1 / 37

Recommendations for JINR Nuclear Physics Programme

This document contains the recommendations made by the Programme Advisory Committee for Nuclear Physics for the 31st Meeting on 25-26 January 2010. It covers the JINR budget increase, research programme proposals for 2010-2012, and experimental plans for neutron beam testing and element synthesis.

hedlund
Download Presentation

Recommendations for JINR Nuclear Physics Programme

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. WALTER GREINER RECOMMENDATIONS Programme Advisory Committeefor Nuclear Physics 31st Meeting 25–26 January 2010

  2. Preamble JINR Vice-Director M. Itkis informed the PAC about the Resolution of the 106th session of the Scientific Council (September 2009) and the decisions of the Committee of Plenipotentiaries (November 2009). The PAC is pleased to note the decision of the Committee of Plenipotentiaries (CP) to increase the JINR budget by 20.7% in 2010. The CP also emphasized the importance of the annual increase of the budget in 2010–2016, planned according to the budget forecast approved by the CP, for achieving the milestones of the development strategy for the next seven-year period.

  3. Results of the implementation of the “Programme of the Scientific Research and Development of JINR (2003–2009)” and the JINR Programme of Nuclear Physics Research proposed for 2010–2012 The PAC congratulates the Directorate and the international staff of JINR on the completeand successful realizationof the previous seven-year scientific programme and highly appreciates the valuable contributions to the advancement of science and technology at the world level that have been achieved as part of this programme. The PAC takes note of the report presented by JINR Chief Scientific Secretary N. Russakovich and endorses the proposed main lines of the JINR Programme of Nuclear Physics Research for the period 2010–2012in accordance with the new seven-year JINR development plan.

  4. First Experiments Radiation resistance of the materials Extracted neutron beam parameters testing Neutron Resonance Capture Analysis (NRCA) of elemental/isotopic composition 117mSn production with photonuclear reactions IREN (Источник Резонансных Нейтронов)

  5. IREN-1 parameters by the end of 2009 Accelerated electrons average energy– 30 MeV • Peak current – 2.8A; • Pulse duration – 100 ns; • Repetition rate – 50Hz; • Neutron yield – 81010 n/s

  6. Neutron flux density at 10 m flight path

  7. The PAC heard with interest the report on the first test measurements performed at the improved IREN-1 neutron source. The achieved energy resolution of the facility is good and permits reaching the new higher level of neutron resonance identification. IREN vs IBR-30 (Ta (n,))

  8. IREN 1-st stage outlook for 2010-2016 • 2010 - Upgrade of the RF power system with new klystron. This will result in RF power increase and duplicate electron energy with neutron yield 1012 n/s; • 2011–2012:further upgrade of the RF power system and starting operation with the second accelerating section. This will provide the designed 200 MeV electron energy and beampower about 5.5 kW with neutron yield about 5 1012 n/s; • 2012–2016:upgrade of the klystron modulators in order to reach the designed value of the repetition rate –– 150 Hz. Design and construction of a uranium non-multiplying target. Reaching of the beam power at the level of 10–15 kW and neutron yield at the level of several unitsof 1013 n/s, which will position IREN facility in line with the most intense resonance neutron sources of such type.

  9. The PAC recommends the acceleration of the upgrade of IREN-1 to rapidly reach the higher intensity of the source and to make it really comparablewith powerful neutron sources in Europe. It also recommends that additional funding be provided for supplying the necessary equipment for the next phase of IRENand its full completion as well as for modernization of the experimental instruments. Recommendation

  10. Experiments on the synthesis of element 117

  11. The PAC heard with interest the report on the results of the experiment dedicated to the synthesis ofelement 117 in the 48Ca+249Bk reaction. The PACcongratulates the staff of the Flerov Laboratory on the discovery of element 117 and new isotopes of elements 115, 113, 111, 109, 107, and 105. The discovery of chains of two neighboring isotopes emphasizes the importance of the odd-even and odd-odd effect for such heavy nuclei. It is in fact especially interesting that the odd-odd chain (3n channel) neighboring to the odd-even chain (4n channel) is twice longer (6 α particles). Experiments on the synthesis of element 117 odd-odd odd-even

  12. Production of neutron-rich SHE in low-energy collisions of heavy actinide nuclei Zagrebaev & Greiner, PRC, 2008

  13. Recommendation • The PAC suggests considering, during the modernization phase of the U400 cyclotron complex, the possibility to develop a uranium beam of large intensity (~1012 p/s). This will allow the exploration, in further perspective, of alternative pathways to extend the nuclear chart towards even heavier and longer living nuclei. • The PAC looks forward to furtherdiscussions of the status of the operating basic facilities and of projects of new experimental physics instruments of FLNR at its future meetings.

