Nanuf03, Bucharest, 7.-12. 9. 2003Stefan Kopecky Traps for fission product ions at IGISOL Experimental Facilities Mass Measurements Status and Future Perspectives.

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Nanuf03, Bucharest, Stefan Kopecky Traps for fission product ions at IGISOL Experimental Facilities Mass Measurements Status and Future Perspectives Experimental Facilities Mass Measurements Status and Future Perspectives

Nanuf03, Bucharest, Stefan Kopecky IGISOL Fission Yields

Nanuf03, Bucharest, Stefan Kopecky IGISOL (Ion Guide Isotope Separation Online) Short delay Times Chemical Insensitive Large Energy Spread (100 eV) Continuous Beam

Nanuf03, Bucharest, Stefan Kopecky RFQ-Trap Layout

Nanuf03, Bucharest, Stefan Kopecky RFQ-cooler

Nanuf03, Bucharest, Stefan Kopecky Radial confinement +Vcos  t -Vcos  t

Nanuf03, Bucharest, Stefan Kopecky Axial confinement Transmission 50 % Bunch width 2-3  s Energy spread <1 eV

Nanuf03, Bucharest, Stefan Kopecky Collinear Laser-Spectroscopy increased by a factor of 10 reduced by a factor of 20 =R ph  T gate /T acc =  F overlap  F doppler   geom   PM  F atom

Nanuf03, Bucharest, Stefan Kopecky Magnet 7T superconducting Magnet Magnex Scientific Ltd 160mm warm bore 2 homogenous regions 1cm and 10 -7

Nanuf03, Bucharest, Stefan Kopecky Purification Trap Electrode Structure

Nanuf03, Bucharest, Stefan Kopecky Radial Motion without buffer gaswith buffer gas Magnetron motion  - Cyclotron motion  +  - +  + =  C = qB/m Cyclotron radius decreases Magnetron radius increases

Nanuf03, Bucharest, Stefan Kopecky Dipol –Excitation with  - HP33120A

Nanuf03, Bucharest, Stefan Kopecky Quadrupol –Excitation with  C 126 Xe HP33120A

Nanuf03, Bucharest, Stefan Kopecky Fast-scheme Total cycle time 120ms p = 9.9 e-2 mbar Cooling time 55 ms  - 5ms / 300mV  C 55ms / 350mV FWHM = 35Hz R = m/  m = Xe

Nanuf03, Bucharest, Stefan Kopecky Best Mass resolution 58 Cu 58 Ni FWHM=13,6Hz R= Mass Excess Our result: /- 30keV AME95: /- 2.5keV FWHM=13,8Hz R=134100

Nanuf03, Bucharest, Stefan Kopecky Purification Trap Transmission between % – spark ion source, stable Xe, Faraday-cup –  -activity, Fission products A=112 ( Rh-112), Si-detector Capturing efficiency of trap 60% Total Efficiency 20%  Front end for Precision Trap  Isobaric pure beams for Decay Spectroscopy  Mass Measurements

Nanuf03, Bucharest, Stefan Kopecky p-induced fission, A=112 Ru-112 T 1/2 =1.75s Rh-112 T 1/2 =2.1s Q  =3.670MeV Pd-112 T 1/2 =21.03h Q  =6.8 MeV

Nanuf03, Bucharest, Stefan Kopecky Beam Purification

Nanuf03, Bucharest, Stefan Kopecky Tof-methode

Nanuf03, Bucharest, Stefan Kopecky Tof-resonance

Nanuf03, Bucharest, Stefan Kopecky Fundamental interactions and symmetries (< 1 keV) –Q-values of nuclear  decay CVC theory and unitarity of CKM matrix Search for scalar and tensor currents Charge symmetry in nuclei (1 keV) –Isospin multiplets and Coulomb energy differences Nuclear structure ( keV) –Global correlations (100 keV) –Local correlations (10 keV) Local deformation, coexistence, mixing and pairing –Drip-line phenomena and halos (10 keV) Nuclear astrophysics (>10 keV) What level of accuracies are needed?

Nanuf03, Bucharest, Stefan Kopecky Structure of neutron-rich Zr-isotopes ” Ground state changes from spherical to deformed via coexistence” See, G. Lhersonneau et al.,Phys. Rev. C49(1994)1379 & refs. No reliable direct mass measurements existed so far!

Nanuf03, Bucharest, Stefan Kopecky 104 Zr Total cycle time 450ms p = 3 e-2 mbar Cooling time 330 ms  - 15ms / 160mV  C 90ms / 190mV FWHM = 18 Hz R = Zr-measurement

Nanuf03, Bucharest, Stefan Kopecky preliminary Zr results

Nanuf03, Bucharest, Stefan Kopecky preliminary Zr results

Nanuf03, Bucharest, Stefan Kopecky Nuclear Mean Field Calculation Stoitsov M.V, Dobaczewski J. and Nazarewicz W., to be published

Nanuf03, Bucharest, Stefan Kopecky Z=40, A=100 -region Mo Nb Zr Y Sr

Nanuf03, Bucharest, Stefan Kopecky Summary RFQ-Cooler Reduce in energy spread of ion beam (<1eV) Bunching of beam (  s)  Improved condition for Collinear Laser Spectroscopy  Front end for Purification Trap Purification Trap Isobaric Pure beams ( R = ) Cycle Times ( 120ms - 450ms)  Front End for Precision Trap  Decay Spectroscopy of Exotic Nuclei  Mass Measurement for Nuclear Structure Effects Precision Trap  High Precision Mass Measurements