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The Maier-Leibnitz-Laboratory for Nuclear and Particle Physics of LMU Munich and TU Munich Nuclear Structure Studies at the MLL Tandem accelerator Prof.

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Presentation on theme: "The Maier-Leibnitz-Laboratory for Nuclear and Particle Physics of LMU Munich and TU Munich Nuclear Structure Studies at the MLL Tandem accelerator Prof."— Presentation transcript:

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

3 DFG Cluster of Excellence Origin and Structure of the Universe

4

5 MLL Tandem laboratory 14 MV Tandem Ion sources: - Polarized hydrogen - Sputter source - AMS source

6 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 Electron conversion spectroscopy: - E0 strength in deformed nuclei - states in 2nd and 3rd minimum 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: m/m

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

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

9 MLL Tandem: MLL Trap Project

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

11 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: m/m Physics: Q values for V ud MLL masses from radioactive beams GANIL (SPIRAL 2)

12 transmission resonance spectroscopy: Transmission resonances in prompt fission probability: coupling of compound states in 1. minimum to collective states in 2. and 3. minimum Munich Q3D magnet spectrograph: P. Thirolf, D. Habs, in collaboration with group of A. Krasznahorkay (Debrecen) reaction: 235 U(d,pf) 236 U, E d = 10 MeV (Fission)-lifetimes of states in 3. minimum too short for direct spectroscopy: s – s focal plane detector: energy resolution: ca. 5 keV Investigating the multiple-humped fission barrier in Actinides: 236 U

13 Investigation of 229m Th search for the 7.6 eV unique perspectives: - nuclear metrology - coherent excitations - potential improvement in / ~ recent measurement: (3.5 ± 1.0) eV (7.6 ± 0.5) eV = 163± 11 nm R. Beck et al., PRL 98 (2007) m Th transition = bridge between nuclear physics and laser physics 229 Th: nucleus with lowest-lying excited state in nuclear physics: isomeric lifetime ~ 1-5 hrs extremely sharp transition:. - population via decay from 233 U - high-precision identification of transition energy (optical wavelength) - later: detection of resonance absorption of ~163 nm photon from frequency comb (collaboration with T. Udem et al., MPQ)

14 Experiment at Munich Tandem K. Wimmer (LMU)

15 Summary of E0 measurements K. Wimmer (LMU) 154 Sm 166 Er 127(60) IBA predictions of large E0 strength in deformed nuclei confirmed

16 Increased 0 + density at the shape phase-transition D.A. Meyer et al., PLB 638 (2006), spdf

17 Expectations for large (unrealistic) Boson numbers Further X(5) candidates: 150 Nd, 152 Sm N B =30 R 4/2 =2.0 R 4/2 =3.33 R 4/2 =2.5 =0.8 D. Meyer et al.


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