1 / 50

Workshop on The Future of Superheavy Element Research February 17 - 18, 2004

Workshop on The Future of Superheavy Element Research February 17 - 18, 2004 Gesellschaft f ü r Schwerionenforschung Darmstadt, Germany. One End of Nuclear Chart. 116. 176. 115. 209 Bi + 70 Zn →. 114. 209 Bi + 64 Ni → 272 111 + n. 113. 208 Pb + 64 Ni → 271 Ds + n. 112. 111. Ds.

hanne
Download Presentation

Workshop on The Future of Superheavy Element Research February 17 - 18, 2004

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. Workshop on The FutureofSuperheavy Element Research February 17 - 18, 2004 Gesellschaft für SchwerionenforschungDarmstadt, Germany

  2. One End of Nuclear Chart 116 176 115 209Bi + 70Zn → 114 209Bi + 64Ni → 272111 + n 113 208Pb + 64Ni → 271Ds + n 112 111 Ds Mt 170 Hs Bh Sg Db Rf 162 Lr No Md a Fm SF Es b+ or EC Cf b- 152

  3. CSM Dec. Tank CSMAcc. Tanks RILAC Acc. Tanks RFQ-Linac GARIS 18GHz ECR Ion Source RILAC Facility

  4. Gas-filled recoil separator （気体充填型反跳分離装置） 差動排気システム Heガスの領域 入射ビーム 入射ビームの軌道 Heガス導入 ビームストッパー（Ta） マイラフォイル 回転式標的 弾性散乱による ビーム強度モニター 半導体検出器 　（真空領域） D1 Q1 Q2 D2 目的とするイオンの軌道 (m) 0 1 2 RIKEN

  5. PSD SSD box MCP2 ions MCP1 Focal Plane Detectors

  6. New Rotating Target f = 300 mm, w = 2000 rpm cf. old one f = 125 mm, w = 1000 rpm Tested with 1pmA 86Kr beam

  7. 20 208Pb 18 209Bi Bohr’s theorem 16 169Tm 14 198At 271110 208Pb 12 272111 qeq 265Hs 209Bi 212Ac 10 192Bi 203Fr 8 208Pb 204Fr 234Bk 254No 6 255Lr 245Fm 209Bi 4 30 5 25 20 15 10 v0: Bohr velocity (v/v0)Z1/3

  8. projectile target recoil compound nucleus energy separator velocity separator gas-filled separator

  9. 271110 272110 a1 208Pb + 64Ni → 271Ds + n 267Hs a2 263Sg a3 259Rf a4 255No a5 255Md 251Fm

  10. 5 5 5 5 5 0 0 0 0 0 a b t=2.9ms t=120ms 5 a1 a1 0 11 5 1000s 1ms 0.1s 10s 8 9 t=77ms a2 a2 0 5 1000s 1ms 0.1s 10s 8 9 10 11 Counts/bin t=1.0s a3 a3 Counts/100keV 0 5 1000s 1ms 0.1s 10s 8 9 10 11 t=3.7s a4 a4 0 5 1000s 1ms 0.1s 10s 8 9 10 11 t=220s a5 a5 0 1000s 10ms 1ms 0.1s 10s 7 8 9 10 11 Ea (MeV) Tdecay

  11. Summary of 208Pb + 64Ni → 271110 + n reaction

  12. 272111 273111 a1 (14) 209Bi + 64Ni → 272111 + n 268Mt a2 (14) 264Bh a3 (12) SF (2) 260Db a4 (11) SF (1) 256Lr a5 256No a5 252Md

  13. 272111 273111 a1 (14) 209Bi + 64Ni → 272111 + n 268Mt a2 (14) 264Bh a3 (12) 264Sg 260Db a4 (11) 260Rf SF (2) 256Lr a5 SF (1) 256No a5 252Md possibility not excluded experimentally

