Study of the complete-fusion reaction Study of the complete-fusion reaction 226226Ra+Ra+4848CaCaVoinov A.A.Voinov A.A. on behalf of the FLNR, LLNL, TUM, INS Vinca collaboration on behalf of the FLNR, LLNL, TUM, INS Vinca collaboration

1010thth International Spring Seminar on Nuclear Physics New Quests in Nuclear Structure, Vietri Sul Mare, May 21-25, 2010 International Spring Seminar on Nuclear Physics New Quests in Nuclear Structure, Vietri Sul Mare, May 21-25, 2010

Rg

112

113

114

117

115

118

116

160 162 164 166 168 170 172 174 176 178 180 182 184152 158156154

0.03 ms ?

10.92

1.7 msMt 266

8.70

17 s

34 s 27 sDb 262 Db 263

Sg 265

1.6 sDb 256

1.5 sDb 260Db 257

1.5 s

4.0 sRf 26021 ms

Rf 2613.3 s 68 s

Rf 2620.2 s

Rf 2593.0 s

Rf 2566.2 ms

Rf 25812 ms

Rf 257

0.50 0.50 f

a9.81 (.18)9.76 (.64)9.72 (.18)

Sg 2603.6 ms

9.56 (.60)9.52 (.27)9.47 (.13)

Sg 2610.23 s

9.25

Sg 2639.62 (.78)9.36 (.11)9.03 (.11)

Sg 2590.48 s

Bh 264440 ms

9.48 9.62

Bh

HsMtDs Ds 267

11.6

Sg 2582.9 ms

3.1 m

Lr 259

No 258

6.3 s

1.2 ms

Lr 260

No 259

3 m

58 m

Lr 261

No 260

39 m

106 ms

Lr 2583.9 s

Lr 255

No 254

2.1 s

55 s

Lr 254

No 253

13 s

1.7 m

Lr 257

No 256

0.65 s

2.91 sNo 255

10 m 28 m

3.0 d

Md 257

Fm 256

5.52 hMd 258

Fm 257

51 d

100 d

Md 259 Md 260

Fm 258 Fm 259

95 m 31.8 d

0.38 ms 1.5 s

Md 256

Fm 255

77 m

20.1 h

Md 253

Fm 252

6 m

25.4 h

Md 252

Fm 251

2.3 m

5.30 h

Md 255

Fm 254

27 m

3.24 h

Md 254

Fm 253

472 dEs 256

7.6 h 25.4 mEs 254

39.3 h 276 dEs 251

33 hEs 250

8.6 hEs 253

20.5 dEs 252

Cf 2551.4 h

Cf 25612.3 m

Cf 25317.8 d13.1 y

57 m

70 ns

Cf 250Cf 249351 y

Cf 251 Cf 2522.64 y898 y

Cf 25460.5 d

1.6 msDs 271

10.7410.68

Rg 2723.8 ms

10.99

NoMdFmEsCf

150

No

MdFmEsCf

Sg

2.2 h

9.019.129.088.89

Z = 114

Hs 2699.7 s

9.239.189.73

Hs 267

10.3010.37

10.5710.3410.52

0.8 ms2.0 msHs 265

0.45 ms

aaa

a

Ds 270

Hs 266

Sg 262

11.11

Ds 269

Mt 26821 ms

10.33

0.18 ms

112/285

9.152 9 s

A/Z

T1 /2

E (M eV )

E C

-

S F

aa

Hs 275

Ds 279

Sg 271

112/284112/282

114/28710.02

114/288

9.94

116/290

115/288115/287

113/284113/283

Rg 280

Mt 276

Bh 272

Rg 279

Mt 257

Bh 217

116/291

10.84 10.74

9.54

9.30

10.00

10.4610.59

10.12

9.75

9.71

9.02

10.37

10.33

Db 268

7 . 1 m s

3 2 m s 8 7 m s

1 8 m s

0 . 1 0 s

0 . 1 9 s

0 . 1 7 s

0 . 7 2 s

9 . 8 s

2 9 h

9 . 7 m s

0 . 4 8 s

9 7 m s0 . 8 2 m s

3 . 6 s

0 . 2 0 s

1 . 9 m

0 . 4 8 s 0 . 8 0 s0 . 1 3 s

10.19

112/2833 . 8 s

48 238 249Ca + U... Cf

8.54

9.70

2.3 ms

10.18

8 ms

Hs 264

116/2921 8 s

10.66

Bh 266 Bh 2671.7 s 17 s

8.839.08

113/2780.24 ms

11.68

Rg 2746.4 ms

11.15

Mt 2705.0 ms

10.03

Rf 2551.64 s

0.89 ms11.65118/294

116/293

10.546 1 m s

114/286

25.4 h

60.5 d

Db

LrRf

-7

-6

-5

-4

E sh= -3

113/282

10.630 . 0 7 s

Rg 278

10.694 m s

Mt 27410.

