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RI Beam Factory Project at RIKEN

RI Beam Factory Project at RIKEN. H.Sakurai RIKEN Nishina Center for Accelerator-based Science. http://www.nishina.riken.jp/. Overview of RIBF facility and physics with exotic nuclei Introduction of Phase-I facility and Experimental programs

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RI Beam Factory Project at RIKEN

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  1. RI Beam Factory Project at RIKEN H.Sakurai RIKEN Nishina Center for Accelerator-based Science http://www.nishina.riken.jp/

  2. Overview of RIBF facility and physics with exotic nuclei • Introduction of Phase-I facility and Experimental programs • Recent achievements and future plan • Summary

  3. RIBF Facility Layout Phase-II Experimental Installations 2007~2010 (plan) Existing facility RIPS SHE GARIS ~100 MeV/u ~5 MeV/u RILAC AVF fRC RRC SRC IRC BigRIPS/ZeroDegree CRIB (CNS) ~10 MeV/u 350-400 MeV/nucleon New facility Phase–I 2007- SRC + BigRIPS/ZeroDegree 440 M$ (1$=100JPY) 350 MeV/nucleon up to U 1st beam in 2006

  4. Exploration of the limits of nuclear existence - towards the drip-lines - 3rd generation of RI beam facility “Fission fragment of U” SRC high energy and intense heavy ion beams upto U 350 – 400 A MeV Goal of intensity 1 p-micro A BigRIPS high acceptance for fission fragments Projectile fragmentation 48Ca, 58Ni, 78Ge, 78Kr, 112Sn, 204, 208Pb, 238U, ... 350~400A MeV proton-rich side neutron-rich A<50 or A>160 limit of production 1 particle/day Fission 238U 350A MeV neutron-rich side 20<Z<60 wide dynamic range 78Ni ~10 particles/sec goal

  5. Phase-II construction 2007-2010 To maximize the potentials of intense RIBs available at RIBF http://rarfaxp.riken.go.jp/RIBF-TAC05/ 60 M$ SCRIT - e-RI collision Wakasugi, Suda et al. SAMURAI - large acceptance Kobayashi et al. Rare RI Ring – mass Ozawa et al. SHARAQ - high resolution Shimoura et al. in 2008 SLOWRI- slow beams Wada et al. RI Spin Lab. at RIPS –pol. RI beam Ueno et al. About 2M $ was approved in FY2007 for the infrastructure, radiation shields, ZeroDegree electronics.

  6. RILAC fRC RRC SRC ZDS IRC BigRIPS Acceleration Flow in RI Beam Production by Narumasa Miyauchi 6

  7. BigRIPS /ZeroDegree Exploration into “Isospin Frontier” toward the drip-lines Reaction study fit for high energy domain 200-300A MeV operated by Kubo group BigRIPS Fragment Separator high acceptance for fission fragments pid for RI beams at the second section ZeroDegree Multi-function BT line pid for ejectiles in inclusive- and semi-exclusive measurement medium resolution (p/dp ~ 2000 – 4000) Experimental set-ups PID section RIB production PID section

  8. Basic parameters of BigRIPS T. Kubo et al. Configuration Two-stage separator First stage Two bends Second stage Four bends Energy degrader Achromatic wedge Quadrupoles Superconducting Angular acceptance Horizontal 80 mr Vertical 100 mr Momentum acceptance 6 % Max. magnetic rigidity 9 Tm Total length 77 m Momentum dispersion* First stage -2.31 m Second stage 3.3 m Momentum resolution**(1st order) First stage 1290 Second stage*** 3300 In-flight fission of 238U at 350 MeV/u ~ 100 mr ~ 10 % * At the mid-focus of the stage. ** Those in the case when a 1 mm beam spot is assumed.

