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ISOLDE Physics Group Meeting (PGM) and Seminar

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508/1-001 (CERN)

508/1-001

CERN

20
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Weekly Physics Group Meeting (PGM)
Zoom Meeting ID
67668818133
Host
Hanne Heylen
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    • 14:00 → 14:15
      General announcements 15m
      Speakers: Hanne Heylen (CERN), Prof. Luis M Fraile (CERN)
    • 14:15 → 14:20
      Safety announcements 5m
      Speakers: Hanne Heylen (CERN), Prof. Luis M Fraile (CERN)
    • 14:20 → 14:25
      Visits 5m

      Rota to be found on: https://cernbox.cern.ch/s/qbqEUB41tAvAzWa

      Speakers: Hanne Heylen (CERN), Victoria Vedia (CERN)
    • 14:25 → 14:30
      AOB 5m
      Speakers: Amy Sparks, Carlotta Porzio (CERN), Christoph Schweiger (Max Planck Society (DE)), Hanne Heylen (CERN), Jessica Warbinek (CERN), Juliana Schell (Institut Fur Materialwissenschaft Universität Duisburg-Essen (DE)), Liss Vazquez Rodriguez (Max Planck Society (DE)), Prof. Luis M Fraile (CERN), Magdalena Kowalska (CERN), Patrick MacGregor (CERN), Peter Plattner, Tim Enrico Lellinger (Max Planck Institute for Nuclear Physics), Victoria Vedia (CERN)
    • 14:30 → 14:50
      ISOLDE seminar or Physics presentation by local group 20m

      Title: Finding the “missing link” for nuclear quadrupole moments – Case 2, Sn
      Speaker: Heinz Haas, University of Aveiro and CERN EP Division (for projects IS640, IS673, IS703)
      Abstract: There are basically two ways to determine precision values for nuclear quadrupole moments (Q): Measurements for stable or reasonably long-lived (mostly ground) states by atomic and molecular spectroscopy or for much shorter-lived excited states using nuclear condensed matter techniques like Mössbauer (MS) or perturbed angular correlation (PAC) spectroscopy. In all cases the direct experimental result is the product of the electric field gradient (EFG) at the nuclear site with Q. The EFG for atomic and simple molecular systems can now mostly be obtained from theory with good accuracy, while the present status of density functional calculations for the solid-state systems used with short-lived excited states limits the accuracy to the 10 to 20% level. For Cd and Hg we had overcome this limitation by measuring isolated linear molecules using PAC. Similar experiments are in preparation for 204mPb. For the MS state in 119Sn such an approach is practically impossible. The presented analysis, using nuclear, atomic, molecular and solid-state theory, however, demonstrates that the now accepted value of Q=.132(1)b is grossly wrong and should be replaced by Q=.096(4)b.

      Speakers: Carlotta Porzio (CERN), Hanne Heylen (CERN), Jessica Warbinek (CERN)