No abstract

Beta-delayed neutron emission from the precursors 93-1~176 to excited states in the residual nuclei 92-998r has been measured by means of 7-ray and neutron spectroscopy. In general, considerable neutron feeding of excited final states is observed. The experimental branching ratios (P,~) are compared to predictions from statistical model calculations. It is demonstrated that the main parameter affecting the Pj-values is the shape of the/3-strength function (Sp). For several Rb isotopes hindrance, respectively enhancement of neutron branches to specific final states is observed giving evidence for the persistence of intermediate structure of the neutron-emitting states. By the example of 98Rb it is shown that a few integral /3-delayed neutron properties may be sufficient to derive first estimates on the real shape of Se above the neutron binding energy. This result is of importance for exotic nuclei where detailed spectroscopic investigations are precluded.

No abstract

An intrinsic germanium detector was used to measure the beta endpoint energies of heavy fission products supplied by the on line mass separator OSTIS installed at the high flux reactor of the Institut Max von Laue-Paul Langevin, Grenoble. The endpoints of singles-spectra have been determined and, by means of beta-gamma coincidence measurements also most of the Ot~-values of the following neutron-rich nuclides could be deduced with high accuracy:

No abstract