  9. (I) Achromatic: Large acceptance mode Specifications of optical modes Maximum magnetic rigidity = 7.3 Tm Angular acceptance Horizontal = +/-45 mrad, Vertical = +/-30 mard Momentum acceptance = +/-3 % Momentum dispersion = 2.24 cm/% Momentum resolution = (X,P)/(X,X) =1240 (II) Achromatic: High resolution mode Maximum magnetic rigidity = 9.0 Tm Angular acceptance Horizontal = +/-20 mrad, Vertical = +/-30 mard Momentum acceptance = +/-3 % Momentum dispersion = 2.12 cm/% Momentum resolution = (X,P)/(X,X) = 2120 (III) Dispersive spectrometer mode Maximum magnetic rigidity = 9.0 Tm Angular acceptance Horizontal = +/-20 mrad, Vertical = +/-30 mard Momentum acceptance = +/-2 % Momentum dispersion = 4.13 cm/% Momentum resolution = (X,P)/(X,X) = 4130 (IV) Transmission mode

  10. Phase-I programs at BigRIPS/ZeroDegree 2007~ Rare-Isotope Physics Programs Fast RI beam production to search for new isotopes Global survey to search for anomalous regions Specific programs with deuteron beams BigRIPSin-flight production of fast rare-isotope beams Ground state properties and low lying excited states via decay spectroscopy / transmission method: particle stability, T1/2, Qb, sR, Ex.(2+)... Deeply bound pionic states via (d, 3He) at 500 MeV Three-body force via pol. d+p elastic scattering at 700 MeV ZeroDegree multi-function beam line for inclusive/semi-inclusive measurements production of 3rd RI beams Collectivity and matter distribution via in-beam gamma / missing mass spectroscopy One step energy regime 200~300 A MeV B(E2), B(M1), (p,p), (p,p’), Ex....

  11. in-beam gamma spectroscopy missing mass spectroscopy RIBF layout in 2007-2008 (Phase-I layout) b-spectroscopy total reaction cross sections (d,3He) Pol.d+p ZeroDegree Spectrometer Experimental set-ups ZDS: Zero-Degree forward Spectrometer

  12. RI beam intensities at BigRIPS for first two years 2007-2008 Primary beam energy 350AMeV 48Ca (200pnA), 86Kr (100pnA),136Xe (10pnA), 238U(2pnA) Secondary beam energy ~250A MeV Cross sections Fragmentation EPAX-II Fission GSI-data (U+Be), ABRABLA (Coulomb) http://www.nishina.riken.jp/UsersGuide/BigRIPS/intensity.html

  13. Collaboration One of the largest heavy-ion facilities in the Asia/world Open for the world-wide user community International Collaboration Workshop on Experiments at the RIBF 6th-9th November 2006 ~130 participants; ~30 from foreign institutes/universities Presentation and discussion of experimental projects to be done in collaboration To identify common interests To have “show case” for experimental technique, methods, detectors … To establish collaborations To prepare proposals MOU “Creation of the council for China-Japan Research Collaboration on Nuclear Physics” 10th November 2006 19 proposals submitted to PAC Feb.2007 (74% international) France-Japan collaboration will be established soon

  14. Recent achievements / Future plan

  15. Recent achievements 28th Dec. 2006 First Beam 27Al10+ at RIBF-SRC Mar. 2007 12th86Kr31+ beam at 345 A MeV several pnA. 13thFirst Production of RIBs at BigRIPS 23rd First successful acceleration of 238U beam 0.002pnA 27th First production of radioactive isotope beams via a U beam Last week 238U beam 0.02pnA max BigRIPS Commissioning; New isotope 125Pd

  16. First beam accelerated at SRC K2600MeV 16:00 28th Dec., 2006 27Aｌ10+ 345MeV/u

  17. DE First RIB 13th Mar. 2007 N=Z+2 N=Z+1 N=Z+3 86Kr + Be(2mm) at 345 MeV/u Zn Cu Ni Co 54Fe N=Z Fe Mn Cr V Ti 43Sc Sc K Ca Cl Ar P S Si Al TOF (F3-F7) Kubo et al.

