of the 1⁺ (5.65 MeV) state of ⁶Li but only in the cross section. It is suggested that this is probably due to the effects of the Coulomb interaction.
An approximate treatment of Coulomb effects in a three-body model of the d(α, (αp)n breakup reaction
1985, Physics Letters B
Nuclear few cluster studies
1984, Nuclear Physics, Section A
Two topics from the wide field of nuclear few cluster studies are reviewed in this talk. They were chosen after a search revealed their prevalence in the literature from 1979–1983.
Recent developments in the experimental and theoretical study of the six-nucleon system are discussed first. It is concluded that sufficiently comprehensive data sets are available to test the various theoretical models, which all show distinct deficiencies and must be improved. It is recommended that new experiments should only be carried out if the resolution of a specific, well-defined problem is attempted.
The larger part of the talk is devoted to a critical review of the “molecular” (two-body) aspects of the interaction between lighter heavy ions (in particular ¹²C + ¹²C). Such fewbody aspects of HI collisions have never before been discussed at a Few Body Conference. An attempt is made to define the present status of the “molecular state” concept and to suggest directions for further, more conclusive experimental studies, based on well-tested methods used in few-body nuclear physics.
Indirect particle identification by time-of-flight difference in particle coincidence experiments
1986, Nuclear Inst. and Methods in Physics Research, A
Kinematically complete coincidence experiments in direct three particle reactions favour a list-mode technique for the measurement with a structured event-by-event data processing. We present the principles of a method for particle discrimination and projection onto the kinematically allowed curve without the use of telescopes. The particle discrimination technique works even with dc-beam accelerators. It uses only the information about the energies and about the difference of time-of-flight of the two particles measured in coincidence.
Kinematically complete measurement of cross sections and vector and tensor analyzing powers of 4He(d, pα)n at E<inf>d</inf> = 10 MeV
1983, Nuclear Physics, Section A
Differential cross sections and vector and tensor analyzing powers have been measured in the breakup reaction ⁴He( $d$ , pα)n at $E_{d} = 10 MeV$ , for θ_α = 46°, θ_p = 46° complete coincidence experiment. The kinematics allow for np final-state interaction (FSI) (E_np = 0). A comparison with theoretical predictions based on Faddeev equations is presented.
Phenomenologically it appears that there are large interference effects between the different FSI and the importance of Coulomb interaction emerges clearly.

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Nuclear Physics A

Abstract

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Cited by (16)

Detailed study of the cluster structure of light nuclei in a three-body model. (III). Electromagnetic structure of <sup>6</sup>Li

Energy and angle dependence of the vector analyzing power and cross section of the <sup>4</sup>He(d, pα)n reaction in a kinematically-complete measurement between 6 and 11 MeV

An approximate treatment of Coulomb effects in a three-body model of the d(α, (αp)n breakup reaction

Nuclear few cluster studies

Indirect particle identification by time-of-flight difference in particle coincidence experiments

Kinematically complete measurement of cross sections and vector and tensor analyzing powers of <sup>4</sup>He(d, pα)n at E<inf>d</inf> = 10 MeV