Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 16: Struktur und Dynamik von Kernen IV
HK 16.4: Vortrag
Dienstag, 22. März 2011, 15:00–15:15, O-1
Direct mass measurements at the doorway to the region of superheavy elements — •Enrique Minaya Ramirez — Helmholtz-Institut Mainz — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt
The exploration of the nuclear shell structure requires knowledge of the binding energy. A direct way to obtain this quantity is to perform high-precision mass measurements. Furthermore, the combination of α-decay spectroscopy and directly measured masses in the heavy and superheavy (Z ≥104) element region allows determining the masses of higher-Z nuclides which supports the search for the island of stability. Recently, the masses of the nuclides 255No and 255,256Lr have been measured with high accuracy using the Penning trap mass spectrometer SHIPTRAP at GSI Darmstadt. The radionuclides were produced in fusion-evaporation reactions and separated from the primary beam by the velocity-filter SHIP. In addition, the accuracy of the 252No and 254No masses was further improved. Our measurements are the first measurements of the masses of 255,256Lr that have been only estimated from systematic trends until now. The new investigations follow our pioneering experiments at SHIPTRAP with the first direct mass measurements of three nobelium isotopes 252−254No. Only 10 nuclides of 256Lr are produced per minute, which is the lowest rate ever investigated at an on-line Penning trap mass spectrometer. Work supported in part by BMBF.