AG Nörtershäuser

Welcome to AG Nörtershäuser

Group photo, taken on Sept. 25th 2020 at the Castle Frankenstein in the Odenwald (south of Darmstadt) by Felix Sommer. f.l.t.r.: Konstantin Mohr, Laura Renth, Tim Ratajczyk, Simon Rausch, Felix Sommer, Max Horst, Patrick Müller, Philipp Bollinger, Tim Lellinger, Jörg Krämer, Wilfried Nörtershäuser, Phillip Imgram

Laser spectroscopic nuclear chart

Our Service to the Community:
An up-to-date nuclear chart with all isotopes that have been investigated by on-line laser spectroscopy, tables and references is provided here …>

Current News

  • 2021/06/07

    Felix Sommer defends his PhD thesis successfully

    Felix Sommer defended his Dissertation entitled “Nuclear Charge Radii across the N=Z=28 Shell Closure in Nickel Isotopes”. Congratulations from the whole LaserSphere team Felix!

  • 2021/05/21

    GHG-Awards for Members of LaserSphere

    Prices of the Gerhard-Herzberg Gesellschaft (GHG) have been awarded during todays Physics Colloquium at TU Darmstadt. Members of our working groups have been distinguished in almost all categories:
    Manuel Simon, who performed his bachelor thesis research in our group, was awarded a B.Sc. Study Price

  • 2021/05/11

    Offline measurements on stable nickel isotopes are published

    Our paper on “Isotope-shift measurements and King-fit analysis in nickel isotopes” has been published in Physical Review C. Off-line measurements of stable nickel isotopes were performed at the BECOLA setup at MSU and are in good agreement with previous measurements at COLLAPS.

  • 2021/05/05

    New DFG project granted

    ALIVE stands for "Accurate Laser-Involved Voltage Evaluation"

    The German Research Foundation (DFG) supports our Developments towards precise high-voltage measurements for three years. Our application entitled “Laser-Based High-Voltage Metrology with 1 ppm Accuracy” has been fully funded.

  • 2021/05/03

    Laser Spectroscopy of C3+ at half the speed of light

    Spectroscopic results for the two 2s-2p resonance lines in lithium-like carbon ions appeared today in the journal Scientific Reports. The ions were stored in the experimental storage ring ESR at GSI at about half the speed of light and a new continuous-wave UV laser system

  • 2021/04/10

    Mg+ beamtime at CRYRING@ESR

    Depending on the frequency of the repump laser, either the lower or upper hyperfine structure component of the D1-Line of 25Mg+ can be addressed by the spectroscopy-laser.

    A magnesium beam time took place at CRYRING@ESR from March 22 to 31. In advance, a new laser system was commissioned (see here), allowing us to address the ions simultaneously in collinear and anti-collinear geometry.

  • 2021/04/08

    Lisa Raymann has completed her Bachelor Thesis

    Lisa Raymann has completed her Bachelor Thesis with the presentation „Characterization of mirror systems for the optical detection in collinear laser spectroscopy“. Congratulations!

  • 2021/03/11

    New Laser at CRYRING@ESR installed

    A Mixtrain from the Company Sirah Lasertechnik was installed in the laser laboratory at CRYRING@ESR. It is combined with the new MATISSE 2 titanium-sapphire laser and a wavetrain to produce light at 280-nm, which will be used in the beamtime on Mg+ ions end of March.

  • 2021/02/04

    Have we seen first optical pumping in a storage ring?

    This question is investigated in our paper published today in Physical Review Accelerators and Beams.
    We study optical pumping in the ESR using a rate equation approach to explain the disappearance of an optical resonance in Li+ when changing for linear to circular polarized light.

  • 2021/01/25

    First laser spectroscopic studies of short-lived Al isotopes published

    First laser spectroscopic results of short-lived Al isotopes appeared today in Physical Review C. The measurements were carried out at the COLLAPS beamline at ISOLDE/CERN. Besides the changes in charge radii, the magnetic and quadrupole moments were determined and compared with ab-initio calculations