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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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slide1

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,

slide2

content

1. Study of Transactinides by rotating wheel.

2. Preparation of Gas-chemistry for SHE.

slide3

Partial chart of nuclide

?

?

243Am( 26Mg , 4n) 265Bh

241Am( 22Ne , 4n) 259Db

slide4

SFC: Sector Focusing Cyclotron, HIRFL

Energy constant: K ~ 70 (Ek~6-7MeV/A)

Intensity: ~ 3×1013 pps (C-Ne)

~ 5×1012 pps (Mg-Ar)

slide5

Hot fusion reaction

Fusion

263Db*

22Ne

241Am

259Db

slide6

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

slide8

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

slide9

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

slide11

-spectrum of the reaction

26Mg +243Am at energy of 168 MeV

slide13

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

slide14

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

slide15

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

slide17

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
slide19

-  correlation events observed

from 243Am(26Mg,3n)266Bh

  • -  correlationenergy window: 8.5-10 MeV

Daughter life-time window: 20-60s

slide20

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

slide24

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

slide26

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.