  14. 5 5 0 0 5 5 0 0 Counts / 100 keV 5 5 Counts / bin 0 0 5 5 0 0 E / MeV α 254Md ← 256Lr ← 260Db ← 264Bh ← 268Mt ← 272111 t=5.5ms a1 a1 a2 a2 t=30ms a3 t=1.3s a3 a4 a4 t=8.2s 5 5 a5 a5 t=26s 0 0 8 9 10 11 12 100ms 10ms 1s 100s 10000s Tdecay

  15. Summary of 209Bi + 64Ni → 272111 + n reaction

  16. Summary of 209Bi + 70Zn experiment period 9/5/2003 ～ 12/29/2003 Beam Energy 5.03 AMeV 348 MeV at target half depth Total Dose 1.21x1019 Target Thickness 1.37x1018 /cm2 (0.48 mg/cm2) e_GARIS 0.8 (assumption) s(1-ev.) 7.5x10-38 cm2 upper limit (1s) 1.38x10-37 cm2 Irradiation time 1390 Hours (58 Days / 74 Days) Beam Intensity 2.42x1012 /s (0.4 p-mA)

  17. 208Pb,209Bi(HI,1n) reaction 1mb 100nb 10nb 1nb 100pb 10pb 1pb present work 0.1pb 102 104 106 108 110 112 114 100 Atomic Number

  18. K. Morimoto RIKEN D. Kaji CNS H. Haba RIKEN E. Ideguchi RIKEN R. Kanumgo RIKEN K. Katori RIKEN H. Koura RIKEN T. Ohnishi RIKEN A. Ozawa RIKEN T. Suda RIKEN I. Tanihata RIKEN A. Yoneda RIKEN A. Yoshida RIKEN H. Kudo Niigata U. K. Sueki Univ. of Tsukuba F. Tokanai Yamagata U. H. Xu IMP Lanzhou Y.-L. Zhao IHEP Beijing T. Zeng Peking U. A. V. Yeremin FLNR JINR J. Peter Caen/GANIL

  19. February 17, 2004 FEST COLLOQUIUM： On the Occasion of Sigurd Hofmann’s 60th Birthday What Do We Know about SHE - Expectations and Reality Yuri Oganessian February 18, 2004 Chair: Gottfried Münzenberg Welcome Walter Henning Theory of Superheavy Nuclei: Old and New - Open Problems Walter Greiner Chemistry of Spherical Superheavy Elements - The Road to Success Heinz Gäggeler Superheavy Element Research at Berkeley Ken Gregorich Possibilities of the RF Nuclear Center Arzamas-16´ in Producing Pure Actinide Isotopes for Science and Applications Stanislav Vesnovskii In Beam Studies of SHE at High Beam Intensities Matti Leino Superheavy-Element Experiments at RIKEN Kosuke Morita Studies of SHE at GANIL Christelle Stodel Heavy Element Research at IMP Lanzhou Wenlong Zhan Heavy Element Research with Laser Spectroscopy and Buffer Gas Traps Hartmut Backe Efficient Production of Intensive Beams of Rare Isotopes Georgy Gulbekian Steps towards an Optimized Linac for SHE Production at GSI Ulrich Ratzinger Studies of SHE at High Beam Intensities Sigurd Hofmann Closing Remarks Walter Henning

  20. GSI SHIP

  21. JINR/FLNR DUBNA Gas-Filled Separator

  22. JINR/FLNR DUBNA

  23. LBNL BGS

  24. GANIL LISE (Wien Filter)

  25. Z=110に対する計算値

  26. 2004年1月9日於京都大学理学部物理学第二教室 qeq (v/v0)Z1/3

  27. 169Tm(40Ar,5n)204Fr 169Tm(40Ar,6n)203Fr 169Tm(48Ca,5n)212Ac 208Pb(40Ar,3n)245Fm 208Pb(48Ca,2n)254No 209Bi(48Ca,2n)255Lr 140Ce(58Fe,p5n)192Bi 140Ce(64Ni,p5n)198At 208Pb(58Fe,n)265Hs 208Pb(64Ni,n)271110 209Bi(64Ni,n)272111 113 112 111 110 Mt Hs Bh Sg Db Rf Lr No Md Fm Es Cf Bk Cm Am Pu Np U Pa Th Ac Ra Fr Rn At Po Bi Pb

