TRIGA-SPEC: Developement platform for MATS and LaSpec at FAIR Double-beta transition Q-value measurements with TRIGA-TRAP NUSTAR Meeting 29.02.12 Christian.

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Presentation transcript:

TRIGA-SPEC: Developement platform for MATS and LaSpec at FAIR Double-beta transition Q-value measurements with TRIGA-TRAP NUSTAR Meeting Christian Smorra T. Beyer, K.Blaum, M. Block, Ch. E. Düllmann, K. Eberhardt, M. Eibach, S. Eliseev, Sz. Nagy, W. Nörtershäuser, D. Renisch, and the TRIGA-SPEC collaboration Outline:  TRIGA-SPEC experiment  Mass measurements with Penning traps  Resonant enhancement of double-electron capture  Experimental results  Conclusions and Outlook

Ground-state properties of exotic nuclei Laser Spectroscopy Mass Spectrometry nuclear binding energy = ? mass differences, e.g. separation energies reaction Q values nuclear nuclear spin radius magnetic spectroscopic moment quadrupole moment MATS LaSpec

Future Facility MATS & LaSpec at FAIR RFQ cooler & buncher MR-TOF MATS EBIT Laser Spectroscopy Dipole magnet Gas cell for more information see: Technical Design Report of MATS & LaSpec: D. Rodriguez, EPJ Special Topics 183 (2010) Low-energy branch behind the Super-FRS

TRIGA-SPEC: Development platform for MATS and LaSpec TRIGA-TRAP TRIGA-LASER W. Nörtershäuser online ion source Mass separator RFQ Nucl. Instrum. Meth. A 594, 162 (2008) project TRIGA: 01/08

The TRIGA-TRAP experiment Purification trap: Cleaning of unwanted ion species by buffer- gas cooling Preparation of a mono- isotopic ion bunch Precision trap: High-precision mass measurements with single ions Laser ablation ion source Surface ion source Beam analysis MCP Cryostat / 4K Electronics TOF-ICR Detectors 7 T magnet top view 1 m

Principle of Penning trap mass spectrometry Cyclotron frequency: B q/mq/m PENNING trap Strong homogen. magnetic field Weak electric 3D quadrupole field B - + z

Time-of-flight ion-cyclotron-resonance (TOF-ICR) method MCP Detector 1) Ion excitation in the trap 2) Adiabatic conversion of radial energy to axial energy 3) Detection

Mass and Q-value determination Required precision for double-beta Q values: ~ 100eV – 1 keV Relative uncertainty of the frequency ratio: ~10 -9 – Ion of interestReference ion Mother nuclideDaughter nuclide

Neutrinoless double-electron capture (0  ) 2  (T 1/2 >10 24 y)0  (T 1/2 >10 30 y) Is the neutrino a Majorana or Dirac particle? Search for nuclides with  =( Q   B 2h -E  ) < 1 keV by measurements of Q  –values 2  (T 1/2 ~10 20 y)0  (T 1/2 >10 25 y)

Resonance enhancement factors S. Eliseev, Phys. Rev. Lett. 106, (2011)

/ keV / keV / keV / keV (0.4) (2,3) (7) (0.56) -0.73(0.69) SHIPTRAP: (0.10) -0.33(0.41) 0.0 (0) (6) (0.55) > (0.005) (0.022) (1.6) 11.3 (1.6) 2004 (11) (1.2) ISOLTRAP: (0.64) TRIGA-TRAP Q-value measurement results M. Goncharov et al., Phys. Rev. C 84, (2011) C.S. et al., Phys. Rev. C 85, (2012) D. Fink et al., Phys. Rev. Lett. 108, (2012)

Results: Cadmium and palladium masses AME 2003

Conclusions and Outlook Thank you for your attention!  Q-value measurements of double-beta transitions of 106 Cd, 108 Cd, 110 Pd and 184 Os with TRIGA-TRAP  Uncertainties of the Q-values and mass values were improved  Resonance condition of 106 Cd, 108 Cd and 184 Os were investigated  TRIGA-SPEC serves as a development platform for MATS and LaSpec at FAIR  FT-ICR detection system for MATS  Online coupling to the TRIGA reactor (Ion sources, RFQ Buncher, etc.)