JINR SCIENTIFIC COUNCIL 106 nd Session, 24 September 2009, Dubna

1. JINR SCIENTIFIC COUNCIL 106nd Session, 24 September 2009, Dubna STATUS of MAJOR BASIC FACILITY PROJECTS of the SEVEN-YEAR: DRIBs – III PROJECT S.N. DMITRIEV Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research

2. 1. Heavy and superheavy nuclei • Synthesis and study of properties of superheavy elements • Chemistry of new elements • Fusion-fission and multi-nucleon transfer reactions • Mass-spectrometry and nuclear spectroscopy of SH nuclei BASIC DIRECTIONS of RESEARCH • 2. Light exotic nuclei • Properties and structure of light exotic nuclei • Reactions with exotic nuclei 3. Radiation effects and physical bases of nanotechnology

3. SOME RESULTS in STUDY of SUPERHEAVY NUCKLEI Synthesis of 5 new elements and 34 new superheavy isotopes Limiting role of quasi-fission in synthesis of SH nuclei Relativistic chemistry of SHE Spectroscopy of SH nuclei

4. SOME RESULTS in STUDY of EXOTIC NUCKLEI Discovery of di-neutron inside 6He Observation of energy structure of neutron-rich exotic nuclei 5H, 7H, 10He Observation of sub-barrier fusion enhancement of 6He

5. DRIBs-III • Modernization of existing accelerators (U400М &U400) • Creation of the new experimental hall (≈ 2600 м2) • Development and creation of next generation set-ups • Creation of high current heavy ion accelerator (A≤ 100, E ≤ 10 MeV ·A , I≥10 pµA) 2010 -2016 ≈ 60 М$

6. U400M CYCLOTRON

7. 2007 - 2009 • new axial injection line; • new “warm” ECR ion source (DECRIS-2); • new magnetic structure of the central region of U400MR; • second beam extraction system; • new producing target for secondary beams; • new local radiation shielding; • superconducting 18-GHz primary beam ion source DECRIS-SC2 (under testing); • “warm” 14-GHz secondary beam ion source (under testing).

8. MODERNIZATION of the U400M CYCLOTRON • The main goals of modernization are achieved (the light ion beams intensity, the quality of beams, acceleration of “low” energy ions) • The critical point becomes the operation stability (now is ≈50%) caused by existing infrastructure • We can not modernize it we need to create the new one

9. U400 CYCLOTRON

10. U400  U400R GOALS • Beam intensity of masses A ≈ 50 and • energy ≈ 6 MeV/n up to 2.5 pμA • Ion energy variation on the target with factor 5 • Energy spread on the target up to 10-3 • Beam emittance on the target – 10 π mm · mrad • Cyclotron average magnetic field level • from 1.8 to 0.8 T • New equipment The project is fully prepared!

11. 237Np 243Am 242Pu, 245Cm 117/293 117/294 244Pu, 248Cm 249Cf 115/289 115/290 113/285 113/286 249Bk +48Ca T1/2= 320d T1/2= 320d 111/282 111/281 109/277 109/278 • Collaboration: • FLNR (Dubna) – ORNL (Oak-Ridge) – • LLNL (Livermore) – IAR (Dmitrovgrad) • Vanderbilt University (Nashville) 107/274 107/273 105/270 105/269 104/269 104/270 103/266 102/266 164 48Ca + Decay chains

12. Expected decay chain of the isotopes of element 117 A. Sobiczewski10/24.03.09

13. Next generation of experimental setups • Heavy and superheavy nuclei • Synthesis of superheavy elements • Chemistry of new elements • Fusion-fission and multi-nucleon • transfer reactions • Mass-spectrometry and nuclear • spectroscopy of SH nuclei Basic directions of research 1. Universal gas-filled separator of superheavy nuclei 2. Pre-separator for radiochemical and mass-spectrometric researches 3. Cryogenic detector for studying chemical properties of SHE 4. Gas catcher for collecting and production of single-charged ions 5. Wide aperture separator and spectrometer of nucleon transfer and fission reaction products 6. Radiochemical laboratory of II class • Light exotic nuclei • Structure of light exotic nuclei • Reactions with exotic nuclei 7. Separator of radioactive light exotic nuclei 8. Spectrometer for studying nuclear reactions induced by RIBs

14. STATUS of the MASS-SPECTROMETER Mass-spectrometer MASHA at the beam line of the cyclotron U-400M • New beam line with low energy of the U-400M was built • Mass-spectrometer mounted at the new beam line • Hot catcher is ready • Focal plane detector system is ready • Start of test experiments – december of 2009

15. FIRST EXPERIMENTS • Mass identification of 112 и 114 elements synthesizedat the reactions • 242Pu(48Ca,3n)287114(0.5 s) –> 283112(4 s) • Mass identification of 113elements synthesizedat the reaction • 243Am(48Ca,3n)288115 (0.1 s) →284113 (0.5 s)

16. From ECR SOURCE to GAS CATCHER Experimental facility for very heavy nuclei research Main parameters of recoil separator • Solid angle ~ 30 msr. • Momentum acceptance – 10%. • Magnetic field – Bmax=0.3 T. • Electric field – Emax=10 kV/cm. • Focal plane beam diameter – 8cm. • Total length – 8 m.

17. “VASSILISSA” based velocity filter for nuclear spectroscopy (joint JINR – IN2P3 project)

18. Acculinna−2 as ‘in−flight’ separator at U−400M cyclotron GS DRIBs RF kicker operating principle:Beam species that have similar Br differ in TOF ACCULINNA-2 COMBAS ACCULINNA

19. STATUS of PROJECT: 1) Letter of Intent (60 pages) 2) Complex calculation of ion−optical system

20. COMBAS + MSP COMBAS MSP Achromatic Mode Solid Angle Acceptance Ω(msr) 12 Momentum Acceptance Δp/p(%) 20 Factor Suppression % 50-80 Dispersion Mode (MSP) Momentum Resolution 2×10-4 Length focal plane cm 150 Emax/Emin 5.2 Factor Suppression % 0.1

21. NEW GAS-FILLED SEPARATOR

23. DC200. MAIN PARAMETERS

24. DC200 CYCLOTRON DESIGN

25. NEW RESOURCES AND RESEARCH OPPORTUNITIES

26. NEW EXPERIMENTAL HALL

27. Financing (M$) and gain factors for SHE experiments Experiment 1 Experiment 2 Experiment 2×2 Experiment 20 (10 fb)

28. Completion of the Project DRIBs-III in the whole will not only increase by an order of magnitude the efficiency of experiments in the field of SHE synthesis, but will also allow substantially widen the spectrum of researches in the field of heavy and light exotic nuclei.

29. THANKS FOR YOUR ATTENTION!