What question did this study set out to answer?

The aim is to clarify conflicting mass assignments and decay energies of light mendelevium isotopes.

April 1, 2026Open Access

Towards the Limits of Stability — New Decay Study of the Lightest Mendeleviums

Puntos clave

The aim is to clarify conflicting mass assignments and decay energies of light mendelevium isotopes.
Conducted experiments at Argonne National Laboratory using a specific nuclear reaction.
Performed simultaneous alpha-decay energy measurement and A/q identification.
Identified recoil-alpha decay chains for isotopes 247Md and 245Md.
Executed probabilistic mass identification based on focal-plane position.
Achieved consistent mass assignments for 247Md and 245Md isotopes within uncertainties.
Re-evaluated production cross sections and decay energies for both isotopes.
Resolved conflicting assignments from prior studies.

Resumen

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

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