Results 1 - 10 of 19718
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[en] Neutron separation energies in 91Zr, 92Zr and 95Zr were determined by measurements of relative Q-values for (d,p) reactions on Zr isotopes. A comparison is made with separation energies derived from a previous measurement of (d,t) reaction Q-values. The neutron separation energy in 95Zr disagrees by three standard deviations with the adjusted value in the 1977 Atomic Mass Evaluation. (orig.)
[en] The volume and surface effects in the nuclear local energy density and the volume and surface components of the pairing interaction are discussed in the context of the mean-field, Hartree-Fock-Bogolyubov description of atomic nuclei. Predictions of properties of exotic nuclei close to the particle drip lines are presented. (orig.)
[en] We explore the systematics of odd-even mass staggering with a view to identifying the physical mechanisms responsible. The BCS pairing and mean-field contributions have A- and number parity dependences which can help disentangle the different contributions. This motivates the two-term parametrization c1+c2/A as a theoretically based alternative to the inverse-power form traditionally used to fit odd-even mass differences. Assuming that the A -dependence of the BCS pairing is weak, we find that mean-field contributions are dominant below mass number A∝40 while BCS pairing dominates in heavier nuclei. (orig.)
[en] Empirical correlations in isotopic differentials of charge radii have been combined with the differentials for data on the energy of the first excited 2+ state, on R4/2=E(4+1)/E(2+1), on the transition rate from the 2+1 to the ground state and the two neutron separation energies. These differential results exhibit remarkable consistency with each other although, individually, structure and/or mass observables reveal different patterns. In the past, there are number of valuable studies of isotope shifts comparable to different observables but not the direct correlations as will be presented here. We show that a single general pattern occurs for five different observables for each mass region. This helps one to follow the structural changes more easily by looking at one type of pattern. This study may be a guide for both experimental studies, future measurements in charge radii, masses, spectroscopic observables, and theoretical studies.
[en] The ground-state properties of superheavy nuclei are investigated within various parametrisations of relativistic and nonrelativistic nuclear mean-field models. The heaviest known even-even nuclei starting with Z=98 are used as a benchmark to estimate the predictive power of the models and forces. From that starting point, deformed doubly magic nuclei are searched in the region 100≤Z≤130 and 142≤N≤190. (orig.)