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a Joint Institute for Nuclear Research, Dubna, Russia

The new intermediate energy in - flight facility ACCULINNA-2. ACCULINNA -2 collaboration

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a Joint Institute for Nuclear Research, Dubna, Russia

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  1. The new intermediate energy in-flight facility ACCULINNA-2 ACCULINNA-2 collaboration A.S. Fomicheva, G.M. Ter-Akopiana, V. Chudobaa, A.V. Daniela, M.S. Golovkova, V.A. Gorshkova, L.V. Grigorenkoa, G. Kaminskia,b, S.A. Krupkoa, Yu.Ts. Oganessiana, S.I. Sidorchuka, R.S. Slepneva, S.V. Stepantsova, S.N. Ershova, V.K. Lukyanova, B.V. Danilinc, A.A. Korsheninnikovc, V.Z. Goldbergd, M. Pfütznere, I.G. Mukhaf, H. Simonf, V.A. Shchepunovg , O.B. Tarasovh, N.K. Timofeyuki, M.V. Zhukovj • RIBs projects at FLNR • ACCULINNA separator • Details of a new RIB facility ACCULINNA-2 aJoint Institute for Nuclear Research, Dubna, Russia bInstitute of Nuclear Physics PAN, Krakow, Poland cRRC The Kurchatov Institute, Moscow, Russia dCyclotron Institute, Texas A&M University, College Station, USA eInstitute of Experimental Physics, Warsaw University, Warsaw, Poland fGesellschaft für Schwerionenforschung mbH, Darmstadt, Germany gUNIRIB, Oak Ridge Associated Universities, Oak Ridge, USA hNSCL, Michigan State University, East Lansing, Michigan, USA iDepartment of Physics, University of Surrey, Guildford, UK jFundamental Physics, Chalmers University of Technology, Göteborg, Sweden

  2. RIBs: now 6He@10 AMeV Low energy beam line Production target and ECR source DIRECT Combas Acculinna DIRECT 400-cm cyclotron and injection line ISOL Electron accelerator Photo-fission induced RIBs (Project) Dubna Radioactive Ion Beams DRIBs-I 400-cm cyclotron stable ion beams: now 7Li@34 AMeV → DRIBs-III 2010-2016

  3. Existingexperimental facilities Planedexperimental facilities Acculinna−2 Acculinna Combas MASHA DubnaRadioactive IonBeamsIII (DRIBs III)

  4. main parameters small angular acceptance Limited space in the final focus plane and, finally, purification of proton-rich secondary beams is not so good. ToF base is short enough - 8.5 m the size of a beam spot at F4 is two times more than it’s at F3 because of optic asymmetry x2 ACCULINNA separator U−400M cyclotron: 7Li,11B,18O @ 33 AMeV 20Ne, 32S @ 50 AMeV “Scientific facilities, which are not upgraded after 10 years of functioning become rotten…” H. Simon@gsi.de * 1996 – first experiment ** 2000 – last upgrade *** 2010 – next step Acc.2

  5. Main results since 2000 4H – Ground state resonance parameters are ER=3.05 MeV, G =4.18MeV 5H – ER = 1.8 MeV, G = 1.3 MeV; continuum above 2.5 MeV as a mixture of energy degenerated broad 3/2+ and 5/2+ states; interference of 3/2+− 5/2+ doublet and 1/2+ g.s. 7H –No peak of 7H near t + 4n threshold was observed, however the excitation spectrum shows the peculiarity at ~2 MeV 6He – Experimental verification of “di-neutron” configuration; t + t clustering revealed; observation of a,2a QFS 8He – Data on 4He+4n, 6He(g.s.)+2n, 6He(2+)+2n, 3H+5H clustering 9He – 1/2+ virtual ground state is proven, scattering length limit a > –20 fm is imposed; broad 1/2− and 5/2+ resonances at ~2 and ~4.5 MeV are obtained Dolores Cortina talk 8He − Cross sections for population of resonant states 0+, 2+, (1+) in 6He+t reaction are determined to be :200, < 250, < 125 b/sr;possibility of a more consistent explanation of the near threshold 8He spectra :E1 peak below 2+ state 10He − The population cross section of the 3 MeV peak in 10He s10 = 140(30) mb/sr is consistent with the estimated resonance cross section for the population of the 10He 0+ state with the [p1/2]2 structure http://aculina.jinr.ru -> publications

  6. Main recent resultsand near future plans 6He, 6Li – Complete and incomplete fusion reaction with rear earth targets 166Er and 165Ho at energy of 10 AMeV 6Be – Two-proton decay of the ground state resonance and properties of exited states in the 6Li(p,n)6Be reaction 26S – Estimation of half-live (T1/2 < 70 ns) and energy of two-proton decay (E > 600 keV) 8He –b-delayed particle emission studies with OTPC; BGT for rear decay branches a+t+n, 7Li+n and 6He+d now future past prepared to be publish 6He, 8He – Further study of the QFS reactions at E ~ 45 AMeV: 6He+4He 2a+2n, 6He+4He a+t+3H, 8He+4He a+6He+2n 17Ne – Possible unique case of two-proton halo study in the 17Ne+p QFS and 18Ne(p,d)17Ne reactions 10He, 13Li, 14Be, 18C– 2n transfer reactions with the use of the cryogenic tritium target and interference of broad states in a level structure

