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Preparation of gas-chemistry of Dubnium at IMP

Preparation of gas-chemistry of Dubnium at IMP. Z. Qin , J.S. Guo, X.L. Wu, H.J.Ding, W.X.Huang, Z.G. Gan, Institute of Modern Physics, Chinese Academy of Sciences,. content. 1. Study of Transactinides by rotating wheel. 2. Preparation of Gas-chemistry for SHE. Partial chart of nuclide. ?.

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Preparation of gas-chemistry of Dubnium at IMP

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  1. Preparation of gas-chemistry of Dubnium at IMP Z. Qin, J.S. Guo, X.L. Wu, H.J.Ding, W.X.Huang, Z.G. Gan, Institute of Modern Physics, Chinese Academy of Sciences,

  2. content 1. Study of Transactinides by rotating wheel. 2. Preparation of Gas-chemistry for SHE.

  3. Partial chart of nuclide ? ? 243Am( 26Mg , 4n) 265Bh 241Am( 22Ne , 4n) 259Db

  4. SFC: Sector Focusing Cyclotron, HIRFL Energy constant: K ~ 70 (Ek~6-7MeV/A) Intensity: ~ 3×1013 pps (C-Ne) ~ 5×1012 pps (Mg-Ar)

  5. Hot fusion reaction Fusion 263Db* 22Ne 241Am 259Db

  6. 259Db Recoil chamber 0.8 µA 118 MeV 22Ne5+ B-3 A-1 D-3 C-1 B-1 C-3 241Am(910g/cm2) +Al(1.7mg/cm2) A-2 D-1 C-2 A-3 B-2 D-2 Improved Rotating Wheelsystem NaCl Transportation time≈0.3 s efficiency ≈50% He-NaCl-jet

  7. -spectrum of the reaction 22Ne +241Am 259Db 255Lr

  8. Decay-curve of 258,259Db and their daughter 254,255Lr 258Db E = 9.08, 9.17, 9.30 MeV T1/2 = 4.3±1.1s 254Lr E= 8.46 MeV T1/2= 13.4±4.2s, 258Db T1/2= 4.3±1.4s

  9. 241Am(22Ne,4~5n)258,259Db 4n 5n 258Db 4.4 s 259Db 0.5 s 9.17 9.08 9.01 9.47 254Lr 13 s 255Lr 21 s 8.37 8.41 8.46 8.41 Z.G. Gan, Z.Qin, H.M. Fan, et al., Eur. Phys. J., A10(2001)21

  10. Rotating Multi-detector Arrays( ROMA)

  11. -spectrum of the reaction 26Mg +243Am at energy of 168 MeV

  12.  -  correlation events observed from 243Am(26Mg,4~5n)264,265Bh

  13. 4n 5n Q = 9.38 MeV RMF calculation Q = 9.41 MeV 264Bh 1 s 265Bh 0.9 s 9.48 9.62 9.24 260Db 1.5 s 261Db 1.8 s 8.93 9.04 9.07 9.12 257Lr 0.65 s 8.86 8.80 243Am(26Mg,4~5n)264,265Bh Z.G. Gan, J.S.Guo, X.L.Wu, Z.Qin, et al., Eur. Phys. J., A20(2004)385

  14. 22Ne+249Bk 271Bh* Beam: 300 particle nA Energy: 117, 123 MeV Time: 62h Dose: 4×1017 One Eventsof 266Bh: E=9.29 MeV life-time:0.87s Berkeley, PRL, 85 (2000)2697

  15. Decay chains of 278113 36.75 MeV TOF 44.61 ns 30.33 mm 36.47 MeV TOF 45.69 ns 30.08 mm 1st chain July 23, 2004 18:55 (JST) Morita et al.:JPSJ 73, 2593 (2004). 278113 CN 278113 CN α α 11.68 MeV (PSD) 344　μs 30.49 mm 11.52 MeV (PSD) 4.93　ms 30.16 mm 274Rg 274Rg α α 11.15 MeV 6.149+5.003 (PSD+SSD) 9.260 ms 30.40 mm 0.88+10.43=11.31 MeV (PSD+SSD) 34.3 ms 29.61 mm Preliminary!! 270Mt 270Mt α α 10.03 MeV 1.136+8.894(PSD+SSD) 7.163 ms 29.79 mm 2.32 MeV (escape) 1.63 s 29.45 mm 266Bh 266Bh α α 2nd chain April 2, 2005 2:18 (JST) 9.08 MeV (PSD) 2.469 s 30.91 mm 9.77 MeV (PSD) 1.31 s 29.65 mm 262Db 262Db 204.05 MeV(PSD) 40.9 s 30.25 mm 192.32 MeV(PSD) 0.787 s 30.47 mm σ = 39+53-25 fb SF SF 209Bi + 70Zn → 278113 + n

  16. HIVAP calculation

  17. Experiment condition • Beam energy: 162 MeV 26Mg8+ • Beam intensity: 2 eA • Target: 1.2 mg/cm2243Am • Transport efficiency: 50% • Detector efficiency: 30% • Stepping time: Mother Mode:4s, Daughter Mode:60s • Irradiation time: 200h

  18. -spectrum of the reaction26Mg +243Am at energy of 162 MeV

  19. -  correlation events observed from 243Am(26Mg,3n)266Bh • -  correlationenergy window: 8.5-10 MeV Daughter life-time window: 20-60s

  20. 266Bh ~0.9 s 9.04 262Db 34 s 8.45 8.53 8.67 258Lr 4 s 243Am(26Mg,3n)266Bh 8.60 8.62 8.57 8.65

  21. Decay properties of 266Bh

  22. Comparison of Q value from the experiment with Macro-micro Model

  23. Production of Dubnium: 243Am( 20Ne, 4~5n)258, 259Db 258Db: T1/2 = 4.4s, E = 9.17, 9.08, 9.01 MeV Carrier gas: He/KBr Reaction gas: HBr Gas-chemistry: OLGA-III Detection: Rotating wheel system

  24. On-line gas chemistry Apparatus OLGA-III

  25. Summary • 1. Two new isotopes of 259Db and 265Bh were synthesized • The known isotope of 266Bh was studied, and E close • to the RIKEN first chain. • 3. Db gas chemistry is under going.

  26. Thank you for attention

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