  14. Status on the MASHA set-up • MAss • Separator of • Heavy • Atoms General ion-optical parameters Range of energy variation, kV 15-40 Range of Br variation, Tm 0.08-0.5 Mass acceptance, % +/-2.8 Angular acceptance, mrad +/-14 Diameter the ion source exit hole, mm 5.0 Horizontal magnification at F1/F2 0.39/0.68 Mass dispersion at F1/F2, mm/% 1.5/39.0 Linear mass resolution at F1 75 Mass resolution at F2 1150 The proposedsetup is a combination of the so-called ISOLmethod of synthesis and separation of radioactivenuclei with the classical method of mass analysis,allowing mass identification of the synthesizednuclides in the wide mass range. PAC for Nuclear Physics, 31st meeting, 25-25 January 2010

  15. Status of the mass-spectrometer MASHA • 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 and first experiments – April of 2010 PAC for Nuclear Physics, 31st meeting, 25-25 January 2010

  16. Status on the MASHA set-up The PAC discussed in detail the current status and prospects of the MASHA spectrometer presented at this meeting. The PAC recognized with interest the plans for developing a gas ion-catcher in addition to the existing ISOL type ion source. Mass spectrum of Kr isotopes: Total efficiency – 47% Mass resolution - 1400 Mass measurement accuracy – 1.3x10-5

  17. First experiments:Start of test and first experiments – April of 2010Mass identification of 112 и 114 elements synthesizedat the reactions242Pu(48Ca,3n)287114(0.5 s, a) –> 283112(4 s, Ea= 9.95 MeV)244Pu(48Ca,3-4n)289114(2.7 s, a9.82 MeV) –> 283112(4 s,Ea= 9.95 MeV)Mass identification of 113elements synthesizedat the reaction243Am(48Ca,3n)288115 (80 ms,E a= 10.5 MeV) ->284113(0.5 s,Ea= 10.0 MeV,(analog of Tallium) Recommendation The PAC strongly supports the intention of the FLNR Directorate to start experiments with the MASHA mass spectrometer in 2010. The PAC recommends the installation of a gas ion-catcher and optimization of its properties for use at the MASHA set-up.

  18. Status report on the GABRIELA set-up • The PAC heard the current status and prospects of the VASSILISSA separator and the GABRIELA set-up (7 Ge detectors and a large number of Si strip detectors), based on the joint JINR-IN2P3 collaboration programme dedicated to the study of nuclear structure and nuclear reaction mechanism of heavy nuclei and superheavy elements. The scientific programme started in 2004, and 5 full-scale experimental campaigns (1 month of beam time per year) were completed with high-intensity beams of 48Ca, 22Ne, and 40Ar. • The ongoing programme will benefit from the upgrade of the VASSILISSA separator started in 2008 from modified Ge detectors with higher multiplicity as well as from the use of actinide targets in asymmetric systems. • The PAC appreciates the considerable progress achieved in the course of modernization of the VASSILISSA separator being performed in close collaboration with IN2P3.

  19. Experimental set-upVASSILISSA + (g,α,b)-detector array Experimental hall of the U400 cyclotron

  20. Experimental methods: Focal plane detector assembly GABRIELA:Gamma Alpha Beta Recoil Investigation with the Electromagnetic Analyser

  21. Summary of results and on-going analysis 50Ti + 208Pb 22Ne + 242 Pu Rf256 Rf257 Lr255 U218 Th216 21

  22. Velocity filter for asymmetric combinations(modernization of VASSILISSA) High transmission for asymmetric combinations (beams of 12C, 14,15N,16,18O, 20,22Ne)  movable plates of electrostatic deflectors Availability for symmetric combinations (136Xe + 136Xe → 272Hs*)  50 cm long plates, high electrostatic field strength For asymmetric combinations – ♦ Increase of the electrostatic deflectors aperture Movable plates

