W. J. Naude
Stellenbosch University
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Featured researches published by W. J. Naude.
Nuclear Physics | 1976
A.A. Pilt; D.J. Millener; H.S. Bradlow; O. Dietzsch; P.S. Fisher; W. J. Naude; W.D.M. Rae; D. Sinclair
Abstract It is suggested that states in 19 F at 8.97, 12.26 and 12.67 MeV, observed to be strongly excited in the 15 N( 13 C, 9 Be) 19 F reaction at 105 MeV, have J π = 11 2 − , 17 2 − and 15 2 − . The observed spectrum and cross sections are compared with the results of an SU(3) shell-model calculation of 4p-1h states in 19 F, and good overall agreement is obtained. The 17 2 − level should belong to the lowest K π = 1 2 − band. The problem of identifying the J π = 11 2 − member of this band is discussed. Consideration of γ-ray decay, triton transfer and α-transfer data leads to the conclusion that the 8.97 and 12.67 MeV levels most likely have a dominant 16 O plus triton cluster configuration with a 2 N + L = 7 relative motion node structure. The lowest levels of this second K π = 1 2 − band are identified with the 6.08 MeV ( 3 2 − ) and 6.93 MeV ( 7 2 − ) levels. Selective excitation of states in 20 Ne is also observed in the reaction 16 O( 13 C, 9 Be) 20 Ne at 105 MeV. Of particular interest is the conclusion that when kinematic effects are taken into account (via semi-classical reaction theory) the amplitudes for exciting each member of the groundstate band are approximately equal at this energy. This result accords with the predictions of the shell model for α-particle cluster transfer and is contrary to the conclusions drawn from earlier work. Finally, a comparison of cross sections to the 19 F and 20 Ne excited states suggests that there is little evidence for an increase in α-clustering in 19 F relative to 20 Ne.
Nuclear Physics | 1974
N. J. A. Rust; W. J. Naude; J. W. Koen; W.L. Mouton
Abstract The spins and electromagnetic properties of levels up to 1800 keV in 45Sc were studied by means of inelastic proton scattering. Results are discussed with reference to the excited-core model.
Zeitschrift f�r Physik A Atoms and Nuclei | 1983
W. J. Naude; H. S. Bradlow; O. Dietzsch; A. A. Pilt; W. D. M. Rae; D. Sinclair
Elastic scattering of20Ne on24Mg was studied at an incident20Ne energy of 40 MeV. Scattered20Ne and24Mg nuclei were observed in coincidence with a standard surface barrier and a position sensitive detector. The measured angular distribution shows periodic oscillations which are identified with the24Mg(20Ne,24Mg)20Ne reaction. Taking interference between elastic scattering and transfer into account, anα-spectroscopic factor ofS=0.08±0.02 was deduced from the amplitude of the oscillations.
European Physical Journal A | 1980
J. J. Buitendag; W. J. Naude; R. Saayman; N. J. A. Rust; J. W. Koen
The spins and electromagnetic properties of levels in45Sc up to 2,352 keV were studied by means of inelastic proton scattering using a 3-parameter coincidence arrangement and Coulomb excitation with3He and4He beams. Relevant experimental results are discussed in terms of the Thankappen-True core-plus-particle model.
European Physical Journal A | 1980
P. Haupt; J. W. Koen; W. J. Naude; N. J. A. Rust
Levels up to 3,016 keV in59Co were studied using the59Co (p, p′y) and56Fe (α, py) reactions. Level energies, branching ratios, mean lifetimes and spins were obtained for a number of levels.
European Physical Journal A | 1980
J.C. Van der Merwe; W. J. Naude; R. Saayman; J. W. Koen; N. J. A. Rust
The spins and electromagnetic properties of levels up to 3,700 keV in51V were studied by means of inelastic proton scattering. Results are discussed with reference to the many-particle shell model using effective surface delta and realistic Kuo-Brown interactions.
European Physical Journal A | 1987
S. Froneman; W. J. Naude; W. A. Richter; J. A. Stander; J. W. Koen
Properties of levels up to 3.5 MeV in43Sc were studied using40Ca (α, p)43Sc and40Ca(α, pγ)43Sc reactions atEα=12 MeV. Level energies, branching ratios, mean lifetimes, spins and mixing ratios were obtained for a number of levels. Relevant results are compared with many-particle shell-model predictions.
European Physical Journal A | 1986
J. A. Stander; W. J. Naude; R. Saayman; N. J. A. Rust
The spins and electromagnetic properties of low-lying levels in39K with excitation energy ≦4.127 MeV were studied with the39K(p, p′γ)39K and the36Ar(α, pγ)39K reactions. Experimental results are discussed in terms of shell model calculations with a modified effective surface delta interaction.
European Physical Journal A | 1986
J. A. Stander; W. J. Naude; R. Saayman; J. W. Koen
The atomic nucleus41K was studied with emphysis on the experimental derivation of electromagnetic properties and spin values of low-lying levels with energies ≦3,282 keV. Energy levels, decay properties and mean lifetimes were measured with (p, p′ γ) and (p, p′) reactions at incident proton energies of about 6 MeV. Spin values were deduced from a comparison of results obtained from a Hauser-Feshbach analysis of (p, p′) and (p, p′ γ) reactions and measured transition strengths derived from mixing ratios, lifetimes and decay properties. Experimental results are discussed in terms of shell model calculations with a modified effective surface delta interaction.
European Physical Journal A | 1986
J. J. Lawrie; W. J. Naude; J. A. Stander; J. W. Koen; N. J. A. Rust
Properties of levels up to 5 MeV excitation in37Cl were studied with37Cl(p, p′ γ)37Cl,37Cl(α, α′ γ)37Cl and34S(α, pγ)37Cl reactions. Results are discussed with reference to the many-particle shell model with an effective surface delta interaction.
