Recent decay studies of \ (^244, 245\) Md at the GSI Helmholtzzentrum für Schwerionenforschung, Germany, and at the Lawrence Berkeley National Laboratory (LBNL) reported conflicting mass assignments to similar \ (\) ‑decay energies. This prompted a new experiment at the Fragment Mass Analyzer (FMA) at Argonne National Laboratory. Using the reaction \ (^209 Bi (^40 Ar, xn) ^249-x Md\), we performed simultaneous \ (A/q\) identification and \ (\) -decay energy measurement for neutron-deficient Md isotopes. Correlated recoil-\ (\) -decay chains belonging to \ (^247\) Md and \ (^245\) Md were identified. Probabilistic mass identification was performed from focal-plane position using a test reaction, yielding consistent \ (A=247\) and \ (A=245\) mass assignments within uncertainties. This study re-examines the production cross sections, decay energies, and isotopic assignments for the \ (^247\) Md and \ (^245\) Md nuclei. Abstract Published by the Jagiellonian University 2026 authors
Kumar et al. (Tue,) studied this question.