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.
10,40; 10,10...
sf; 20% sf; 22%
9,47
sf; (0.3%) 8,79 sf, ? sf;20%
8,37; 8,43 8,86; 8,80
Lr
103
104
Hs Hs 263 ?
?
Bh 262
108
Bh 261
10,38
Sg 262
6,9 ms
Bh11,8 ms?
Sg 261
105
102 ms8 ms
9,70
Rf
Bh 260 ?
Rf 256
6,2 ms
Rf 260
13 ms
Db 259
0,51 s
21 ms
111 ms
107
Sg
106
Db
Sg 258
2,9 ms
4,3 s
sf sf 8,77; 8,87
9,07 9,30; 9,01 8,93 9,04; 9,12
Rf 257 Rf 258 Rf 259
3 s
Db 257 Db 258
4 s
Db 261Db 260
1,5 s 1,8 s
Sg 259 Sg 260
0,48 s 3,6 ms
8,77; 8,87; sf7%
9,10; 9,18; (26%)
9,04; 9,12; /sf?
8,93; sf
9,62...; sf? 9,77; 9,72; sf
9,02; 8,97
2,7 s
10,51-10,57
9,56; 9,52; 9,47
0,45 ms
Hs 264
10.43; sf (50%)
78 s8,30; sf<11%
Rf 261
1,5 s
sf
9,07; 8,97sf (6%)
9,17 sf (13%)
0,76 s
8,2-8,9; (11%); sf1.4%; 117...
9,04; 9,12
Lr 255
21,5 s
9,04; 9,12
Lr 256
25,9 s
9,04; 9,12
Lr 257
0,65 s
9,04; 9,12
Lr 258
3,9 s 8,595; 8,621; 8,565; 8,654 9,04; 9,12
8,43; 8,52; 8,39... 8,77; 8,87
Lr 259
6,3 s 8,445...sf (23%)
10,18; sf<1,4% 9,18; 9,23
9,29 8,83
0,3 s
9,25
sf? sf;3% sf;?
8,03
Lr 261
39 m
~15 min
15,2 s
Bh 266Bh 264
Sg 265
~1 s ?
Rf 262
47 ms? 2,1 s
49 ms
Hs 269Hs 266
2,3 ms870s 1,6 ms 14 s
Hs 265 Hs 267
Sg 263
0.97 s
Bh 267
10,37
Rf 263 ?8,53 sf
Db 263Db 262
34 s 27 s
Sg 266
21 s0,9 s9,06; 9,25; sf
8,72; 8,59; sf82%
8,45; 8,53; 8,67; /sf(33%)
10,51-10,57
9,88; 9,83; 9,75
78 s8,30; sf<11%
4.2 s8,50; sf(40%)
Rf 261
7,4 s8,69-8,94; sf35%
8,36; sf (57%); (3+4
-1%)
9,04; 9,12
Lr 260
3 m
8,77; 8,87
sf? 9,04; 9,12
Lr 262
3,6 h
9,48; 9,62; sf (8%)
?
241Am( 22Ne , 4n) 259Db
?
