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The M aier- L eibnitz- L aboratory for Nuclear and Particle Physics of LMU Munich and TU Munich

The M aier- L eibnitz- L aboratory for Nuclear and Particle Physics of LMU Munich and TU Munich. Nuclear Structure Studies at the MLL Tandem accelerator. Prof. Dr. Reiner Krücken TU Munich Acting Director, MLL. Theory. Buras (TUM) Fritsch (LMU) Lüst (LMU) Ratz (TUM ).

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The M aier- L eibnitz- L aboratory for Nuclear and Particle Physics of LMU Munich and TU Munich

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  1. The Maier-Leibnitz-Laboratory for Nuclear and Particle Physics of LMU Munich and TU Munich Nuclear Structure Studies at the MLL Tandem accelerator Prof. Dr. Reiner Krücken TU Munich Acting Director, MLL

  2. Theory Buras (TUM) Fritsch (LMU) Lüst (LMU) Ratz (TUM) QCD at shortest distances (elementary particles, Hadron properties, SUSY, GUT) Paul (TUM) Schaile (LMU) Ring (TUM) Weise (TUM) Wolter (LMU) QCD at large distances (Hadrons & Nuclei) Habs (LMU) Krücken (TUM) Paul (TUM) Mukhanov (LMU) Ring (TUM) Nuclear astrophysics Cosmology Habs (LMU) Krücken (TUM) von Feilitzsch (TUM) Methodological and Instrumental Developments Buras (TUM) NN(TUM) Electroweak interactions Paul (TUM) von Feilitzsch (TUM) Neutrino astronomy Neutrino properties Dark matter Applications of nuclear methods Material analysis Medical applications & imaging Radiation biology Habs (LMU) Krücken (TUM) Paul (TUM) von Feilitzsch (TUM)

  3. DFG Cluster of ExcellenceOrigin and Structure of the Universe www.universe-cluster.de

  4. MLL Tandem laboratory 14 MV Tandem • Ion sources: • Polarized hydrogen • Sputter source • AMS source

  5. Electron conversion spectroscopy: • E0 strength in deformed nuclei • states in 2nd and 3rd minimum MLL Tandem: Nuclear Spectroscopy Q3D: Light-ion transfer reactions with ~ 5 keV resolution - states in the 2nd and 3rd minimum in actinides - studies of single-particle structure - discovery of multitude of 0+ states - investigation of cluster states • MLL Trap (under construction): • mass measurements of highly charged ions • use of gas-ion-catcher • sympathetic cooling with laser cooled Mg+ ions • simultaneaous use of two precision traps • charge breeding with EBIS final goal: Dm/m ≈ 10-10

  6. Experimental search for 0+ states at Q3D • - (p,t) reactions • using 25 MeV protons • 3-5 angles MLL Uni Köln Yale Bucharest Surrey 2005 (D.A. Meyer) Plot by Ryan Winkler (Yale)

  7. Investigating the multiple-humped fission barrier in Actinides: 236U P. Thirolf, D. Habs, A. Krasznahorkay (Debrecen) • Transmission resonances in prompt fission probability: coupling of compound states in 1. minimum to collective states in 2. and 3. minimum • rotational substructure of transmission resonances resolved in 235U(d,pf)236U, Ed= 10 MeV • rotational band fit of spectrum and angular distribution: • ->resonance is high-K hyperdeformed deep third minimum: EIII= 2.7(4) MeV M. Csatlos et al., Phys. Lett. B 615 (2005) 175.

  8. MLL Tandem: MLL Trap Project

  9. Increased 0+ density at the shape phase-transition 154Gd: D.A. Meyer et al., PLB 638 (2006), 44-49 and PRC 74 (2006) 044309 152Sm: D.A. Meyer, M. Reithner et al., to be published

  10. Concept of the MLLTRAP facility • fusion reaction products from Tandem via buffer gas stopping cell (MLL-IonCatcher) • measurement with Penning trap of highly-charged ions • simultaneous relative measurement of individual ions in two precision traps • (sympathetic) cooling of highly-charged ions with laser-cooled Mg+ ions inside Penning trap and Paul trap • replacement of “classical” preparatory trap inside Penning set-up by A- and Z-selecting devices outside Penning trap • charge breeding with (commercial) EBIS final goal: Dm/m ≈ 10-10 Physics:Q values for Vud MLL masses from radioactive beams  GANIL (SPIRAL 2)

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