Berlin 2005 – wissenschaftliches Programm

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SYAM: Atomare Präzisionsmassenspektrometrie

SYAM 2: Atomare Pr
äzisionsmassenspektrometrie

SYAM 2.1: Hauptvortrag

Montag, 7. März 2005, 14:00–14:30, HU Senatssaal

Recent trends in the determination of nuclear masses — •Juha Äystö — Department of Physics, University of Jyväskylä, Finland

Mass of a nucleus results from its binding energy and masses of its constituent nucleons. Strength of binding, a result of strong interaction acting in a finite many-body system of protons and neutrons, carries fundamental information on the microscopic structure of the nucleus. Measurement of binding energy with relative precisions in the range from 10-6 to 10-8 is necessary to unravel predicted new phenomena in nuclear structure of exotic nuclei with abnormal proton to neutron number ratios. Precision measurements of nuclear masses have also important role in nuclear astrophysics and fundamental symmetries and interactions.

This talk presents recent trends and some precision studies of masses of exotic nuclei with high neutron-excess of interest for nuclear structure and shapes of nuclei, as well as of neutron-deficient nuclei of interest for nucleosynthesis in stellar processes. These measurements have become possible only recently due to employment of Penning traps coupled to fast injection of ions. The talk will discuss selected results from the ISOLTRAP facility at CERN and the IGISOL facility at the University of Jyväskylä in Finland.