Perspectives of the superheavy element chemistry at RIKEN GARIS
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1 Perspectives of the superheavy element chemistry at RIKEN GARIS Nishina Center, RIKEN Hiromitsu Haba CONTENTS 1. Present status of SHE chemistry at RIKEN GARIS 2. Future plans 2.1. Production of SHE nuclides for chemical experiments 2.2. New chemistry apparatus 3. Summary
2 1. Present status of SHE chemistry at RIKEN GARIS Development of the gas-jet transport system coupled to GARIS Startup of the SHE chemistry in RIKEN RIKEN GARIS Rotating target Beam from RILAC Evaporation Residues Focal plane (ERs) Beam dump Gas inlet Elastic scattering beam monitor D1 Q1 Q2 D2 Gas-jet transport system Mylar window ERs 88 Pa He/KCl 90 kpa Rotating wheel system, MANON Gas out Manometer 0 50 mm 4 m Model experiments 169 Tm( 40 Ar,3n) 206 Fr (15.9 s) 208 Pb( 40 Ar,3n) 245 Fm (4.2 s) 238 U( 22 Ne,5n) 255 No (3.1 min) Si PIN photodiodes Mylar foil (0.68 μm)
3 Model experiments of the GARIS/gas-jet system 206 Fr 245 Fm 255 No Reaction 169 Tm( 40 Ar,3n ) 208 Pb( 40 Ar,3n ) 238 U( 22 Ne,5n ) Cross section 376 µb 1) 15 nb 2) 90 nb 3) Beam energy (MeV) Recoil energy (MeV) Beam intensity (pµa) Target (µg/cm 2 ) 120 (Tm) 420 (Pb) 310 (U 3 O 8 ) Target backing (µg/cm 2 ) 30 (C) 30 (C) 1270 (Ti) Magnetic rigidity (Tm) He pressure (Pa) Mylar window (µm) Support grid (%) Gas-jet eff. (%) 88 ± 4 83 ± 9 84 ± 9 GARIS eff. (%) - 43 ± 4 5 ± 1 1) D. Vermeulen et al.: Z. Phys. A 318, 157 (1984). 2) J. M. Nitschke et al.: Nucl. Phys. A313, 236 (1980). 3) This work
4 2. Future plans 2.1. Production of SHE nuclides for chemical experiments (a) 238 U target Z = U + 26 Mg 259 Rf + 5n: Oct. 8 10, 2007 Acceleration of the 26 Mg beam at RILAC (~2 pμa) Production and gas-jet transport of 259 Rf (T 1/2 = 3.0 s) Optimization of the setting parameters of GARIS and the gas-jet system 238 U + 26 Mg 261 Rf (T 1/2 = 78 s) + 3n? Background in α-spectrometry at the new chemistry laboratory 30 cm Rotating 238 U target MgO rod for 18 GHz ECR ion source
5 Chemistry laboratory for the SHE chemistry Background level: ~1/100 of that in the target room Chemistry laboratory Focal plane of GARIS Gas-jet MANON SHEs Target room Chemistry laboratory 0 5 [m]
6 (b) Cm target and GARIS II Great advantage for future SHE chemistry!! Year Cm material (~7 mg ) Target system R&D Chem. GARIS GARIS II R&D Present Chem. GARIS II GARIS/gas-jet setting parameters, decay properties, and excitation functions Z = 104 Cm + 18 O 261 Rf + 5n Z = 105 Cm + 19 F 262,263 Db + 5;4n Z = 106 Cm + 22 Ne 265,266 Sg + 5;4n Z = 107 Cm + 23 Na 266,267 Bh + 5;4n? Z = 108 Cm + 26 Mg 269,270 Hs + 5;4n Z = 109 Cm + 27 Al 270,271 Mt + 5;4n?
