O. Wilhelm's research while affiliated with University of Tuebingen and other places
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Publications (4)
The experimental results for the (π+,π-)
reaction on nuclei obtained in recent years reveal clear systematic
features of this reaction. New data on 7Li, 12C,
16O, and 56Fe supplementing the existing data base
are presented. The data on 12C are partly at variance with
previous results. The dependence of the cross sections on incident
energy, scatter...
The reaction Nb-93(pi(+),pi(-))Te-93 has been measured in the energy range T-pi = 30-60 MeV at various scattering angles. At all energies the groundstate transition could be observed, whereas the transition to the double isobaric analog state has been identified unambiguously only at T-pi = 50 MeV. The groundstate transition exhibits a pronounced r...
The reaction 93Nb(π+,π−)93Te has been measured in the energy range Tπ=30–60 MeV at various scattering angles. At all energies the groundstate transition could be observed, whereas the transition to the double isobaric analog state has been identified unambiguously only at Tπ=50 MeV. The groundstate transition exhibits a pronounced resonance-like en...
The (π+,π-) reaction on the isoscalar, doubly magic nuclei 16O and 40Ca has been measured in the energy range Tπ = 45–90MeV. The forward angle cross sections of the ground state transitions (GST) show a very pronounced resonancelike energy dependence. The observed energy and angle dependences are well described by the recent hypothesis of the forma...
Citations
... An even more exciting feature of non-analog transitions has been revealed by subsequent measurements [218,219,220,221,222,223,224] at low energies. There these transitions exhibit in general not only larger cross sections than at higher energies, but also a very pronounced narrow resonant structure in the energy dependence (Fig. 4), which we will discuss in detail in the following. ...
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... The present work fills a gap between these previous studies by measuring correlations in the 2p ground-state (g.s.) decay of the sd-shell nucleus 16 Ne where the Coulombic effects appear to be strong enough to be observable. Known experimentally for several decades [16], 16 Ne has remained poorly investigated with just a few experimental studies [17][18][19][20]. However, interest has returned recently with the decay of 16 Ne measured in relativistic neutron-knockout reactions from a 17 Ne beam [21,22]. ...
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