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Publication

Spectroscopy of Element 115 Decay Chains

Publication Type
Journal
Journal Name
Physical Review Letters
Publication Date
Page Number
112502
Volume
111
Issue
11

A high-resolution a, X-ray and γ-ray coincidence spectroscopy experiment was conducted at the GSI Helmholtzzentrum fu ̈r Schwerionenforschung. Thirty correlated a-decay chains were detected following the fusion-evaporation reaction 48Ca + 243Am. The observations are consistent with previous assignments of similar decay chains to originate from element Z = 115. The data includes first candidates of fingerprinting the decay step Mt --> Bh with characteristic X rays. For the first time, precise spectroscopy allows the derivation of excitation schemes of isotopes along the decay chains starting with elements Z > 112. Comprehensive Monte-Carlo simulations accompany the data analysis. Nuclear structure models provide a first level interpretation.