Partial chart of nuclide
243Am( 26Mg , 4n) 265Bh
Energy constant: K ~ 70 (Ek~6-7MeV/A)
Intensity: ~ 3×1013 pps (C-Ne)
~ 5×1012 pps (Mg-Ar)
SFC: Sector Focusing Cyclotron, HIRFL
22Ne 241Am Fusion 263Db* 259Db
Hot fusion reaction
0.8 µA118 MeV 22Ne5+
Improved Rotating Wheel system
Transportationtime≈ 0.3 s
efficiency ≈ 50%He-NaCl-jet
241Am(910g/cm2)+ Al(1.7mg/cm2)
NaCl
259Db
Recoilchamber
A-1
A-2B
-1C
-1
A-3 B-2
D-1
B-3
D-3
C-2D-2
C-3
259 D
b
-spectrum of the reaction 22Ne +241Am
255 L
r
Decay-curve of 258,259Db and their daughter 254,255Lr
258DbE = 9.08, 9.17, 9.30 MeVT1/2 = 4.3±1.1s
254LrE= 8.46 MeVT1/2= 13.4±4.2s, 258Db T1/2= 4.3±1.4s
241Am(22Ne,4~5n)258,259Db
258Db4.4 s
4n5n
9.179.089.01
9.47
8.468.41
8.378.41
259Db0.5 s
254Lr13 s
255Lr21 s
Z.G. Gan, Z.Qin, H.M. Fan, et al., Eur. Phys. J., A10(2001)21
Rotating Multi-detector Arrays( ROMA)
-spectrum of the reaction 26Mg +243Am at energy of 168 MeV
ParenParentt
11 / keV / keVtt11 / /
msmsDaughtDaught
erer2 2 / /
keVkeVtt22 / /
ms ms
Grand-Grand-daughtdaught
erer3 3 / keV/ keV
tt33 / /
msms
265265BhBh 92689268 17361736 261261DbDb 90069006 48604860265265BhBh 93009300 10151015 261261DbDb 89248924 224224 257257LrLr 89058905 46394639265265BhBh 92199219 574574 261261DbDb 89218921 18981898 257257LrLr 88878887 14051405265265BhBh 92749274 193193 261261DbDb 89188918 58345834265265BhBh 92229222 11401140 261261DbDb 89428942 436436265265BhBh 91799179 19331933 261261DbDb 89028902 15231523265265BhBh 92459245 25472547 261261DbDb 88698869 16081608265265BhBh 91999199 13341334 261261DbDb 89278927 34803480264264BhBh 94409440 555555 260260DbDb 89888988 26862686264264BhBh 95019501 27702770 260260DbDb 90859085 13781378264264BhBh 95249524 12031203 260260DbDb 90039003 259259264264BhBh 94819481 23212321 260260DbDb 90989098 975975
- correlation events observed from 243Am(26Mg,4~5n)264,265Bh
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
264Bh1 s
4n5n
9.489.62 9.24
9.049.079.12
8.93
265Bh0.9 s
260Db1.5 s
261Db1.8 s
257Lr0.65 s
8.868.80
Q = 9.38 MeV
RMF calculation Q = 9.41 MeV
22Ne+249Bk 271Bh*
Berkeley, PRL, 85 (2000)2697
Beam: 300 particle nAEnergy: 117, 123 MeVTime: 62hDose: 4×1017
One Events of 266Bh: E=9.29 MeVlife-time:0.87s
Preliminary!!
278113278113
274Rg274Rg
270Mt270Mt
266Bh266Bh
CNCN
11.68 MeV (PSD)344 μs30.49 mm
11.15 MeV6.149+5.003 (PSD+SSD)9.260 ms30.40 mm
10.03 MeV 1.136+8.894(PSD+SSD)7.163 ms29.79 mm
9.08 MeV (PSD)2.469 s30.91 mm
36.75 MeVTOF 44.61 ns30.33 mm
1st chain
July 23, 2004 18:55 (JST)Morita et al.:JPSJ 73, 2593 (2004).