  23. Future plans: Advantage of Dubna => Acces to less neutron-deficient nuclei Present limits ≥ 3 -5 nb for decay ≥ 50 - 100 nb for prompt 78Pt,79Au,80Hg,81Tl,82Pb,83Bi targets – « cold fusion » 90Th, 92U, 94Pu, 95Am, 96Cm targets – « hot fusion » 107 262 Sg 263 Sg 106 105 104 103 102 101 100 146 148 150 152 154 156 158 160

  24. Recommendation The PAC strongly supports the approval of the proposed upgrade of the GABRIELA and VASSILISSA complex with high priority

  25. U400M U400M U400 U400 U200 U200 IC-100 IC-100 DRIBs in Gallery DRIBs in Gallery MT-25 MT-25 Visit to FLNR

  26. The PAC members are grateful to the Directorate of the Flerov Laboratory of Nuclear Reactions for the organization of a visit to the laboratory to see the experimental equipment, in particular the accelerator complexes. Great changes in the appearance were noted in many sections of this laboratory. The good status of the equipment and the good organization of the research at FLNR helped very much the members of the PAC to understand the excellent results produced in the laboratory, demonstrated very recently by the synthesis of the new element 117.

  27. New project DANSSDetector of the Reactor ANtineutrino based on Solid State Plastic Scintillators The PAC heard the proposal on the project DANSSwhose goal is to develop and build a solid scintillator-basedantineutrino detector. The PAC was pleased with the comprehensive presentation and the quality of the proposal description provided well in advance. • Standard 3 GWthreactor (ВВЭР-1000) • Antineutrino yield  1020/s / 4

  28. Detection of the reactor neutrino would allow: Measure the actual reactor power (Nν) Deduce the actual fuel composition (Eν) Weak (ν-e) cross-section On-line reactor monitoring (tomography?) – especially important in view of the future FBR (with longer life-time and less studied) Non-proliferation (prevent unauthorized extraction of 239Pu)

  29. ) . (from 2.6) to 8 MeV 30-50μs Detection idea:Inversed Beta-Decay e+ (n,) The burst spread in space Localburst

  30. Plast. scnt. (µ-shield) CH2+ B (n-shield) Pb (-shield) Segmental solid plastic scintillator (2500 cells) Sensitive volume=1 m3 Cu (carriageframes = -shield) DANSS

  31. Recommendation The PAC strongly recommends the approval of the DANSS project with high priority to be implemented under the theme “Non-accelerator Neutrino Physics and Astrophysics”.

  32. Scientific report “Study of the nuclear fusion reactions in a pt system with the muon catalyzed fusion method” The PAC heard a scientific reporton the theory of muon catalyzed pt fusion. This process was studied extensively at PSI in the 1980s, but thee+e- channel was missed which would clarify the strength of the E0 transition and would shed light on the reaction mechanism of four-body systems.

  33. Possible muon-catalyzed fusion processes in a triple mixture of protium, deuterium and tritium; Cp, Cd, Ct are the respective concentrations, multiplied by the density (relative to liquid hydrogen density, LHD).

  34. Recommendation The PAC recommends the development of an experimental project to study pt fusionby the Mu-CATALYSIS collaboration (JINR Dubna, VNIIEF Sarov, Delft University, INP Cracow, ITEP Moscow).

  35. Poster session The PAC was pleased with the presentations of new interesting results in intermediate energy physics obtained in the ANKE and EDELWEISS experiments and in the theoretical investigations of alpha-cluster and dinuclear models. The PAC congratulates the young physicists for their results, the demonstrated ability to work in top-teams of nuclear physics, and encourages them to continue their activities.

  36. Next meeting of the PAC The next meeting of the PAC for Nuclear Physics will be held on 17–19 June 2010. Its tentative agenda will include: • Reports and recommendations on themes and projects to be completed in 2010 • Consideration of new projects • Poster presentations of new results and proposals by young scientists in the field of nuclear physics research • Reports dedicated to the 70th anniversary of the discovery of spontaneous fission

  37. Thanks for your attention

More Related