0 . 4 s

Bh 2708.931 m

Db 2662 0 m

Db 2671 . 2 h

114/289

9.822 . 6 s

112/285

9.152 9 s

Ds 28111 s

Rf 2671 . 3 h

10.7110.44

69 ms0.1 ms

11.0312.1511.15

6 ms

Hs 2707.6 s

9.028.88

52 ms0.8 s

9.8810.43

37 msSg 264

9.06

0.9 s0.3 s

10.40 10.10 10.03

Bh 26111.8 ms

10.3710.24

10.06 9.91 9.74

8.0 ms102 msBh 262

39.3 hEs 255

39.8 dEs 257

7.8 d

2. 63 h

16.4 s 27 sLr 256

No 25724.5 s

0.8 s

9.163

3.9 s

4.3 sDb 258 Db 259

0.51 sDb 261

1.8 s

N e utron num b er

Chart of nuclides

Pro

ton

nu

mb

er

9.7

1 minDb 269

10 hDb 270

0.3 sSg 266

Lr 2623.6 h

No 2625 ms

112/2770.69 ms

11.4311.16

Ds 2730.17 ms

11.2011.08

Hs 2714 s

9.139.30

8.20 17%

80 sSg 267

8.20 17%

Rf 2638 s

226226Ra + Ra + 4848Ca = Ca = 269-271269-271Hs + 3-5Hs + 3-5nn

RESULTS

H s 270

8.88+- 0 .05

Sg 266360 m s+250

-100

H s 270

9.02+- 0 .08

Sg 266280 m s+190

-80

7.6 s+4.9-2.2

T U M F L N R

2 0 s

Six decay chains of 270Hs were observed at 233 MeV beam energy

1010thth International Spring Seminar on Nuclear Physics New Quests in Nuclear Structure, Vietri Sul Mare, May 21-25, 2010 International Spring Seminar on Nuclear Physics New Quests in Nuclear Structure, Vietri Sul Mare, May 21-25, 2010

3 0 3 5 4 0 4 5 5 0 5 5

E x c i t a t i o n e n e r g y ( M e V )

1

1 0

1 0 0

Cro

ss

se

cti

on

(p

b)

4 n

5 n

3 n

2 n

5 n

4 n

3 n

B B a s s

Cross section σ4n= 8.3 pb was measuredto be lower than predicted

No decay chains of 269-271Hs isotopes were observed at two other bombardingenergies of 228.5 MeV and 240.5 MeV

The upper cross section limits are σ3n < 4.2 pb and σ5n < 5.0 pb for the low and high 48Ca beam energy, respectively

F 1F 2

2

1

3 1 1 3

B h

2 8 6

2 7 4

2 7 0

6

5M t

2 7 8

R g

2 8 2

4

11 5

11 7

2 90

2 94

D b

1 0 . 2 3 M e V

T K E = 2 1 8 ( 5 ) M e V

11 7

2 97

F 1F 2

2

1

3 1 1 3

2 8 5

R g

2 8 13 8 s

11 5

11 7

2 89

2 93

E = 39 M e V*

5 e v en ts

E = 35 M e V*

1 e v en t

2 4 9 4 8B k + C a

9 .9 5 (4 0 ) M e V

4 5 m s

2 8 . 3 s

1 .3 m in

0 .7 4 s

1 1 .0 s

3 3 . 4 h

7 .4 m in

1 3 s

8 .1 s

1 .0 s

0 .0 2 3 s

1 1 2 m s

9 .6 3 (1 0 ) M e V

9 .5 6 M e V

8 .8 0 (1 0 ) M e V

8 .4 3 M e V

9 .0 0 (1 0 ) M e V

9 .4 3 M e V

9 .5 5 (1 9 ) M e V

9 .1 4 M e V

1 0 . 8 1 (1 0 ) M e V

1 1 .0 0 M e V

T K E = 2 1 9 ( 5 ) M e V

1 0 . 3 1 (9 ) M e V

1 0 . 4 8 M e V

7 .9 s

0 .3 2 s

2 1 m s

1 0 m s

0 .2 2 s

1 .2 s

9 .7 4 (8 ) M e V

9 .4 8 (1 1 ) M e V

1 1 .0 3 (8 ) M e V

1 1 .2 6 M e V

9 .9 6 M e V

11 7

2 97

1 6 s

E* = 35 MeVbeam dose = 1.7*1019

60 days

E* = 39 MeVbeam dose = 2.4*1019

70 days

22.2 mg of 249BkSix sectors, each 6 cm2, 0.31 mg/cm2

T1/2 = 320 days

black - experiment,black - experiment,blue - theoryblue - theory

Thank you

Rg112113

114

117

115

118

116

160 162 164 166 168 170 172 174 176 178 180 182 184152 158156154

BhHs

MtDs

NoMdFmEsCf150

NoMdFmEsCf

Sg

Z = 114

aaa

a

112/2859.1529 s

A/Z

T1/2

E (MeV)

EC

-

SF

aa10.02 9.94

10.84 10.74

9.54

9.30

10.00

10.4610.59

10.12

9.75

9.71

9.02

10.37

10.33

7.1 ms

32 ms 87 ms

18 ms

0.10 s

0.19 s

0.17 s

0.72 s

9.8 s

29 h

9.7 ms

0.48 s

97 ms0.82 ms

3.6 s

0.20 s

1.9 m

0.48 s 0.80 s0.13 s10.19

3.8 s

48 238 249Ca + U... Cf

8.54

9.70

18 s10.66

0.89 ms11.65

10.5461 ms

Db

LrRf

-7

-6

-5

-4

Esh=-3

10.630.07 s

10.694 ms

10.0.4 s

8.931 m

20 m 1.2 h

9.822.6 s

9.1529 s

11 s

1.3 h

Neutron number

Chart of nuclides

Prot

on n

umbe

r

14 ms11.03 10.8180 ms

10.31 9.95220 ms 16 ms

9.745.5 s 9.6320 s

26 s 9.000.5 s

9.558 s

8.8050 s

23 h