  28. Transmission v/v0

  29. Experimental conditions Beam 64Ni 0.4～1 pmA Total dose 4.0 x 1018 Target 208Pb 190～250 mg/cm2 (98% enriched) evaporated on 30 mg/cm2 C covered by 10 mg/cm2 C Br (GARIS) 2.05 Tm P (GARIS) 75 Pa Counting rate 10～20 cps

  30. 2004年1月9日於京都大学理学部物理学第二教室 Summary of the measurement in year 2002. 208Pb(64Ni,n)271110 reaction Total 40 4.0 14 Ein :energy from the accelerator. Tav: average target thickness

  31. 103 102 10 1 10-1 Tdecay (s) a1 a2 10-2 a3 10-3 a4 a5 10-4 10-5 8 7 9 10 11 Ea (MeV)

  32. 208Pb + 64Ni → 271110 + n errors statistical (1s) RIKEN GSI s (pb) energy loss in the target E(64Ni) /MeV

  33. Experimental conditions Beam 64Ni 0.7～1.8 pmA Total dose 1.30 x 1019 Target 209Bi 210～310 mg/cm2 evaporated on 30 mg/cm2 C covered by 10 mg/cm2 C Br (GARIS) 2.05 Tm P (GARIS) 75 Pa Counting rate 2～10 cps

  34. Summary of the measurement in year 2003. 209Bi(64Ni,n)272111 reaction Total 50 12.6 14 Ein :energy from the accelerator. Tav: average target thickness

  35. a a a a a a a a a a a a a a a 17-Feb-2003 17-Feb-2003 CN CN 272111 272111 4.4 ms 11.04 MeV (PSD) 11.0 ms 11.08 MeV (PSD+SSD) 268Mt 268Mt CN 272111 13.0 ms 10.68 MeV (PSD) 9.2 ms 10.36 MeV (PSD) 14.9 ms 11.56 MeV (PSD+SSD) 264Bh 264Bh 268Mt 1.45 s 9.60 MeV (PSD) 1.38 s 9.81 MeV (PSD+SSD) 122 ms 1.12 MeV (PSD) escape 260Db 260Db 264Bh 1.93 s 9.17 MeV (PSD+SSD) 10.88 s 9.05 MeV (PSD) 21.8 ms 9.85 MeV (PSD) 256Lr 256Lr 260Db 21.9 s 8.37 MeV (PSD) 11.9 s 8.39 MeV (PSD+SSD) 0.51 s 9.34 MeV (PSD) 252Md 252Md 256Lr 33.5 s 8.65 MeV (PSD) 20-Feb-2003 252Md 209Bi(64Ni,n)272111 Eproj=323MeV 1st 2nd 3rd

  36. a a a a a a a a a a a 26-Feb-2003 CN 272111 1.42 ms 11.25 MeV (PSD) 209Bi(64Ni,n)272111 Eproj=323MeV 268Mt 36.6 ms 10.43 MeV (PSD+SSD) 26-Feb-2003 CN 272111 264Bh 4th 7.11 ms 10.82 MeV (PSD+SSD) 1.87 s 9.66 MeV (PSD+SSD) 268Mt 260Db 0.715 ms 10.28 MeV (PSD) 1.52 s 9.40 MeV (PSD) CN 272111 264Bh 256Lr 2.82 ms 11.31 MeV (LG) 0.54 s 9.57 MeV (PSD) 268Mt 260Db 44 ms 10.78 MeV (PSD+SSD) S.F. 264Bh 1.71 s 231 MeV (PSD+SSD) 0.44 s 9.58 MeV (PSD) 260Db 5th 48.46 s 8.81 MeV (PSD) 6th 256Lr 8-Apr-2003