  7. 8He & 10He: 3H(6He,p)8He &3H(8He,p)10He reactions DSSD +SSD DSSD +SSD’s tritium target SSD’s MWPC 6He, 8He Beams E~28AMeV Plastic-Veto

  8. neutron multi detector of 64 modules is beeing constructed, now we have 32 stibene crystals  80 x 50 mm3 8He & 10He: 3H(6He,p)8He &3H(8He,p)10He reactions

  9. S. Mianowski, et al., Acta Phys. Pol. B 41(2010) 449 OTPC S. Mianowski, et al., Acta Phys. Pol. B 41(2010) 449 K. Miernik et al., NIM A 581(2007)194 8He b-delayed particle emission studies with OTPC Exp: M.Borge et al., NPA560(1993)664 β-delayed t (8.00.5)10-3 Theory:L.Grigorenko, N.Shulgina, M.Zhukov, NPA607(1996)277 2009&2010: BGT for rear decay branches a+t+n, 7Li+n and 6He+d Bertram Blank talk A new OTPC detector is under construction at ACCULINNA in collaboration with Warsaw University (OTPC group)

  10. A new in−flight separator ACCULINNA2 ☻ High intensity (~5* pA) and broader variety of beams from U400M cyclotron (*with new ECR)☺ Large acceptance (factor 6,ACC2/ACC) and high energy resolution (LTOF = 38 m vs 21 m)☻ Large experimental area (possibility to have several setups, neutron and gamma array, zero-angle spectrometer)☺ Efficient work with proton-rich RIBvia RF kicker☻ At F3 plane RIB can be transmitted to ISOL line (via extraction gas cell)☺ Wide RIB energy range 6÷60 AMeV ☼ Tritium beam (I~108 pps) and cryogenic tritium target (5*1021 At/cm2)

  11. A new in−flight separator ACCULINNA2 Key pointsi) High precision reaction studies & correlation measurements ii) Combination of ISOL and fragmentation methods Iii) Beam usage concept (continuous usage, one instrument for several experimental areas, wide energy range 6÷60AMeV) Full range of structure and reaction Transfer reactions Resonance elastic scattering Coulomb dissociation Decays: 1p, 2p, b-delayed, g, etc. Fusion-fission near Coulomb Barrier Laser spectroscopy Astrophysical research Direct measurements - (p,p’), (a,a’), resonance scattering Decays via beam stopping “Trojan horse” methods - transfer reactions Inverse kinematics reaction measurements, coulex

  12. structure of neutron rich nuclei 10,12He, 14Be, 18C, 26,28O etc with the use of cryogenic tritium target and 36S & 48Ca intensive primary beams for RIB production • one and two proton decays 12O, 16,17Ne, 26S etc using the modern technique (OTPC, vertex method, zero-degree geometry and others) and RF-kicker for RIB purification • structure of neutron rich nuclei 10,12He, 14Be, 18C, 26,28O etc with the use of cryogenic tritium target and 36S & 48Ca intensive primary beams for RIB production b) a) ‘Ecological niche’ for the ACCULINNA−2 Nuclei laying at the neutron and proton drip-lines in the area of light nuclei can be studied.

  13. Characteristics of the existing and new in-flight RIB separators (DW and Dp/p are angular and momentum acceptances, Rp/Dp is the first-order momentum resolution when 1 mm object size is assumed)

  14. Main technical issues F5:Achromatic focus final image Dx~3.2cm, Dy~2.2cm Envelopes of the RIB in X, Y planes for a 2x2 mm2 primary beam spot in F1. Solid and dashed lines (1, 2) are for momentum acceptance Dp/p=2.5% & 1.0% respectively, curves (3, 4) show a joint action of the RF-kicker when it is on.

  15. Main technical issues

  16. Estimations for ACC−2 and upgraded ISOL complex

  17. Status of project 1) Letter of Intent (60 pages) 2) Calculation of ion−optical system 3) Preliminary cost estimations (~6 M$) 4) TDR preparation & looking for producer BudkerInstitute of NuclearPhysics, ScientificResearch Inst. of Electrophysical Apparatus SIGMAPHI, Magnets and Beam Transport Mitsubishi Electric Corporation Tokin Machinary Corporation; Sumitomo Heavy Industries ltd. - canceled http://aculina.jinr.ru -> publications

  18. Summary •  The RIB research at FLNR−JINR−Dubna is certainly exist • ACCULINNA-2 could provide an ambition to make FLNR famous in the world not only for SHE studies • There are certain unique experimental opportunities and theoretical background at FLNR, people are welcome with ideas • The ACCULINNA group is actively participating in R3B@FAIR (ACC-2 or R2B is seen as a low energy part of it) ⇒ common scientific program, equipment, instrumentation etc  Collaborations with MSU, GANIL, RIKEN and other Institutes are foreseen and welcome

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