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
QCD at shortest distances(elementary particles,
Hadron properties, SUSY, GUT)
QCD at large distances(Hadrons & Nuclei)
Applications of nuclear methods Material analysis
Medical applications & imagingRadiation biology
Neutrino propertiesDark matter
Electroweak interactions
Nuclear astrophysicsCosmology
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)
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tsBuras (TUM) Fritsch (LMU)Lüst (LMU)Ratz (TUM)
Ring (TUM) Weise (TUM) Wolter (LMU)
Buras (TUM) NN(TUM)
Mukhanov (LMU)Ring (TUM)
Theory
DFG Cluster of ExcellenceOrigin and Structure of the Universe
www.universe-cluster.de
MLL Tandem laboratory
14 MVTandem
Ion sources:- Polarized hydrogen- Sputter source- AMS source
MLL Tandem: Nuclear SpectroscopyQ3D: 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 ≈ 10-10
Experimental search for 0+ states at Q3D
2005 (D.A. Meyer)
Plot by Ryan Winkler (Yale)
- (p,t) reactions - using 25 MeV protons- 3-5 angles
MLLUni KölnYaleBucharestSurrey
M. Csatlos et al., Phys. Lett. B 615 (2005) 175.
deep third minimum:
EIII = 2.7(4) MeV
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
Investigating the multiple-humped fission barrier in Actinides: 236U
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)
MLL Tandem: MLL Trap Project
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
Concept of the MLLTRAP Concept of the MLLTRAP facilityfacility
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 ≈ 10-10
Physics: Q values for Vud MLL masses from radioactive beams GANIL (SPIRAL 2)