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Masses of exotic calcium isotopes pin down nuclear forces

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons30312

Blaum,  K.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30324

Borgmann,  Christopher
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30363

Cakirli,  R. Burcu
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
University of Istanbul, Department of Physics;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30722

Kreim,  Susanne Waltraud
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
CERN;

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Zitation

Wienholtz, F., Beck, D., Blaum, K., Borgmann, C., Breitenfeldt, M., Cakirli, R. B., et al. (2013). Masses of exotic calcium isotopes pin down nuclear forces. Nature, 498(7454), 346-349. doi:10.1038/nature12226.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0013-F641-2
Zusammenfassung
The properties of exotic nuclei on the verge of existence play a fundamental part in our understanding of nuclear interactions. Exceedingly neutron-rich nuclei become sensitive to new aspects of nuclear forces. Calcium, with its doubly magic isotopes 40Ca and 48Ca, is an ideal test for nuclear shell evolution, from the valley of stability to the limits of existence. With a closed proton shell, the calcium isotopes mark the frontier for calculations with three-nucleon forces from chiral effective field theory. Whereas predictions for the masses of 51Ca and 52Ca have been validated by direct measurements, it is an open question as to how nuclear masses evolve for heavier calcium isotopes. Here we report the mass determination of the exotic calcium isotopes 53Ca and 54Ca, using the multi-reflection time-of-flight mass spectrometer of ISOLTRAP at CERN. The measured masses unambiguously establish a prominent shell closure at neutron number N = 32, in excellent agreement with our theoretical calculations. These results increase our understanding of neutron-rich matter and pin down the subtle components of nuclear forces that are at the forefront of theoretical developments constrained by quantum chromodynamics