Spectroscopy of few-particle nuclei around magic 132Sn from fission product γ-ray studies

We are studying the yrast structure of very neutron-rich nuclei around doubly magic 132Sn by analyzing fission product γ-ray data from a 248Cm source at Eurogam II. Yrast cascades in several few-valence-particle nuclei have been identified through γγ cross coincidences with their complementary fission partners. Results for two-valence-particle nuclei 132Sb, 134Te, 134Sb and 134Sn provide empirical nucleon-nucleon interactions which, combined with single-particle energies already known in the one-particle nuclei, are essential for shell-model analysis in this region. Findings for the N = 82 nuclei 134Te and 135I have now been extended to the four-proton nucleus 136Xe. Results for the two-neutron nucleus 134Sn and the N = 83 isotones 134Sb, 135Te and 135I open up the spectroscopy of nuclei in the northeast quadrant above 132Sn