  18. PID for isotopes created via a 345 A MeV U beams w/o degrader DE@F7 [MeV] TOF(F3-F7) [ns] Te Xe Mar. 27th, 2007 I Sn (Z=50) Sb 132Sn Cd In Pd 117Rh Ag Ru Rh (Z=45) Mo Zr (Z=40) Tc 104Zr Nb Sr 98Y Y Kr 91Br Rb Se Br (Z=35) Ge 82Ge As Zn (Z=30) Ga 76Zn Ni Cu Co 70Ni Fe T. Kubo et al.

  19. The first test experiment at RIBF 238U86+ 345 MeV/u ～ 1enA on Target Z Bρ: 7.438 Tm Target: Be 7mm Total dose: ~1×1013 Total time: 25.4 hours Z=46 Z A/Q A/Q M.Bernas et a. PLB 331(94)19; PLB 415(97) 111

  20. Discovery of 125Pd 123Pd 119Pd45+ 2.6444(2.6413) 124Pd 122Pd 2.6521(2.6506) 38 counts 122Pd45+ 120Pd45+ 2.6666(2.6648) 41 counts 121Pd45+ 120Pd45+ 123Pd 2.6739(2.6728) 245 counts 125Pd 122Pd 121Pd45+ 2.6888(2.6871) 55 counts Counts 123Pd45+ 124Pd 2.6956(2.6952) 173 counts 122Pd45+ 2.7111(2.708) 16 counts 119Pd45+ 125Pd 2.7174(2.7171) 59 counts 126Pd? 123Pd45+ 2.7333(2.7321) 15 counts A/Q resolution(r.m.s): 0.07% At Z=40 A/Q Cf. 124Pd 19 counts, 125Pd(cand.) 1count at GSI, 1997 PLB 415, 111 (97) total dose ~1x108

  21. Setup for May-2007 Commissioning Double Achromatic PL 0.2mmt PPAC(x,y) x2 Silicon 0.33 mmt x2 for DE NaI for E Clover for isomeric states Setup to search for new isotopes Double Achromatic PL 0.2mmt PPAC(x,y) x2 Mom. Slit Dp/p=2% (Max 6%) W/o Wedge Br TOF Prod. Target Be 7mmt Beam-intensity monitor PL 1mmt x 3 Momentum Dispersive PPAC(x,y) x2

  22. Collaborators RIKEN Nishina Center T. Kubo (Spokesman),T. Ohnishi, K. Yoshida, A. Yoshida, K. Kusaka, N. Fukuda, M. Ohtake, Y.Yanagisawa, H. Takeda, Y. Yamaguchi, N. Aoi, K. Yoneda, H. Otsu, S. Takeuchi, D. Kameda, T. Sugimoto, Y. Kondo, K. Tanaka, H. Scheit, Y. Gono, T. Motobayashi, H.Sakurai OECU, OsakaY. Mizoi Rikkyo Univ.M. Matsushita Univ. of Tokyo H. Suzuki, T. Nakao, H. Kimura Saitama Univ. T. Kuboki, T. Yamaguchi Tsukuba Univ. A. Ozawa, T. Moriguchi, Y. Yasuda Tokyo Inst. Tech. T. Nakamura, T. Nannichi, T. Shimamura, Y. Nakayama GSI H. Geissel, H. Weick ANL J. Nolen NSCL/MSU O.Tarasov, T. Nettleton, D. Bazin, B. Sherrill, D. Morrissey GANIL W.Mittig

  23. Future plan 2007 18th June- Accelerator + BigRIPS Commissioning w/ U beam Sept.(plan) RIBF PAC At the beginning of Oct. ZeroDegree Commissioning Oct.-Nov. MT for approved experiments at the first PAC 2008 Prototype of new linac injector coupled with 28GHz ECR is being installed. Increase of U intensity and decouple bet. SHE and BigRIPS

  24. SUMMARY http://www.nishina.riken.jp/ PAC Feb 2007 19 proposals at BigRIPS/ZD, 74 % International Collaboration Commissioning of Accelerator System and BigRIPS is going smoothly step by step Discovery of new isotope 125Pd Experiments will start in this Oct.-Nov at BigRIPS/ZD. Next PAC this Sep. http://www.nishina.riken.jp/UsersGuide You are welcome Come to RIKEN and see what is going on.

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