the m aier l eibnitz l aboratory for nuclear and particle physics of lmu munich and tu munich l.
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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
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

slide2

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)

mll tandem laboratory
MLL Tandem laboratory

14 MV

Tandem

  • Ion sources:
  • Polarized hydrogen
  • Sputter source
  • AMS source
mll tandem nuclear spectroscopy

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

experimental search for 0 states at q3d
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)

investigating the multiple humped fission barrier in actinides 236 u
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.

increased 0 density at the shape phase transition
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

slide11

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)