  37. a a a a a a a a a a a a 14-Apr-2003 CN 272111 1.17 ms 10.58 MeV (LG) 268Mt CN 272111 38.33 ms 10.35 MeV (PSD) 5.11 ms 11.06 MeV (PSD) 264Bh 268Mt 3.6 ms 9.31 MeV (PSD) 19.1 ms 10.43 MeV (PSD) 260Db 264Bh 4.87 s 9.01 MeV (PSD) 1.34 s 9.50 MeV (PSD) 256Lr 260Db 45.84 s 8.50 MeV (PSD) 3.69 s 9.10 MeV (PSD) 252Md 256Lr 7.87 s 8.41 MeV (PSD) 16-Apr-2003 252Md 209Bi(64Ni,n)272111 Eproj=323MeV 15-Apr-2003 CN 272111 7th 8.89 ms 10.96 MeV (PSD+SSD) 268Mt 26.18 ms 2.76 MeV (PSD)esc 264Bh S.F. 0.97 s 208 MeV (PSD) 8th 9th

  38. CN 272111 1.0 ms 10.21 MeV (PSD) 268Mt a a a a a a a a a a a 8.8 ms 10.03 MeV (PSD+SSD) 264Bh S.F. 4.93 s 206 MeV (PSD+SSD) CN 272111 6.92 ms 11.00 MeV (PSD+SSD) 268Mt 35.5 ms 10.58 MeV (PSD) 264Bh 1.0 s 9.85 MeV (PSD) 260Db 1.14 s 9.14 MeV (PSD) 256Lr 38.62 s 8.47 MeV (PSD+SSD) 5-May-2003 252Md 30-Apr-2003 209Bi(64Ni,n)272111 Eproj=320MeV 5-May-2003 CN 272111 0.77 ms 10.85 MeV (PSD+SSD) 268Mt 32.4 ms 10.34 MeV (PSD) 264Bh 1.91 s 8.87 MeV (PSD+SSD) 10th 260Db 21.04 s 8.503 MeV (PSD) 256Lr 11th 12th

  39. a a a a a a a a a CN 272111 6.84 ms 11.01 MeV (PSD+SSD) 12-May-2003 CN 272111 268Mt 4.5 ms 11.08 MeV (PSD+SSD) 37.2 ms 9.40 MeV (PSD) 268Mt 264Bh 3.35 ms 10.28 MeV (PSD) 1.23 s 9.56 MeV (PSD+SSD) 264Bh 260Db 0.81 s 9.63 MeV (PSD) 0.33 s 8.29MeV (PSD+SSD) 260Db 256Lr 2.42s 9.131 MeV (PSD+SSD) 256Lr 6.85 s 8.63 MeV (PSD) 252Md 8-May-2003 209Bi(64Ni,n)272111 Eproj=323MeV 13th 14th

  40. 254Md ← 256Lr ← 260Db ← 264Bh ← 268Mt ← 272111 102 a1 10 a2 a3 1 a4 a5 Tdecay (s) 10-1 10-2 10-3 10-4 9.0 10.0 12.0 8.0 11.0 Ea (MeV)

  41. Optimum excitation energies for 1n evaporation channel

  42. RARF_PAC 02Jul2003 140Ce + 64Ni evaporation residues 209Bi + 64Ni transfer products to GARIS 64Ni 199At 6.643 MeV p4n evap. 400 196Po 6.520 MeV a4n evap. 209Bi Nat.Ce 212mAt 7.837,7.897 MeV 2pn transfer 300 211Po 7.450 MeV pn transfer 213Rn 8.088 MeV 3pn transfer 197Po 6.281 MeV a3n evap. 212At 7.679 MeV 2pn transfer 213Fr 6.775 MeV 4p transfer 200 Counts/10keV 197mPo 6.383 MeV 214mFr 8.546, 8.478 MeV 4pn transfer 211mPo 7.275 MeV pn transfer 214Fr 8.426 MeV 4pn transfer 198Po 6.182 MeV 200Po 5.862 MeV 100 199Po 6.058 MeV system check & energy calibration 0 7.5 6.0 7.0 8.0 5.5 6.5 9.5 8.5 Ea (MeV)

More Related