1. Reiner Krücken Welcome to Kloster Banz

2. Reiner Krücken The Munich Accelerator for Fission Fragments at the FRM II in Garching Facility Overview Status of MAFF Costs and Timeline Physics Case Forschungsreaktor München II (FRM-II): Research reactor at Garching

3. Reiner Krücken FRM II Neutron flux: 8·10 14 n/cm 2 s Power: 20MW Fully operational since fall 2004

4. Reiner Krücken MAFF at the FRM II in Garching Fission Source 10 14 fission/sec Mass- separator 5.9-7 AMeV LINAC MINIBALL / AGATA Source exchange unit Magnetic separator MAFF-Trap charge breeder Factor 100-1000 more intense beams compared to REX-ISOLDE

5. Reiner Krücken MAFF Source side Source exchange unit Source trolley Source ( 1g UC 2 ) O. Kester P. Thirolf W. Assmann M. Groß D. Habs (LMU)

6. Reiner Krücken MAFF source Target: 25g Graphit with up to 1,2g 235 U Operation temperature: 2400°C Materials: Re, Mo, W, BeO Calculated emittance at 30keV:  =12  mm mrad First prototype Materials: Fe, Ta, W, BeO measured emittance at 30keV:  =25  mm mrad Fissions/s of 1,2g U: 1,49 10 14 /s Uranium buring in 52 days: 17%

7. Reiner Krücken He Kryo-panel

8. Reiner Krücken MAFF Extraction x Electrostatic lenses Mass separator Fission source 10 14 fission/sec Deflector plates Extraction lens Triplet Prototype T. Faestermann F. Nebel R. Krücken (TUM)

9. Reiner Krücken Ion optics for the extraction Configuration following Mattauch und Herzog Mass resolution: Laser

10. Reiner Krücken

11. GaKr Sn MAFF yields in comparison Ga, Kr, Sn are some of the EURISOL reference beams Intensities of post-accelerated beams 124126128130132134136138140 10 4 5 6 7 8 9 11 Post-accelerated Yield [s ] Mass Number MAFF EURISOL SPIRAL 2 (10 13 fps) SUPER-FRS 10 9

12. Reiner Krücken Status of the MAFF project beam pipe SR6 is installed Ion source: First prototype of the ion source has been built and tested Final version ready for assembly and testing (EURONS/SAFERIB) 235 U source material available prototype of beam pipe at MLL for tests of ion source and cryo-panel prototype of cryo-panel constructed, test in 2005 (EURISOL DS) prototype of lens trolley under construction detailed calculations for distribution of radioactivity performed design of other system components e.g. vacuum system, source changer, and mass separator completed charge breeder under design (EURONS/Charge Breeding) stage 1 of the authorization procedure in 2005 / 2006 Instrumentation: MINIBALL under routine operation at REX-ISOLDE (using MAFF resonator) MAFF Trap magnet commissioned, trap parts completed

13. Reiner Krücken MAFF costs MAFF - ISource & Source changing unit3100 T€ (inside FRM 2 building)Beam extraction3200 T€ System control & survey900T€ Vacuum system2200 T€ Liquid Helium System2300 T€ Infrastructure1900 T€ TÜV (authorization procedure)1600 T€740 T€ 15200 T€ MAFF - IIBeam preparation & transport1200 T€ LINAC5300 T€677 T€ Vacuum system400 T€ System control & rad. Surv.500 T€ 7400 T€ InstrumentationMINIBALL3000 T€ MAFF-Trap300 T€ MORRIS Recoil Separator1000 T€ 4300 T€ Total26900 T€4717 T€ financed

14. Reiner Krücken MAFF timeline 1 st stage of authorization procedure (2005/06) construction of MAFF-I: 5-6 years (constraint by funding) construction of MAFF-II: 3 years (partly parallel to MAFF-I) MAFF funding mixed funding planned from MLL, BMBF (federal), State of Bavaria, EU, external partners

15. Reiner Krücken Structure of neutron rich exotic nuclei Nuclear astrophysics Production and chemistry of superheavy elements Nuclear medicine Material science The physics of MAFF Opportunities to be discussed at this workshop !!

16. Reiner Krücken Using higher beam intensities for spectroscopic studies 10 10 8 10 6 10 4 10 2 1 A REX-ISOLDE MAFF detailed spectroscopy More exotic nuclei Produktionsrate B(E2), S, g E(J i ), etc. M, T 1/2, E(2 1 + )

17. Reiner Krücken Mass deviations in neutron-rich nuclei Results from JYFL New mass measurements, e.g. at JYFL, show that masses from beta- end-point energies in neutron-rich nuclei are systematically wrong Better mass measurements needed, e.g. for r-process calculations Highly charged ions will improve accuracies significantly Zr

18. Reiner Krücken MAFF-trap RFQ buncher extraction RFQ cooler MORRIS gas stopping chamber ~1 MeV/u 30 kV platform MAFF ion source mass separator 30 keV electrostatic deceleration charge breeder RF funnel cooler/ buncher 1. purification PT 2. mass meas./ in-trap spectr. PT phase 1 (masses of fission fragments) phase 2 (masses of reaction products, e.g. SHE) high res. mass sep. 1. purification PT 2. mass meas./ in-trap spectr. PT B=7 T superconducting magnet (MAGNEX) has arrived in 2004.

19. Reiner Krücken MINIBALL

20. Reiner Krücken 10 9 RIB on Pb/Bi 3·10 9 132 Sn on various targets The SHE reach of MAFF S. Hofmann, Nucl. Phys. News Intl We need reliable cross-section calculations!! 108 110 112 114 120

21. Reiner Krücken What do we want from you? We want to collect / update ideas for the MAFF physics case Basic question: Where can MAFF make unique contributions? What makes MAFF unique? high intensity of fission fragments detailed spectroscopy possible reaching more exotic nuclei fusion evaporation reactions with n-rich beams parallel operation of low and high energy beam possible capability to perform long experiments (e.g. for SHE) Next steps MAFF white paper by fall 2005 MAFF technical report by end of 2005 Authorization procedure (1 st stage) finished by end of 2006

22. Reiner Krücken Post-accelerated MAFF beams Heavier elements not shown!

23. Reiner Krücken

24. What makes MAFF unique? high intensity of fission fragments detailed spectroscopy possible (Coulex, transfer, g—factors, lifetimes, etc.) reaching more exotic nuclei extending mass measurements decay spectroscopy fusion evaporation reactions with n-rich beams parallel operation of low and high energy beam possible capability to perform long experiments (e.g. for SHE) it is relatively cheap !!

25. Reiner Krücken Heavy and superheavy elements Reaction studies (isospin dependence of   ) chemistry with long lived SHE isotopes connecting the bottom of the Dubna chains shell structure near 78 Ni, 132 Sn single-particle energies, occupancies masses, g-factors, lifetimes evolution of residual interactions search for effects of diffuse surface (shell quenching) shape evolution shape transitions shape coexistence r-process nuclei masses, T 1/2, GT strength

26. Reiner Krücken Using higher beam intensities for spectroscopic studies 10 10 8 10 6 10 4 10 2 1 A REX-ISOLDE MAFF detailed spectroscopy More exotic nuclei Produktionsrate B(E2), S, g E(J i ), etc. M, T 1/2, E(2 1 + )