α
α
α
α
262Db262Db
204.05 MeV(PSD)40.9 s30.25 mm
278113278113
274Rg274Rg
270Mt270Mt
266Bh266Bh
CNCN
11.52 MeV (PSD)4.93 ms30.16 mm
0.88+10.43=11.31 MeV(PSD+SSD)34.3 ms29.61 mm
2.32 MeV (escape)1.63 s29.45 mm
9.77 MeV (PSD)1.31 s29.65 mm
36.47 MeVTOF 45.69 ns30.08 mm
2nd chain
April 2, 2005 2:18 (JST)
Decay chains of 278113
α
α
α
α
262Db262Db
192.32 MeV(PSD)0.787 s30.47 mm
SFSF σ = 39+53-25 fb
209Bi + 70Zn → 278113 + n
115 120 125 130 135 140 145 150 15510-12
10-11
1x10-10
1x10-9
1x10-8
1x10-7
1x10-6
Bh264 Bh265 Bh26626Mg + 243Am
Cro
ss s
ecti
on
(m
b)
Beam Energy (MeV)
HIVAP calculation
Beam energy: 162 MeV Beam energy: 162 MeV 2626MgMg8+8+
Beam intensity: 2 eA
Target: 1.2 mg/cm2 243Am
Transport efficiency: 50%
Detector efficiency: 30%
Stepping time:
Mother Mode:4s, Daughter Mode:60s
Irradiation time: 200h
Experiment condition
8.0 8.5 9.0 9.5 10.00
1
2
3
4
5
6
7
8
9
10
8.4
5 M
eV
262 D
b
9.0
7 M
eV
266 B
h
8.7
8 M
eV
212 P
o
Co
un
ts/1
0 k
eV
Energy (MeV)
-spectrum of the reaction 26Mg +243Am at energy of 162 MeV
- correlation events observed from 243Am(26Mg,3n)266Bh
Event No.
E1/MeV t1/s E2/MeV t2/s E1/MeV t3/s
1 8.989 1.13 8.459 33.62
2 9.128 0.88 8.676 33.84
3 9.071 0.79 8.604 34.14
4 8.959 0.51 8.542 29.23 8.641 5.07
- correlation energy window: 8.5-10 MeVDaughter life-time window: 20-60s
243Am(26Mg,3n)266Bh
266Bh~0.9 s
262Db34 s
258Lr4 s
9.04
8.458.538.67
8.608.628.578.65
LBL RIKEN 1st RIKEN 2nd This work
E(MeV) 9.29 9.08 9.77 9.04
Lifetime (s) 0.87 2.469 1.31 0.9
Decay properties of 266Bh
Comparison of Q value from the experiment with Macro-micro Model
144 146 148 150 152 154 156 158 160 162 164 166 168 1706
7
8
9
10
11
266Bh
259Db and 265Bh
I. Muntian, S. Hofmann, Z. Patyk and A. Sobiczewski Acta Physica Polonica B34(2003)2073
LrNo
Rf
DbSg
Bh
Q
(MeV
)
Neutron Number
DsDs
H
Li
Na
K
Rb
Cs
Fr Ra Ac
Ba
Sr
Ca
Mg
Be
Sc
Y
La
Ti
Zr
Hf
V
Nb
Ta
Cr
Mo
W
Mn
Tc
Re
Fe
Ru
Os
Co Ni Cu Zn Ga Ge As
Rh Pd Ag Cd In Sn Sb
Ir Pt Au Hg Tl Pb Bi
Rf Db Sg
B C N O F
Al Si P S Cl
Se Br
Te I
Po At87 88 89 104 105 106
55 56 57 72 73 74 75 76 77
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
78 79 80 81 82 83 84 85
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
11 12 13 14 15 16 17
3 4
1
5 6 7 8 9
PeriodicPeriodic Table of Table of thethe ElementsElements1
2
3 4 5 6 7 8 9 10 11 12
13 14 15 16 17
Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr
58
90
59 60 61 62
91 92 93 94
63
95 96 97 98 99 100 101
64 65 66 67 68 69
102 103
70 71
LanthanidesLanthanides
ActinidesActinides
Bh107
Hs
Mt
108
109 110
Rg Rg 111
112
114
- -116
- -
He
Ne
Ar
Kr
Xe
Rn
54
86
36
18
10
2
18
113113
114114
115115
116116
118118
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
On-line gas chemistry Apparatus OLGA-III
Summary
1. Two new isotopes of 259Db and 265Bh were synthesized
2. The known isotope of 266Bh was studied, and E close to the RIKEN first chain.
3. Db gas chemistry is under going.
Thank you for attention
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