On the origin of the flow angle in high-energy collisions of heavy nuclei

We expose a “test” participant nucleon to the moving projectile and target spectator nuclear mean fields. A net attraction of the participant is found which results in a sizeable flow angle in collisions of heavy nuclei at an incident energy of 400 MeV/nucleon.     

Excitation during collective deformation: How simple it is

In the frame of the time dependent Hartree-Fock-Bogolyubov method a simple model for the excitation of a nucleus during a collective deformation is presented. The Hilbert space consists of all single and multiple pair excitations the nucleons of each pair being in time reversed states. The non-adiabatic transitions within this space are treated correctly. Treating the selfconsistency ofλ andΔ only in an average way reduces the multichannel calculation to a set of Landau-Zener problems. These give the excitation probability of each pair. Introducing average quantities yields an analytic solution for the excitation energy in the fission process, the collective kinetic energy at the scission point and the mean number of pair excitations for any deformation.     

Evidence for spin fluctuations in the deep-inelastic reaction 165Ho + 165Ho at 8.5 MeVamu

Both the magnitude and alignment of the transferred angular momentum in the reaction ¹⁶⁵Ho + ¹⁶⁵Ho have been measured as a function of Q-value via continuum γ-ray multiplicity and anisotropy techniques. The spin transfer and the continuum γ-ray anisotropy increase throughout the quasi-elastic region. The spin transfer as a function of Q-value saturates at ~ 35?/fragment, the anisotropy peaks at a value of ~2 and then decreases to near unity for the largest Q-values. The observed anisotropies are in good agreement with predictions from an equilibrium statistical model in which thermal excitation of angular-momentum-bearing collective modes and neutron evaporation give rise to in-plane components of the angular momentum.     

Ion exchange behaviour of polymeric zirconium cations

Summary Polymeric zirconium cations formed in weakly acid solution (pH2) are taken up strongly into macroporous cation exchange resins, while uptake into normal cation exchange resins (pore diameter about 1 nm) is low. Macroporous cation exchange resins loaded with polymeric Zr cations are shown to function as ligand exchange sorbents.

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Ionenaustauschverhalten polymerer Zirkonium-Kationen (Kurze Mitt.)

Zusammenfassung Polymere Zirkonium-Kationen, die in schwach sauren Lösungen (pH2) vorliegen, werden von makroporösen Kationenaustauschern stark aufgenommen, während bei den üblichen Kationenaustauschern (mit Porengrößen von etwa 1 nm) nur geringe Aufnahme stattfindet. Makroporöse Kationenaustauscher die mit polymeren Zr-Kationen beladen sind fungieren als Liganden-Austauschsorbentien.

     

Resonances of the NN̄ system within a field theoretical model

The bound resonance states of the NN? system are calculated on the basis of the OBE model for nuclear forces. The widths of these states are for the first time calculated microscopically in as much as the corresponding bloc diagrams for the decay in two bosons are treated explicitly. All parameters of the boson-nucleon coupling scheme were determined from a fitting of the OBEP to the experimental NN scattering phases. In contrast to former treatments (introduction of a phenomenological imaginary part of the potential) three narrow bound states (among a large number of very broad unobservable levels) were found with level widths smaller than 30 MeV. Levels of this kind were suggested by earlier experiments which, however, were not confirmed by later investigations.