Decay Studies of the Highly Neutron-deficient Indium Isotopes PDF Download

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Book Description
An extension of the experimentally known nuclidic mass surface to nuclei far from the region of beta-stability is of fundamental interest in providing a better determination of the input parameters for the various nuclear mass formulae, allowing a more accurate prediction of the ultimate limits of nuclear stability. In addition, a study of the shape of the mass surface in the vicinity of the doubly-closed nuclide 1°°Sn provides initial information on the behavior of the shell closure to be expected when Z = N = 50. Experiments measuring the decay energies of 1°3 1°5In by .beta.-endpoint measurements are described with special attention focused on the development of a plastic scintillator .beta.-telescope coupled to the on-line mass separator RAMA (Recoil Atom Mass Analyzer). An attempt to measure the .beta.-endpoint energy of 1°2In is also briefly described. The experimentally determined decay energies and derived masses for 1°3 1°5In are compared with the predictions of different mass models to identify which models are more successful in this region. Furthermore, the inclusion in these comparisons of the available data on the neutron-rich indium nuclei permits a systematic study of their ground state mass behavior as a function of the neutron number between the shell closures at N = 50 and N = 82. These analyses indicate that the binding energy of 1°3In is 1 MeV larger than predicted by the majority of the mass models. An examination of the Q/sub EC/ surface and the single- and two-neutron separation energies in the vicinity of 1°3 1°5In is also performed to investigate further the deviation and other possible systematic variations in the mass surface in a model-independent way.