7 Yields of SHE nuclides for chemistry experiments (rough estimation) Z σ (pb) Eff. (%) Yield (1/d) Eff. (%) Yield (1/d) Cm( 18 O,5n ) 261 Rf Cm( 19 F,5n ) 262 Db Cm( 22 Ne,5n ) 265 Sg Cm( 23 Na,5n ) 266 Bh 37* Cm( 26 Mg,5n ) 269 Hs GARIS transport efficiency [%] GARIS (5.8 m) GARIS II (3.9 m) Simulated by N. Sato Preliminary! Cm( 27 Al,5n ) 270 Mt 0.71* Assumptions Reaction Target thickness: 300 μg/cm 2 Beam intensity: 5 pμa Gas-jet transport efficiency: 80% * from the σ vs. Z systematics Transport efficiency of GARIS Focal plane size: Φ60mm He pressure: 0.28 torr Length of GARIS II: 3.9 m GARIS I v/v 0 GARIS II x ~3
8 2.2. Chemistry apparatus (a) Micro-chemical chip for ion exchange and solvent extraction Micro flow path on glass or plastic surface Laminar flow of aq. solution and org. solvent Large relative interaction area Short diffusion length Rapid ion exchange and solvent extraction Determination of distribution coefficient Organic solvent (hydrophobic path) LS? α-spectrometry Micro-chemical chip Osaka Univ. Aqueous solution (hydrophilic path) 12 cm 30 mm 0.7 mm 0.7 mm 100 μm 40 μm
9 Experimental setup Gas-jet Aq. solution GARIS/gas-jet system Dissolving unit α/sf measurement system Micro-chemical chip He gas Halogen lamp Si PIN photodiode mm 2 32 (up/down each 2 rows) Ti tapes (~10 μm) Org. solvent
10 (b) Gas chromatograph column coupled to GARIS Primary beam Focal plane GARIS D1 Q1 Q2 D2 Chemical reagents without aerosols Mylar window SHE atoms GARIS Teflon Complexation Oven Quartz Water cooling Oven OLGA-type column MANON Thermostat LN 2 COLD-type column
11 3. Summary Present status of SHE chemistry at RIKEN GARIS Development of a gas-jet transport system coupled to GARIS Model experiments 169 Tm( 40 Ar,3n) 206 Fr, 208 Pb( 40 Ar,3n) 245 Fm, and 238 U( 22 Ne,5n) 255 No Future plans (a) Production of SHE nuclides for chemical experiments 238 U( 26 Mg,5n) 259 Rf on Oct. 8 10, 2007 Cm target (end of 2008) and GARIS II (end of 2009) (b) New chemistry apparatus Micro-chemical chip for ion exchange and solvent extraction Gas chromatograph column coupled to GARIS The 2 nd Workshop on SHE RIKEN in the end of 2007 What chemistries should be studied at RIKEN GARIS?
12 Collaborators RIKEN T. Akiyama, H. Haba, T. Ichikawa, S. Ito, D. Kaji, K. Katori, H. Kikunaga, K. Morimoto, K. Morita, R. Nomura, N. Sato, H. Watanabe, and A. Yoneda JAEA M. Asai, Y. Ishii, Y. Kasamatsu, H. Koura, Y. Nagame, T. Sato, H. Tome, and A. Toyoshima Osaka Univ. Y. Komori, R. Nakagaki, K. Ninomiya, K. Ooe, A. Shinohara, N. Takahashi, W. Yahagi, and T. Yoshimura Niigata Univ. S. Goto, T. Hasegawa, T. Kawasaki, and H. Kudo Kanazawa Univ. M. Araki, T. Nanri, and A. Yokoyama Tohoku Univ. T. Otsuki, K. Ozeki, and T. Shinozuka Tokyo Metropolitan Univ. K. Akiyama and Y. Oura Univ. Tokushima M. Sakama Univ. Tsukuba K. Sueki Tokyo Univ. E. Ideguchi Konan Univ. T. Wada Thank you very much! Participants in the 1st Workshop on SHE RIKEN (27 Aug. 2007)
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